Publisher: Multiscience   (Total: 2 journals)   [Sort alphabetically]

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Intl. J. of Aerospace Innovations     Full-text available via subscription   (Followers: 24)
Intl. J. of Multiphysics     Open Access   (SJR: 0.227, CiteScore: 0)
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International Journal of Multiphysics
Journal Prestige (SJR): 0.227
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1750-9548 - ISSN (Online) 2048-3961
Published by Multiscience Homepage  [2 journals]
  • Phenomena of Liquid Nitrogen Flashing under Rapid Depressurizations

    • Authors: T Watanabe, A Nakano, K Kambara, K Tokunaga, T Shiigi, K Shimojima
      Pages: 223 - 233
      Abstract: Flashing Experiment of liquid nitrogen in a pressure vessel was conducted under rapid depressurization rate. Observations of the explosive boiling behavior caused by quick opening of a electro-magnetic valve were undertaken by using a video camera. Pressure and temperature changes in the vessel were measured. Depressurization rates in these experiments fell in the range from 0.01 to 4.0MPa/s. Experimental results showed that the initial temperature distributions and depressurization rates have more intrinsic influence on these flashing phenomena. Relationship between pressure undershoot and depressurization rate was obtained. The rate of pressure recovery was found to increase with the rate of depressurization, which also resulted in the increase of the increment of pressure recovery. The empirical equation proposed by Alamgir and Lienhard was applied to predicted the recovery pressure of the flashing of liquid nitrogen. To obtain more precise prediction of the pressure recovery, another factor such as an orifice diameter that affects the discharge condition of the recovery pressure.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.223
      Issue No: Vol. 16, No. 3 (2022)
  • Thermal Transfer Study of a Non-Newtonian Nanofluid Behavior in a

    • Authors: K Azri, E Mezaache, M Mecili
      Pages: 235 - 259
      Abstract: In this study, laminar flow forced convection heat transfer of a non-Newtonian nanofluid flowing inside a Micro conduit that is subjected to a constant wall temperature was investigated. By considering the effect of viscous dissipation. The effects of Brinkman numbers (Br), power low index (n) and nanoparticle concentrations (φ) on the developing temperature fields and the local Nusselt number were examined. The obtained results were validated with available solutions for the special cases of conventional fluids (φ = 0) and non-viscous dissipation effect (Br = 0). Bulk temperature distribution and local Nusselt number are presented graphically for Br = 0, 0.5, 1, -0.5 and 1 for non-Newtonian fluids described by the power-law model with the flow index n = 0.3, 1.0 and 3.0. The Nusselt numbers of nanofluids were obtained for different Al2O3 nanoparticle concentrations as well as various Brinkman numbers.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.235
      Issue No: Vol. 16, No. 3 (2022)
  • Study on forming control and penetration performance of tantalum in linear
           explosively formed penetrators (LEFP) warhead

    • Authors: H Deng, G Li, Z Liang, X Ren, H Guo
      Pages: 261 - 272
      Abstract: In order to further improve the penetration power of the multi-explosive formed warhead, tantalum is used to design a multi-explosive folded warhead. Firstly, using numerical simulation, the design parameters of the damage element of two different forming methods are obtained. Then the formation process, flight process, and penetration process of the projectile were calculated, respectively. Finally, the static explosion experiment of the warhead was carried out. The results show that the calculated results are in good agreement with the experimental results. There was no break during the formation of the penetrator. It can be folded to form a rod-shaped penetrating body with a high aspect ratio, which can penetrate a Q235 steel target with a thickness of 30mm at a distance of 3 meters. Tantalum material is used as a shaped charge liner, which has a much higher penetration power and stronger aftereffect than copper and pure iron.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.261
      Issue No: Vol. 16, No. 3 (2022)
  • Nano technology building insulation effect on the thermal behavior of
           building under different Algerian weather

    • Authors: O Sotehi, L Maifi, H Belili, I Djebaili
      Pages: 273 - 286
      Abstract: The energy consumption of the building sector in Algeria represents the largest part of the energy produced in the country. Action to reduce the impact of this sector on the economy and the environment must be taken. The use of thermal insulation to reduce the energy needs of the building sector represents an effective and sustainable solution. The objective of our work is to conduct a study using the TRNSYS 17 software on the influence of the use of thermal insulation in different climates in Algeria. A typical apartment is chosen to run the calculations under three different climates of Algeria. The simulation results obtained for the city of Annaba show that the use of rock wool, cork, expanded polystyrene and airgel insulation allows a reduction of 42.81%, 43.08%, 43.31% and 50.90% respectively. While for the city of Setif the reduction obtained is 34.15%, 34.70%, 35.13% and 52.25% respectively for the same insulation. For the city of Biskra the reduction is 32.07%, 32.28%, 32.45% and 38.72% respectively for the same insulation. The improvement of the thermal performance of the structure and the glazed surfaces according to the Passivhaus standard allows a significant reduction of heating and air conditioning needs estimated at 72, 78.21 and 65.21% respectively for the cities of Annaba, Setif and Biskra. A low energy consumption building is obtained for the city of Annaba and Setif.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.273
      Issue No: Vol. 16, No. 3 (2022)
  • Design and analysis of a tethered-glider for generating
           electrical-renewable energy using the pumping cycle method

    • Authors: Z Saboohi, N Karimi
      Pages: 287 - 298
      Abstract: The issue of energy generation from wind is considered one of the main ways to develop renewed energy in some areas worldwide. The important point in generating energy from wind is the permanent wind availability, which is called the existence of effective wind. According to studies, there is no effective wind at ground level in many areas of the world, while this wind is available at altitude. The Accessibility of wind in altitude has led to the development of various technologies in energy production from airborne systems. In this research, airborne wind energy systems technologies have been investigated, and a tethered-glider was designed and analyzed using analytical methods for energy generation at a 200-meter altitude. The main factor in designing a glider is the optimal ratio of lift to drag coefficient; For calculating lift to drag coefficient, the vortex lattice method (VLC) is used in this paper. The results illustrate that a glider with a wingspan of 5.2 meters can produce a maximum of 10 kilowatts of energy over one cycle. Increasing this ratio can increase energy production efficiency.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.287
      Issue No: Vol. 16, No. 3 (2022)
  • Effect of neutral activator on properties of steel slag powder-cement
           composite cementitious material

    • Authors: J Yi, D Cai, J Xiao, Z Shi, Z Li, C Wu
      Pages: 299 - 315
      Abstract: In this paper, the physical and mechanical properties of TISCO steel slag were tested by composite activators with different ratios. The optimal neutral composite activator was determined, and the properties of neutral activated steel slag power-cement composite cementitious material with 30% cement content were studied. The experimental results indicated that the best ratio of gypsum: silica fume: sodium sulfate: sodium aluminate: self-made activator was 2.5:2.5:1:0.5. By XRD, SEM and TG-DTG detection, it was found that the less stable periclase reduced in 30% cement content and activated steel slag slurry. After 28d curing, the micro morphology and compactness of hydration products were not different from that of cement, even no incompletely hydrated particles. The voids between hydration products and the interface of different hydration products were continuously filled with hydration products over age. C-S-H and AFt generated by 7d activated SSP cement composite powder was greater than that of cement. At 28d, a small amount of Ca(OH)2 was generated. The results show that the combination of self-made neutral activator and other activators can improve the properties of cement steel slag powder composite cementitious material and improve the utilization rate of steel slag.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.299
      Issue No: Vol. 16, No. 3 (2022)
  • Finite Element Analysis to determine the impact of Infill density on
           Mechanical Properties of 3D Printed Materials

    • Authors: Z Andleeb, H Khawaja, K Andersen, M Moatamedi
      Pages: 317 - 335
      Abstract: Additive manufacturing (AM) is the process in which objects are created through the layer-by-layer deposition of material that is controlled by a computer. The infill is the internal structure of the 3D printed model. It determines the strength, weight, cost, time, and overall quality of the part. Ranging from simple lines to more complex geometric shapes, infill patterns can affect a part's performance. This study aims to conduct a Numerical Analysis for cross pattern infills with various infill densities of 0%, 10%, 19, 28%, 64%, and 100%. CAD models were developed, and FEA Analysis was performed to compare the deformation and Von Mises stresses produced by a cuboid structure under 1 MPa compressional load. Linear Isotropic Material with Young's Modulus of  70 GPA and the Poisson ratio of 0.3 was used, and quarter symmetry was applied to reduce the mesh size. The results revealed that the increasing infill percentage decreases the deformation and Von Mises stresses produced in a body under compression loading. This study helps to determine optimal infill density for maximizing strength and minimizing the weight of the 3D printed part.
      PubDate: 2022-09-29
      DOI: 10.21152/1750-9548.16.3.317
      Issue No: Vol. 16, No. 3 (2022)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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