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Two-phase heat and mass transfer of phase change materials in thermal management systems

机译:热管理系统中相变材料的两相传热和传质

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This paper experimentally and numerically studies the solid-liquid heat transfer mechanism of octadecane which is a phase change material (PCM) with the melting temperature of 28 ℃ in thermal management systems. This study finds that the convective heat transfer driven by the buoyancy force could be dominant during the melting of pure PCM: the time to melt 30 mm of PCM decreases from 453 min to 13 min when the heating direction changes from downwards to upwards. The use of porous materials such as metal foams (made from Cu, Al or C) with various porosities and pore sizes in the thermal management system significantly increases the overall heat transfer rate due to the increase of effective conductivity. The amount of heat absorption within 60 min significantly increases from 105.6 kJ to 248.9 kJ after using the Al foam with 0.97 porosity. Further decreasing the porosity to 0.925 and 0.88, however, will decrease the amount of absorbed heat to 230.7 kJ and 179.7 kJ because of the decrease of natural convection and the decrease of overall heat capacity. Considering the increase of weight and cost of the thermal management system by using porous materials, the Al foam (compared with C and Cu foams) with the porosity of 0.97 (compared with 0.88 and 0.925) and the pore size of 5.08 mm (compared with 0.64 mm, 1.27 mm, 2.54 mm) is preferred within the porous materials investigated by this study.
机译:本文通过实验和数值研究十八烷的固液传热机理,十八烷是一种相变材料,在热管理系统中的熔点为28℃。这项研究发现,在纯PCM的熔化过程中,由浮力驱动的对流传热可能占主导地位:当加热方向从向下变化到向上时,熔化30 mm PCM的时间从453分钟减少到13分钟。在热管理系统中,使用具有不同孔隙率和孔径的多孔材料,例如金属泡沫(由Cu,Al或C制成),由于有效电导率的提高,显着提高了总体传热速率。使用孔隙率为0.97的铝泡沫后,在60分钟内的吸热量从105.6 kJ显着增加到248.9 kJ。然而,由于自然对流的减少和总热容量的减少,将孔隙率进一步降低到0.925和0.88会使吸收的热量减少到230.7 kJ和179.7 kJ。考虑到通过使用多孔材料增加了热管理系统的重量和成本,泡沫铝的孔隙度为0.97(与0.88和0.925相比)(与C和Cu泡沫相比),孔径为5.08 mm(与在这项研究研究的多孔材料中,最好使用0.64 mm,1.27 mm,2.54 mm)。

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