泡沫铜对石蜡强化传热机理的实验和模拟研究  

Experimental research and numerical simulation on the enhanced heat transfer mechanism of foamed copper to paraffin

作　　者：朱孟帅 王子龙[1] 齐和乐 孙向昕 周翔[3] ZHU Mengshuai;WANG Zilong;QI Hele;SUN Xiangxin;ZHOU Xiang(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School ofEnergy and Power Engineering, University of Shanghai for Sciences and Technology, Shanghai 200093, China;Danfoss (Shanghai) Investment Co., Ltd., Shanghai 200233, China;School of Mechanical and Energy Engineering, Tongji University, Shanghai 201804, China)

机构地区：[1]上海理工大学能源与动力工程学院,上海市动力工程多相流与传热重点实验室,上海200093 [2]丹佛斯(上海)投资有限公司,上海200233 [3]同济大学机械与能源工程学院,上海201804

出　　处：《功能材料》2021年第11期11195-11201,共7页Journal of Functional Materials

基　　金：国家自然科学基金面上资助项目(51876130);上海市自然科学基金资助项目(20ZR1438600);上海市教委青年东方学者资助项目(1018301008);上海市浦江人才计划资助项目(18PJ1408900);上海市“科技创新行动计划”生物医药科技支撑专项资助项目(21S31900200)。

摘　　要：为探究石蜡融化时泡沫铜的填充对其内部传热的影响,设计并搭建了一套可视化蓄能实验装置。分析了泡沫铜填充率对石蜡相变过程的强化传热机理,并建立其传热数学模型,利用fluent软件对石蜡融化的相变传热过程进行数值计算。实验和模拟结果表明,当泡沫铜的填充率从0%增大到1.28%时,复合相变蓄热材料的融化时间从901 s缩短到830 s,较纯石蜡减少了7.88%,液化速率和蓄热速率较纯石蜡分别提高了7.11%和10.54%,而当泡沫铜填充率为1.28%时,石蜡内部温度梯度最小,为9.1 K。泡沫铜的填充强化了石蜡的导热强度,但一定程度上削弱了石蜡内部的自然对流传热强度,且泡沫铜填充率越大,对自然对流的抑制效果越明显。此外,当泡沫铜填充率为0.72%时,蓄能装置中石蜡的蓄热量为20537.88 J,蓄热速率为24.07 J/s,复合相变蓄热材料的蓄热性能较好。In order to explore the influence of the filling of copper metal foam on the internal heat transfer when paraffin wax is melted,the effect of the copper metal foam proportion on heat transfer enhancement in the melting process of phase change material is analyzed using visualisation heat storage experimental equipment,and its Mathematical model of heat transfer is established using fluent software to perform numerical calculation on the phase change heat transfer process of paraffin melting.Experimental and simulation results show that as the copper metal foam proportion increases from 0%to 2.13%,the melting time of the composite phase-change heat storage material decreases from 901 s to 830 s,which is 7.88%less than pure paraffin wax,and the rate of liquefaction rate and the heat storage rate compared with pure paraffin is increased by 7.11%and 10.54%,respectively.The minimum temperature gradient of 9.1 K is reached when the copper metal foam proportion is 1.28%.The copper metal foam proportion strengthens the thermal conductivity of paraffin wax,but weakens the natural convection heat transfer strength inside the wax.The greater copper metal foam proportion,the more obvious the restraining effect on natural convection.In addition,the best heat storage and heat storage rate for copper metal foam composite phase change materials are 20537.88 J and 24.07 J/s,respectively,achieved with a copper metal foam proportion of 0.72%.

关 键 词：相变蓄热 泡沫金属 自然对流 强化传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]