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The heat transfer coefficients (HTC) on the surface of a copper disk sample during a quenching operation have been studied here. The sample is made very small so that the lumped mass approach can be applied for the measurements. Lumped heat capacitance is one of the technique, which is advantageous due to its simplicity, but it is an approximate technique to determine the HTCs, as this method assumes...
Annular thermosyphon or ATS was made from three concentric tubes with difference in diameter. An annular passage lying between an inner tube and a middle tube was evacuated and filled in with working fluid; therefore, a function of this annular passage was identical to that of the passage inside of ordinary thermosyphons. In order to assess possibility to apply the ATS on practical heat transferring...
For the numerical simulation of the hypersonic vehicle aerothermal heating, the grid-dependency of the aerothermal computation under the hypersonic flow was studied by the means of computational fluid dynamic. By employed two-dimensional cylinder model, researched the influence of the grid-reynolds number Recell to heat transfer simulation, and established the connection between grid refinement in...
Numerical analysis of convective heat transfer process was conducted to accurately describe the energy balance of the airfoil ice protection area. The convective heat transfer coefficient around the leading edge was calculated using four different turbulent models, including the Spalart-Allmaras model, the k-ε model, the k-ω model, and the transition SST model. Results were compared with icing tunnel...
Numerical simulation have been undertaken to investigate the forced convention heat transfer of carbon dioxide flow over the Mars rover under the Martian conditions. The study is carried out based on a simplified Mars rover model which is a cuboid with longer and wider top surface and it is performed under the conditions of temperature 160 K and 290 K, Reynolds numbers of 6.64×103 to 7.01×104 and...
A V-pattern folded core sandwich panel packed with low-density insulation material is introduced to perform as an integrated thermal protection system (ITPS). Heat transfer and linear static analyses are conducted to obtain the temperature distribution, stress and deflection responses. A preliminary thermal-mechanical optimization process is also presented. A modified form of the rule of mixtures...
A study on fuel temperature in the fuel tank for aircraft has been performed in case of both ground static non-operating and in flight transient conditions. The calculation was done by an explicit method using modified Dufort-Frankel scheme. For this calculation, it was assumed that the non-operating vehicle on ground is subjected to repeating daily cycles of ambient temperature with solar radiation...
The purpose of this research paper is to investigate the effect of surface roughness on heat transfer. This was achieved by investigating the heat transfer in two cases: a smooth, horizontal surface (the baseline case) and the same surface with a roughness element added to it. The roughness elements took the shape of hemispherical pin-fin. The roughness element was further investigated by varying...
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