以多孔介质泡沫铜复合石蜡相变材料作为研究对象,采用ANSYS-Fluent中的凝固/熔化模型,相变材料的密度采用Boussinesq假设,多孔介质区选择non-equilibrium模式,对三维长方体蓄热腔内复合相变材料的蓄热过程进行数值模拟,分析多孔介质的填充度和孔隙率对相变蓄热特性的影响。结果表明,当孔隙率不变时,同一时刻多孔介质填充度越高则蓄热腔内液相率越大、蓄热率越快、多孔介质区域温度传递越快,但Nu越小,同时,随着多孔介质填充度的增加,蓄热量逐渐越小。当填充度不变时,在蓄热初期,孔隙率越小则蓄热腔内液相率越高、温度传递越快、蓄热量越大、蓄热率越快、Nu越小;在蓄热中后期,孔隙率越小则蓄热腔内液相率越小、温度传递越慢、蓄热量越大、蓄热率越快、Nu越大。在该文数值模拟范围内,长方体蓄热腔的最优多孔介质泡沫铜填充度为1,孔隙率为0.65。
Abstract
Taking the porous medium copper foam composite paraffin phase change material as the research object, using the solidification/melting model in ANSYS-Fluent, the density of the phase change material is based on the Boussinesq hypothesis, and the non-equilibrium model is selected in the porous medium area. The heat storage process of the composite phase change material in the three-dimensional rectangular heat storage cavity is numerically simulated, and the effects of the filling degree and porosity of the porous medium on the phase change heat storage characteristics are analyzed.The results show that when the porosity is constant, the higher the filling degree of the porous medium, the larger the liquid phase rate in the heat storage chamber, the faster the heat storage rate, the faster the temperature transfer in the porous medium area, but the smaller the Nu. At the same time, with the increase of the filling degree of the porous medium, the heat storage capacity gradually decreases. When the filling degree is constant, in the early stage of heat storage, the smaller the porosity, the higher the liquid phase rate in the heat storage chamber, the faster the temperature transfer, the greater the heat storage, the faster the heat storage rate, and the smaller the Nu. in the middle and late stages of heat storage, the smaller the porosity, the smaller the liquid phase rate in the
关键词
相变 /
多孔介质 /
数值模拟 /
填充度 /
孔隙率
Key words
phase change /
porous medium /
numerical simulation /
degree of filling /
porosity
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基金
国家自然科学基金（51706058）; 河北省自然科学基金（E2019208345）
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