Effect of pore density of metal foam on phase change heat transfer enhancement mechanism of paraffin wax
To investigate the influence of pore density of metal foam on the flow and heat transfer characteristics of phase change material(PCM)during the melting process,a semi-cylindrical visual heat storage device was designed and constructed by experiment,and the influence mechanisms of pore density on thermal characteristics,including temperature distribution,solid-liquid phase interface,and heat transfer coefficient,were analyzed.The findings reveal that the inclusion of copper metal foam(CMF)can enhance the temperature response rate of paraffin wax,reduce the melting time,and decrease the internal temperature gradient of PCM.Specifically,the temperature gradients of the pure paraffin wax and the copper metal foam with three kinds of pore densities after adding 0.20,0.59,0.98 mm-1 after complete melting of PCM are 35.26,12.19,20.49,28.39 K,respectively.Additionally,the proportion of natural convection heat transfer decreases with the increase in the pore density of CMF.For a heating power of 30 W,the natural convection proportions of 0.20,0.59,0.98 mm-1 CMF composite PCM are 20.72%,19.33%,18.24%,respectively,and all proportions are less than 50%,indicating that the heat transfer mechanism in the CMF composite PCM at a filling rate of 1.28%is dominated by heat conduction.The research results can provide a reference for the design of phase change energy storage system.
metal foampore densityphase change energy storageheat transfer enhancement
万方数据
维普
