Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 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 FilosofĂ­a, PolĂ­tica 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)
Similar Journals
Journal Cover
High Temperature
Journal Prestige (SJR): 0.455
Citation Impact (citeScore): 1
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1608-3156 - ISSN (Online) 0018-151X
Published by Springer-Verlag Homepage  [2467 journals]
  • Ignition of a Propane-Air Mixture for a Reflected Shock Wave at High
           Pressures

    • Free pre-print version: Loading...

      Abstract: Experimental data on the ignition delay times in a stoichiometric propane-air mixture have been obtained. The experiments were carried out on a shock tube in a temperature range of 1065–1595 K behind the front of the reflected shock wave at pressures of 23–33 atm. A comparison of the obtained data with the results of other measurements and the data from kinetic calculations is presented.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21010107
       
  • Phase Equilibrium and Critical Properties of the System [xH2О + (1
           – x)C7H16], x = 0.355

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      Abstract: An automated, experimental setup based on a high-temperature, adiabatic calorimeter-piezometer was used to study the temperature dependence of the isochoric-heat capacity of a double stratified system of n-heptane–water with a water content of x = 0.355 (mole fraction) in a density range of 149.9–399.8 kg/m3 at temperatures of 397.15–550.15 K. This includes the phase-transition regions and the critical region. The critical system parameters and the parameters of azeotrope formation are determined.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020085
       
  • Thermal Stability of Polymer/Organoclay Nanocomposites: Structural
           Analysis

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      Abstract: The thermal stability of polymer/organoclay nanocomposites was studied within the framework of fractal analysis. It is shown that this property is controlled by the structure of the nanofiller in the polymer matrix of the nanocomposite, which is a general postulate for other properties of polymer nanocomposites. The efficiency of a nanofiller to increase the destruction temperature is determined by its ability to generate high-modulus interfacial regions.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020061
       
  • Boiling of a Jet of Superheated Water with Outlet through a Nozzle with a
           Square Section

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      Abstract: The results of an experimental study of the dynamics of boiling of a jet of superheated water flowing from a high-pressure chamber through a short, square duct into the atmosphere are presented. The change in the jet shape is traced at various degrees of overheating. The effect of complete disintegration of the jet is established: a cone with a widened opening angle. A loss of stability of full jet opening was found at a temperature of T = 540 K. For various modes of boiling in dimensionless coordinates, the dependence of the change in the angle of the jet opening on the degree of overheating of the working fluid is obtained.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020024
       
  • Thermal Stability of C60 and C70 Fullerites

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      Abstract: The thermal properties of C60 and C70 fullerenes and fullerites have been studied by X-ray structural analysis and UV spectroscopy. It was shown that C70 fullerite is stabler than C60 fullerite (by ~150°C) due to the different geometry of the fullerenes and stronger intermolecular interactions. The experimental results are given a qualitative and quantitative interpretation based on the calculation of the interaction energy between two fullerene molecules.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020103
       
  • Study of the Electrode Erosion in Powerful, Single-Chamber, Three-Phase
           Alternating-Current Plasma Torches

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      Abstract: The paper compares two types of alternating-current (AC) plasma torches of different power and application that fundamentally differ in the design of the electrodes and operate with plasma-forming gases such as air, nitrogen, carbon dioxide, methane, hydrogen, helium, etc. The work experimentally studies the processes of the erosion of the material of the plasma torch electrodes intended for the heating of various gases (air, nitrogen, etc.) at pressures up to 8 MPa and up to average temperatures of 6000K with a thermal efficiency of 60–85%.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030111
       
  • Equation of State for a Liquid with Double Exponential Potential

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      Abstract: We propose a simple method for the approximation of the integrand in the integral representation of the free energy of a system of particles with two-particle interactions admitting a Fourier expansion, based on which the equation of state of a with a double exponential potential liquid is obtained without laborious calculations. The found temperature dependences of the equilibrium thermodynamic properties appropriately describe the corresponding experimental data. The effectiveness of the approach is demonstrated on the example of a model with double Yukawa potential.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020073
       
  • Study of Postdetonation Waves after the Counter Collision of Detonation
           Waves in a Bubble Liquid

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      Abstract: Abstract The counter interaction of detonation waves in a liquid with bubbles of a combustible gas is considered based on numerical simulation. The effect of the initial volumetric gas content of a bubbly liquid on the peak pressure values arising in the liquid upon the collision of waves is analyzed. The transformation of detonation waves into postdetonation waves and their subsequent dynamics are studied. The calculated parameters of the attenuation of postdetonation waves are compared with the experimental results.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020036
       
  • Suppression of Plasma Instabilities in the Plasma of a Three-Electrode
           Current and Voltage Stabilizer

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      Abstract: The conditions for the excitation of current and voltage oscillations in the plasma of a three-electrode current and voltage stabilizer have been experimentally studied. It was found that the oscillations are due to negative conductivity of the plasma in the considered regimes. A highly efficient method is proposed for the suppression of plasma instabilities based on the control of the sign of differential plasma conductivity via adjustment of the concentration of thermal plasma electrons with an external electrode. The proposed method makes it possible to achieve a high level of stability of the stabilizer’s energy characteristics at a discharge current density of up to 5 A/cm2 and a power of 500 W/cm2.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030081
       
  • Critical Outflow of a Vapor–Liquid Flow through a Grain Layer

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      Abstract: Based on previous experimental studies, we carried out a numerical simulation of the process of the critical outflow of a vapor–liquid flow in cylindrical channels filled with a layer of spherical particles. The process is characterized by a sharp boiling up of the liquid and a change in the thermohydraulic properties of the flow. The spherical fillings were particles 2, 4, and 8 mm in diameter, and the layer lengths were 250 and 355 mm. The effect of the material and the temperature of the filling on the intensification of vaporization and the profiles of the vapor content over the channel cross section were studied. Data were obtained on the critical flow rate, the speed of sound for various system configurations with respect to the particle diameter, the length of the layer of spherical particles, their material, and the level of the initial vapor content. The speed of sound is estimated for the gasdynamic blocking of a vapor–liquid flow, the values of which are in the region between the thermodynamically equilibrium and the frozen speeds of sound.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X2102005X
       
  • Simulation of Thermionic Thermal Protection in a Supersonic Air Flow
           around a Spherically Blunted Cone

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      Abstract: A mathematical model of a thermionic thermal protection system has been developed to study the characteristics of heat and mass transfer in a spatial, high-enthalpy air flow around a body. The effect of electron evaporation (emission) from the emitter surface on the decrease in the temperature of the composite shell of thermionic thermal protection is estimated. The effect of different angles of attack on the heat-transfer regimes in the system of multielement thermionic thermal protection is studied. Qualitative agreement of the calculation results with the known data has been obtained.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030044
       
  • Heat Transfer to Aqueous Glycol Solutions in Pulse-Superheated States

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      Abstract: In experiments on the controlled pulsed heating of a substance, the heat transfer to aqueous glycols and propylene glycols solutions was compared in the full range of compositions. The research was conducted in the field of stable and superheated states. The used mode involved the thermostabilization of a probe heater when a specified temperature was reached. The typical heating duration was 10 ms. The general feasibility of the measurement of primary quantities in aqueous solutions superheated with respect to the liquid–vapor equilibrium temperature is shown. In test experiments with an aqueous solution of PPG-425 polypropylene glycol, the measurements were carried out with short-term superheating relative to the liquid–liquid equilibrium temperature, as well as in a certain range of compositions relative to the temperature of the diffusion spinodal of the solution.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020152
       
  • Substantiation of Technology for the Growth of Monocrystalline
           Leucosapphire from Technically Pure Corundum

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      Abstract: One of the stages of the preparation of porous granular corundum prior to its use in an installation for the industrial production of monocrystalline sapphire (type NIKA-M60) is high-temperature vacuum cleaning. The characteristics of the cleaning process are evaluated with mathematical models based on solid-state diffusion and Knudsen diffusion from porous particles and through a layer of porous particles. The solid-state diffusion of impurity atoms and the Knudsen flow of impurity vapors through the granule pores are described by analytical expressions with fitting coefficients identified with the use of numerical solutions. The model of the Knudsen flow through a layer of granular powder makes it possible to take into account blowing with a neutral gas (argon) in order to intensify the process. Cleaning times on the order of several hours were obtained in the presence of argon blowing at a flow rate of 10–5 kg/(m2 s). Based on the NIKA-M60 unit, the flow rate is 7 × 10–7 kg/s or 2.5 g/h.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020115
       
  • Dynamics of Plasma in a Plasma-Microwave Amplifier under the Action of the
           Miller’s Force

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      Abstract: In this paper, we consider the dynamics of plasma in a high-power plasma-microwave amplifier with a submicrosecond pulse duration. It is shown that, in the case of a linear mode (a short system length or a small input signal level), a discontinuity in the plasma density can form near the output boundary due to the escape of particles towards the amplifier input, which can lead to radiation breakdown. When the amplifier operates in the saturation mode, the plasma displacement has a multidirectional character, and a density discontinuity is not formed. At an increase in the initial plasma density, the effect of its pushing out weakens.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21010077
       
  • Problems in Global Atmospheric Energetics of the Atmosphere

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      Abstract: Changes in the Earth’s atmosphere that affect its energetics are analyzed. The results of NASA programs on carbon dioxide monitoring in the atmosphere and the evolution of the global temperature, as well as data on measurements of the evolution of local temperature in the past, are presented. Global power processes are analyzed on the basi of contemporary information both for: natural processes and those resulting from human activity. The channels of establishment of an equilibrium between the change in the mass of atmospheric carbon dioxide and that in global temperature are considered. They include decrease of the total rate of photosynthesis as a result of deforestation, combustion of fossil fuels and the greenhouse effect. Based on current information, it is shown that none of these channels explains the observed accumulation of carbon dioxide in the atmosphere. The inconsistency of climatological models of changes in the global temperature as a result of an increase in the concentration of carbon dioxide, which are the basis of the Paris Agreements on Climate, has been demonstrated. The use of these models is based on the assumption that the spectra of carbon dioxide and water molecules do not overlap, which contradicts both the data resulting from measurements with NASA programs and calculations based on the spectroscopic parameters of molecules from the HITRAN data bank. The Pauling concept, which is based on the thermodynamic equilibrium between free atmospheric CO2 molecules in the atmosphere and bound carbon at the Earth’s surface, is presented. Based on this concept, the different nature of the past and current equilibrium is shown. Thus, in the past, the slowest process of oxidation of the bound carbon at the Earth’s surface was the evaporation of carbon dioxide molecules dissolved in the ocean, while the limiting process at present is oxidation of carbonates in the oceans.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030123
       
  • Analytical Solutions to Models of Local Nonequilibrium Heat Transfer

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      Abstract: A series of boundary-value problems of local nonequilibrium heat transfer is considered in terms of the theory of transient heat conduction for hyperbolic-type equations (wave equations). The mathematical models for the generalized equation have been studied simultaneously in Cartesian, cylindrical (radial heat flux), and spherical (central symmetry) coordinate systems. The technique to determine analytical solutions to a broad class of practically important problems of transient heat conduction for canonical bodies (plate, solid cylinder, and solid sphere) and for partially bounded bodies (half-space bounded by a flat surface and spaces with an internal cylindrical cavity and an internal spherical cavity) has been developed. The obtained, exact analytical solutions to a series of model problems can be considered as radically new results of analytical thermal physics.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21020048
       
  • Electrophysics of the Combustion of Hydrocarbon Fuel in the Liquid
           Propellant Rocket Engine Chamber

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      Abstract: A mathematical model of the generation of an intrinsic electric field in the system high-enthalpy ionized flow–nozzle wall has been developed, and numerical calculations have been carried out in relation to the chamber of a sustainer liquid-propellant rocket engine. The electrical conductivity of a weakly ionized plasma of combustion products of oxygen + kerosene fuel has been determined. Numerical calculations of the electric current to the grounded wall of the nozzle were carried out and were verified with the experimental data of other authors. It was found that the integral value of the current to the wall was 800–7500 mA at a given potential of the nozzle wall of 20–250 mV, depending on the outflow mode. The calculated values of the voltage and current can be used to diagnose the working process in a noncontact way and to build an algorithm for a next-generation engine-emergency protection system for tests at the stand.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X2103010X
       
  • Influence of the Pulse Shape on Heat Transfer at the Stagnation Point of
           an Unsteady Axisymmetric Impinging Jet

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      Abstract: A numerical study of the effect of the pulse shape (rectangular, triangular, and sinusoidal) on heat transfer at the stagnation point of a turbulent pulsed jet was carried out. It is shown that both an increase and a suppression of heat transfer are possible in a nonstationary impinging jet in comparison with a stationary jet for all studied pulse shapes. In the area of small distances between the pipe outlet cross-section and the target surface (H/D ≤ 6) in a pulsed jet, the heat transfer at the stagnation point increases with an increase in the pulse frequency, while an increase in frequency causes a decrease in heat transfer for H/D > 8. An increase in the Reynolds number leads to a decrease in the heat transfer intensification ratio, and the data for all frequencies approach the steady-state impinging jet regime. The predicted results are compared with the experimental data available in the literature. Satisfactory agreement was obtained on the effect of the shape and frequency of pulses on heat transfer at the stagnation point by the target surface.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030093
       
  • Wave Dynamics of Gas Suspensions and Individual Particles during Resonance
           Oscillations

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      Abstract: We review here the results of experimental and theoretical studies on the dynamics of gas suspensions and individual particles in wave fields of resonators of various shapes. The effects of the coagulation and sedimentation of aerosols of various natures under acoustic and shock-wave impacts, as well as the patterns of the trapping, focusing, and separation of particles in wave fields, are considered. The main forces leading to the drift of particles in the wave field, as well as the effect of acoustic streaming , are discussed.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030056
       
  • Modeling and Optimization of Properties of Domestic Mullite–Corundum
           Composites

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      Abstract: Mathematical modeling of spectral-kinetic, thermal, and electrophysical characteristics, which are difficult to determine experimentally, has been carried out based on the available experimental data for a promising class of the latest high-temperature composite materials consisting of mullite−corundum fibers. The model based on the concept of a representative element makes it possible to take into account not only the structural regularities of the materials and the thermal and electrical properties of its constituents, but also the features (in particular, anisotropy) of radiation in their volume and a wide range of external conditions. After the model is adjusted to the experimental data (thermophysical or spectral), it is possible to calculate the necessary characteristics of materials as a whole and to study the physical processes in heterogeneous, highly porous structures on different spatial and temporal scales. In this study, the model was adjusted to the published results of a thermophysical experiment, which made it possible to determine over a wide temperature range the key parameters to take into account cooperative effects when the fragments of the material interact with electromagnetic radiation. New, important data on the thermal conductivity of materials and its conductive and radiative components, heat capacity, electrical resistivity, and dielectric permittivity have been obtained. A study on those external conditions that make experimentation substantially difficult has been carried out, and specific recommendations regarding the optimization of the properties of the materials are given. The results of the work clearly demonstrate the effectiveness of mathematical materials science as a tool that significantly expands the capabilities of experimental methods.
      PubDate: 2021-03-01
      DOI: 10.1134/S0018151X21030019
       
 
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