Subjects -> PHYSICS (Total: 857 journals)
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    - THERMODYNAMICS (30 journals)

THERMODYNAMICS (30 journals)

Showing 1 - 28 of 28 Journals sorted alphabetically
Advances in Heat Transfer     Full-text available via subscription   (Followers: 27)
Applied Thermal Engineering     Hybrid Journal   (Followers: 38)
Araucaria. Revista Iberoamericana de Filosofía, Política y Humanidades     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 11)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 3)
Condensed Matter Physics     Open Access   (Followers: 2)
Diffusion Foundations     Full-text available via subscription   (Followers: 4)
European Journal of Mechanics - B/Fluids     Hybrid Journal   (Followers: 5)
Experimental Heat Transfer     Hybrid Journal   (Followers: 18)
Experimental Thermal and Fluid Science     Hybrid Journal   (Followers: 35)
Fluids     Open Access  
Heat and Mass Transfer     Hybrid Journal   (Followers: 28)
Heat Transfer Engineering     Hybrid Journal   (Followers: 38)
High Temperature     Hybrid Journal   (Followers: 2)
HTM Journal of Heat Treatment and Materials     Full-text available via subscription   (Followers: 3)
International Journal of Thermodynamics     Open Access   (Followers: 14)
International Journal of Thermophysics     Hybrid Journal   (Followers: 7)
Journal of Chemical Thermodynamics     Hybrid Journal   (Followers: 8)
Journal of Low Temperature Physics     Hybrid Journal   (Followers: 6)
Journal of Non-Newtonian Fluid Mechanics     Hybrid Journal   (Followers: 14)
Journal of Thermal Science     Hybrid Journal   (Followers: 22)
Journal of Thermal Spray Technology     Hybrid Journal   (Followers: 5)
Journal of Thermodynamics     Open Access   (Followers: 9)
Journal of Thermophysics and Heat Transfer     Hybrid Journal   (Followers: 95)
Low Temperature Physics     Hybrid Journal   (Followers: 6)
Metal Science and Heat Treatment     Hybrid Journal   (Followers: 36)
Quantitative InfraRed Thermography Journal     Hybrid Journal  
Thermophysics and Aeromechanics     Hybrid Journal   (Followers: 6)
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International Journal of Thermophysics
Journal Prestige (SJR): 0.417
Citation Impact (citeScore): 1
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-9567 - ISSN (Online) 0195-928X
Published by Springer-Verlag Homepage  [2467 journals]
  • Development and Characterization of SiC–Mo High-Temperature Multi-layer
           Laser Flash Artifacts with Partial Debonding

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      Abstract: Abstract Laser flash analysis (LFA) has long been used for thermophysical properties measurements at high temperatures for both monolayer and multi-layer materials. Although some high-temperature bulk candidate reference materials were developed and studied, e.g., in the European Metrology Research Programme (EMRP) funded Joint Research Project (JRP) ENG08 Metrofission, they were not able to meet the requirements for validating thermal measurements of multi-layer systems using LFA. In the European Metrology Programme for Innovation and Research (EMPIR) funded JRP 17IND11 Hi-TRACE project, the National Physical Laboratory (NPL) is developing multi-layer reference artifacts, including both fully bonded and partially debonded systems for validating thermal characterization of multi-layer systems at temperatures from room temperature to above 1000 °C using LFA. This paper details the methodology of production, measurement and validation of silicon carbide and molybdenum foil-based multi-layer systems with, and without, partial debonding. Reproducibility and thermal stability of the artifacts will be discussed, with recommendation on the usage criteria as LFA multi-layer reference artifacts. The multi-layer system was found to be thermally stable for at least ten thermal cycles between room temperature and 1200 °C. The interface thermal conductance of both the bonded and debonded region of the artifacts was calculated using an inverse model and was shown to remain stable with varying temperatures and over five thermal cycles.
      PubDate: 2023-01-26
       
  • Correction to: Reference Correlation for the Viscosity of Ethanol from the
           Triple Point to 620 K and Pressures Up to 102 MPa

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      PubDate: 2023-01-24
       
  • Thermodynamic Properties and Critical Behavior of Spin-Polarized Atomic
           Hydrogen (H↓) Using the Quantum Second-Virial Coefficient

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      Abstract: Abstract The quantum–mechanical formulations for the second-virial, and the acoustic virial, coefficients are derived for spin-polarized atomic hydrogen (H↓). The dependence of these coefficients on the temperature T as well as the nuclear polarization \(\zeta \;\) is analyzed. This is done for the first time. The main inputs in these computations are the scattering phase shifts, which are obtained using the Lippmann–Schwinger equation, with the Silvera triplet-state potential. Starting with these phase shifts, comprehensive calculations of the thermophysical properties for this system are performed for T ranging from 1 µK to 100 K, and \(\zeta \;\) varying from 0 to 1. These properties include, in addition to the quantum second-virial coefficient and the acoustic virial coefficient: the pressure–polarization–temperature \(\left( {P {-} \zeta {-} T} \right)\) behavior, the entropy (per atom), the speed of sound, the second-virial correction (to the total internal energy per atom and unit density), and the specific heat capacity (per atom and unit density). The Boyle temperature and the Joule inversion temperature are determined. The T-dependence of these thermophysical properties, and related quantities, is explored. As expected, this dependence is most evident in the low-T limit, where quantum effects predominate. The corresponding \(\zeta\) -dependence becomes noticeable at 80 K and below. It is observed that the virial coefficients tend to decrease with increasing \(\zeta\) . Comparison of the present results to previous results are included whenever possible. The overall agreement is very good. As T is lowered, the disruptive effects of thermal energy are weakened relative to the attractive interactions between the atoms. Consequently, the H↓ gas makes a transition to a state of higher order and lower entropy—Bose–Einstein condensation (BEC). This is explored carefully.
      PubDate: 2023-01-24
       
  • A Statistical Approach for Green Conversion of the Amorphous E-waste into
           Glassy Refractory Mortar Subjected to High Temperature

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      Abstract: Abstract The characteristics of vast dune sands in southern Algeria create the potential for exploitation in high-temperature resistance performances for refractory mortar manufacturing used in building construction. The refractory mortar examined in this work incorporates amounts of fine addition of liquid crystal display glass electronic waste (DGE-waste) in order to optimize the thermophysical and mechanical performance of the mortar and correct the granular distribution of the used sand. The aim of this paper is to study new refractory mortar products containing DGE-waste to reduce the demand for conventional mortars while providing a new sustainable waste management solution. The dune sand was partially substituted (0 %, 5 %, 10 %, 15 %, and 20 % in weight) with DGE-waste powder with a w/c ratio of 0.6. The DGE-waste powder and four of the five samples were analyzed using a scanning electron microscope (SEM). The thermophysical properties, such as thermal conductivity, were experimentally measured in dry states. These properties were determined as a function of the DGE-waste powder percentage using a high-temperature oven at different temperatures (200 °C, 400 °C, 600 °C, and 800 °C), whose mechanical behavior at high temperatures has not been extensively studied. We statistically analyzed the obtained data using one-way analysis of variance (ANOVA) with a level of significance of 0.05. The results confirm that increasing the replacement levels of additions of DGE-waste significantly improves the thermo-physical and thermo-mechanical properties of dune sand-based mortar. As a result, the results show that thermal conductivity decreases with increasing temperature and/or decreased replacement rate. Therefore, the incorporation of DGE-waste powder can significantly affect the thermophysical and thermomechanical properties as compared with the control mortar. The results revealed that a more reasonable way to find refractory dune sand mortar is by incorporating DGE-waste.
      PubDate: 2023-01-19
       
  • Phase Equilibrium (VLE) Measurements in Ternary Mixture of SC
           CO2 + (0.564 Toluene/0.436 Chloroform) Underlying the SEDS Dispersion
           Process of Immiscible Polymer Blending

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      Abstract: Abstract The results of an experimental study of the phase equilibrium (VLE) properties of CO2 in organic mixture of (0.564 toluene/0.436 chloroform) at three selected isotherms of 313.15 K, 333.15 K, and 353.15 K in the pressure range from (0.95 to 12.27) MPa, involved in the supercritical SEDS dispersion process of immiscible polymer blending, are reported in the present work. The compatibility of immiscible linear high-pressure polyethylene (HPPE)/polycarbonate (PC) polymer blends with organic toluene + chloroform solvent in the presence of supercritical carbon dioxide (SC CO2) was studied. The PC and LHPPE polymers blending have been carried out in the pressure range from (8 to 25) MPa at temperatures between (313.15 and 353.15) K using the supercritical SEDS method. The kinetics of crystallization and phase transformation in polymer blends obtained by the melt blending (mixed in the molten state) and the supercritical SEDS methods have been studied using DSC technique. The thermodynamic characteristics such as (temperature, \(t_{{{\text{fus}}}}\) , and enthalpy of fusion, \(\Delta_{{{\text{fus}}}} H\) ) of the produced LHPPE/PC polymer blends are presented. The influence of the supercritical SEDS dispersion process parameters on the heat of fusion of the obtained LHPPE/PC polymer blends has been studied. The compatibility of LHPPE/PC blends was confirmed by studying the DSC melting-crystallization curve properties and investigating the morphology. The morphology of the LHPPE/PC polymer blends was examined using a scanning electron microscope (SEM) and the particle sizes depending on the operating temperature and pressure were studied.
      PubDate: 2023-01-19
       
  • Measurements of the Dissociation Heats of Tetrabutylammonium Acetate and
           Tetrabutylammonium Hydroxide Ionic Semiclathrate Hydrates

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      Abstract: Abstract Ionic semiclathrate hydrates mainly consist of water typically together with tetrabutylammonium and tetrabutylphosphonium salts. Since ionic semiclathrate hydrates have the large dissociation heat under ambient pressure and temperature conditions, various ionic semiclathrate hydrates have been studied as safety and eco-friendly phase change materials. In this study, tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates were proposed as thermal energy storage media for air conditioning and cooling lithium-ion batteries. The dissociation heat, which was a significant thermophysical property to design thermal energy storage systems, were measured at various mass fractions. The largest dissociation heats of tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates were 212.9 ± 0.9 kJ⋅kg−1 and 200.4 ± 2.2 kJ⋅kg−1. As a result of the comparison of the dissociation heats of tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates with those of other ionic semiclathrate hydrates, it was found that tetrabutylammonium acetate hydrates and tetrabutylammonium hydroxide hydrates had the promising thermophysical properties as thermal energy storage media for air conditioning and cooling lithium-ion batteries, respectively.
      PubDate: 2023-01-19
       
  • Measurements and Derivation of the Spray Simulation Required Physical
           Properties of Polyoxymethylene Dimethyl Ethers (PODEn)

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      Abstract: Abstract Polyoxymethylene dimethyl ethers (abbreviated as PODEn or OMEn) is a type of e-fuel with the structure CH3O(CH2O)nCH3. The carbon neutrality throughout its life cycle makes PODEn an attractive alternative to fossil fuels. Burning PODEn instead of fossil fuel can significantly reduce carbon monoxide, carbon dioxide, hydrocarbon, and especially particulate matter emissions. The heat capacity, surface tension, thermal conductivity, latent heat of vaporization, density, viscosity, and vapor pressure from room temperature to the critical point of a fuel are required for its spray simulations. In this study, for PODEn with 1 ≤ n ≤ 6, the isobaric heat capacity, surface tension, and thermal conductivity were measured with the sapphire method, pendant drop method, and transient plane source method, respectively, around room temperature and at atmospheric pressure. Furthermore, relevant calculation methods extended all the physical properties mentioned above from 298.15 K to the critical points. The calculation results were verified against and regressed with the experimental data obtained from previous literature or the experiments conducted in this study. The results of this study can greatly reduce the uncertainty in the PODEn spray simulations due to the absence of physical property data.
      PubDate: 2023-01-19
       
  • Development, Thermal Properties, and Reliability Testing of Eutectic
           Polyethylene Glycol as Phase Change Materials for Thermal Energy Storage
           Applications

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      Abstract: Abstract The present work outlines the development of eutectic phase change material in different mass fraction ratio and determining its thermal properties. The eutectic mixture was prepared by using polyethylene glycol (PEG) of atomic weight 10 000 and 6000. The eutectic was prepared by using single-step stirring and blending methods. Phase transition temperature and fusion latent heat were evaluated by differential scanning calorimetry (DSC) technique. The variation in chemical composition of the eutectics was analyzed by using Fourier transform infrared spectroscopy (FT-IR) analysis. The sample was prepared in the mass fraction ratio difference of 10%. The result shows that the sample containing PEG 6000 and PEG 10 000 in the ratio of 60:40 possesses maximum latent heat of fusion which is 194.52 J·g−1. In order to know the durability of the eutectic PCM, acceleration thermal melt/freeze cycles test in an in-house designed cycle tester was carried out for 1500 cycles. The stability of the eutectic was evaluated by thermal gravimetric analysis (TGA) analysis. These findings reveal that the variation in latent heat of fusion is not more than 15% and the chemical properties does not show any changes in the function group after 1500 cycles. The comparison result suggests that the prepared eutectic PCMs can be a probable candidate in medium-temperature range for solar-based energy storage applications.
      PubDate: 2023-01-12
       
  • Reference Correlation for the Viscosity of Ethanol from the Triple Point
           to 620 K and Pressures Up to 102 MPa

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      Abstract: Abstract We present a wide-ranging correlation expressed in terms of temperature and density for the viscosity of ethanol based on critically evaluated experimental data. The correlation is designed to be used with an existing equation of state from the triple point (159 K) to 620 K and at pressures up to 102 MPa. Comparisons with experimental data indicate the estimated uncertainty of the correlation is 4.2 % (at the 95 % confidence level) for the liquid and supercritical phase at pressures up to 102 MPa, and 2 % in the gas phase. Furthermore, for calculating viscosity values at 0.1 MPa, an additional correlation is proposed, valid from the triple point to the boiling point with an estimated uncertainty of 2.3 % (at the 95 % confidence level).
      PubDate: 2023-01-12
       
  • CFD Study on Influence of O2/CO2, O2/H2O Atmospheres and Shape of Furnace
           on Methane MILD Combustion

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      Abstract: Abstract In this study, CFD modeling of a combustion system with internal gas circulation technology was carried out for a cylindrical chamber with 0.33 m height and a 0.025 m radius in which feed enters from a nozzle with 0.003 m diameter. The simulation implements the DRM-22 chemical mechanism, modified kє turbulence model, and EDC combustion model. The effect of chamber shape and diameter, nitrogen and carbon dioxide concentration of the input feed in MILD combustion was evaluated. The results indicated that by changing the combustion chamber shape from cylindrical to convergent, the temperature contour is more uniform and CO mass fraction at the output of the combustion chamber decreases. The maximum temperature for 901.4 Nml·min−1 methane and 9148 Nml·min−1 for divergent, cylindrical, and convergent cone chambers are 1820 K, 1663 K, and 1655 K, respectively. By increasing the radius of the combustion chamber, the temperature distribution becomes more uniform due to increasing the return flow, and the maximum temperature and CO emission at the chamber outlet decrease. By decreasing the nitrogen concentration on the input feed and increasing H2O and CO2 concentration, the temperature profile becomes more uniform so that the maximum temperature in the case without nitrogen (with 0.37 carbon dioxide and water vapor mass fraction) is 1510 K, while for a case with a 0.75 nitrogen mass fraction (without carbon dioxide and water vapor) is 1630 K. The results show that increasing H2O percentage and decreasing CO2 percentage causes temperature uniformity and CO mass fraction decreasing at the chamber outlet.
      PubDate: 2023-01-10
       
  • High-Pressure Densities and Derived Thermodynamic Properties of
           Cyclopentane/n-Octane Mixtures from 293.15 K to 363.15 K

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      Abstract: Abstract Alkane mixtures are important chemicals used in different fields. The pρTx data of the mixtures are essential for the establishment of the equation of state. In this work, the liquid densities of cyclopentane/n-octane mixtures at temperatures from 293.15 K to 363.15 K and at pressures up to 70 MPa were reported for the first time. The measurements were carried out using the experimental system based on the vibrating tube method. The combined expanded uncertainty for the present density measurement was evaluated to be less than 0.8 kg·m−3. Experimental density data of the cyclopentane/n-octane mixtures were fitted as the modified Tammann–Tait equation. The derived thermodynamic properties including isothermal compressibility (kT) and thermal expansivity (αp) were determined from the modified Tammann–Tait equation, and the results were analyzed. In addition, the PC-SAFT equation combined with Berthelot–Lorentz mixing rule was used to predict the densities of the mixtures, and the results show that the PC-SAFT equation can give good results for cyclopentane/n-octane mixtures when the binary interaction coefficient set to zero.
      PubDate: 2023-01-09
       
  • Surface Tensions for Binary Mixtures of Alkyl Levulinate + Alkanol:
           Measurement and Modeling

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      Abstract: Abstract The surface tensions of binary mixtures alkyl levulinate (methyl levulinate and ethyl levulinate) + n-alkanols (methanol, ethanol, 1-propanol, and 1-butanol) at several temperatures (283.15 K, 298.15 K, and 313.15 K) and at atmospheric pressure were reported. For each binary mixture, the surface tension deviations were obtained and correlated with composition by using the Redlich–Kister polynomial expansion. These surface tension deviations vary from positive values for methanol to negative ones for 1-butanol. Regarding the behavior of surface tension deviation with alkyl levulinate, ethyl levulinate presents higher positive values or less negative ones than methyl levulinate. The computation of the surface tension was obtained with the linear square gradient theory plus the Peng–Robinson–Stryjek–Vera (PRSV-EoS). Phase equilibria for all the mixtures were predicted, because \(k_{12} = 0\) was set. Then, the densities of the homogeneous phases were obtained and used in the calculation of the surface tension, which was obtained according to two approaches, i.e., prediction and fitted, and using values constant and correlations for the parameters for both approaches. The predictive approach was not adequate because a high global deviation was obtained (3.97 %), while two adjustable parameters for the mixture in LSGT improved the representation of the variation of experimental surface tension with temperature (deviation = 1.08 %). Therefore, the simplified version of square gradient theory named LSGT guarantees good results of fitting the experimental data.
      PubDate: 2023-01-02
       
  • Determination of Refractive Index and Birefringence of Nanoparticle-Doped
           Liquid Crystals

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      Abstract: Abstract The purpose of this article is to investigate the effect of adding nanoparticles on the birefringence of nanoparticle-doped liquid crystals. The approach of this study is based on an analysis of liquid crystals doped with two different types of nanoparticles, viz Fe2O3 and ZnO. The wavelength and temperature-dependent behaviour of the nanoparticle-doped liquid crystal solution were investigated to obtain ordinary, extraordinary and average refractive indices. The paper also presents a comparative study of the indices of refraction, birefringence, order parameter and molecular polarizabilities of the samples obtained experimentally and using the theoretical model. The results indicate that the properties of the sample doped with nanoparticles show an improvement in the birefringence and polarizability ratio value with varying temperatures. The values of Cauchy’s constants, material constant, thermal variation of birefringence, order parameter and constants involved in the thermal variation of average refractive index are computed for later application and use. Samples of liquid crystals doped with Fe2O3 nanoparticles showed a higher increase in birefringence than samples doped with ZnO at all temperatures, suggesting strong molecular interactions and greater applicability. The observed result may be attributed to the stabilization of liquid crystal matrix due to the presence of nanoparticles in the molecules.
      PubDate: 2023-01-02
       
  • Thermodynamic Properties and Equation of State for Solid and Liquid Copper

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      Abstract: Abstract High-temperature equations of state for solid and liquid copper were constructed herein using experimental data on thermodynamic properties, thermal expansion, compressibility, bulk modulus and sound velocity measurements, supplemented with phase diagram data (melting curve). The totality of experimental data were optimized using the temperature-dependent Tait equation over a pressure range of up to 1000 kbar and over a temperature range from 20 K to the melting point for solid copper and to 3900 K for liquid copper. The temperature-dependence of thermodynamic and thermophysical parameters was described by an expanded Einstein model. The resultant equations of state describe well the entire set of experimental data within measurement errors of individual parameters.
      PubDate: 2023-01-02
       
  • The Thermodynamic Properties of Non-Associating and Associating Fluids: A
           Systematic Evaluation of SAFT-Type Equations of State

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      Abstract: Abstract Statistical Associating Fluid Theory (SAFT) equations of state (EoSs) have been extensively used for estimating thermodynamic properties of fluids. However, the predicted performance of SAFT-type EoSs for associating and non-associating fluids under the same thermodynamic conditions is poorly understood. In this work, four typical SAFT-type EoSs including the CPA, CK-SAFT, PC-SAFT, and SAFT-VR Mie EoSs are mainly employed and then a systematic evaluation is performed for the phase equilibria and derivative properties of the common non-associating (alkanes and carbon dioxide) and associating fluids (methanol and water). The results show that the misdescription of the residual Helmholtz free energy by SAFT-type EoSs is the major cause for the prediction accuracy of vapor–liquid equilibria (VLE). SAFT-VR Mie outperforms the others when predicting VLE of all the considered compounds, especially in conditions near the critical point, with an average absolute relative deviation (AARD) below 0.5%. PC-SAFT provides satisfactory enthalpy of vaporization (ΔHv) predictions of alkanes, but its performance is inferior to PR due to the inaccurate description of the liquid-phase ∂A/∂T derivatives. Adopting a reasonable association scheme or including the ΔHv experimental data into the parameter regression routine can effectively improve the predictions accuracy of ΔHv for associating fluids. Overall, SAFT-VR Mie performs the best performance in correlating isobaric heat capacity (CP) due to the improved description of the ∂2A/∂V∂T and ∂2A/∂V2 derivatives. Re-optimizing the universal constants of the dispersion term or employing higher-order perturbations can effectively improve the CP predictions.
      PubDate: 2023-01-02
       
  • Surface Tension of Ethylene Glycol-Based Nanofluids Containing Three Types
           of Oxides: Zinc Oxide (ZnO), Magnesium Oxide (MgO) and Indium Oxide (In
           $$_2$$ O $$_3$$ )

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      Abstract: Abstract The paper presents the results of an experimental study of the density and surface tension of ethylene glycol-based nanofluids containing zinc oxide, magnesium oxide and indium oxide. Du Noüy ring method was employed to determine the values of the surface tension of these nanofluids. Samples were prepared in various mass fractions from 0.01 to 0.05 with 0.01 step. Examination was performed in the temperature range from 283.15 K up to 318.15 K. The averaged surface tension values for the studied ZnO14-EG, ZnO25-EG, MgO-EG, In \(_2\) O \(_3\) -EG nanofluids at 298.15 K are 48.685, 48.471, 48.335, and 48.462 mN·m \(^{-1}\) , respectively. It was presented that surface tension value could be consider as constant within the examined mass fraction of the particles, and the explanation of such behaviour was provided.
      PubDate: 2023-01-02
       
  • Molecular-Specific Imaging of Tissue with Photo-Thermal Optical Coherence
           Tomography

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      Abstract: Abstract Photo-thermal optical coherence tomography (PT-OCT) is a functional extension of conventional OCT with the ability to generate maps of light absorption co-registered with the micron resolution structural tomograms of OCT. Potentially, signal analysis of such light absorption maps can be used to obtain refined depth-resolved insight into the chemical composition of tissue. Such analysis, however, is complex because the underlying physics of PT-OCT is multifactorial. That is, aside from tissue chemical composition, optical, thermal, and mechanical properties of tissue affect PT-OCT signals; certain system/instrumentation parameters also influence PT-OCT signals. As such, obtaining refined depth-resolved insight into tissue chemical composition requires in-depth understanding of the interplay between sample and system parameters and the induced signals. Moreover, translation of PT-OCT to clinics requires introduction of new experimentation strategies for enhancing the detection specificity and imaging speed of PT-OCT. In this review paper, we present and discuss our recent works aimed at addressing the above theoretical and technological challenges.
      PubDate: 2023-01-02
       
  • Study on Flow and Heat Transfer Performance of Molten Salt Based
           Nanofluids in Shell and Twisted Tube Heat Exchanger with Shutter Baffle

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      Abstract: Abstract Molten salt as heat transfer and thermal storage medium is wildly used in concentrating solar power plant (CSP). At present, the traditional shell-and-tube heat exchanger is commonly used in CSP. So far, the research on shutter baffle heat exchanger with twisted tube (SBHX-TT) of molten salt based nanofluids is relatively few. In this work, the flow and heat transfer characteristics of molten salt based nanofluids in SBHX-TT with different geometric parameters are studied. The heat transfer coefficient, pressure drop, comprehensive evaluation index and synergistic field are comparetively analyzed. The results show that when Re is between 3487 and 20,924, the convective heat transfer coefficient increases with the decrease of the inclination angle and the ratio of baffle pitch to grille sheet width (Y), the pressure drop also concurrently increases. When Y = 4, the baffle inclination angle is 30°, the convective heat transfer maximally increases by 104.4% and the pressure drop increases by 174.2% compared with that without baffle. Through response surface analysis, the obtained highest comprehensive evaluation index is 1.51, when the grille sheet inclination angle is 36° and baffle pitch to grille sheet width is 5.
      PubDate: 2022-12-28
       
  • Correction: Vapor Pressure of Supercooled Water

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      PubDate: 2022-12-26
       
  • Thermophysical Properties of Ionic Semiclathrate Hydrate Formed with
           Tetrabutylphosphonium Malonate

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      Abstract: Abstract Ionic semiclathrate hydrate is a crystalline compound mainly composed of water, which can dissociate at ordinary pressure and temperature. Ionic semiclathrate hydrates have been widely studied to develop prospective green and safety phase change materials utilized in a thermal energy storage system to cool batteries, in air conditioning, and in a cold chain system. The thermophysical properties, such as equilibrium temperature and dissociation heat, and the mass fraction dependence of such properties need to be carefully investigated to design such systems. In this study, the equilibrium temperature and the dissociation heat of tetrabutylphosphonium malonate ionic semiclathrate hydrates were experimentally determined at various mass fractions through an established method: the maximum value of the dissociation heat was 179.70 kJ·kg−1 at w = 0.357 and the equilibrium temperature was 8.9 °C at w = 0.357. By comparing tetrabutylphosphonium malonate ionic semiclathrate hydrates with other media in terms of the measured equilibrium temperature and the dissociation heat, the usability of the hydrates as thermal energy storage media for general air conditioning was discussed.
      PubDate: 2022-12-15
       
 
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