【作者】 范凌灏； 田茂诚； 张冠敏； 张明建；

【Author】 FAN Ling-hao;TIAN Mao-cheng;ZHANG Guan-min;ZHANG Ming-jian;School of Energy and Power Engineering,Shandong University;

【机构】 山东大学能源与动力工程学院；

【摘要】 基于连续介质假设,针对去离子水在不同截面形状的硅基矩形微通道中流动传热问题,采用变物性参数设置和数值模拟方法,研究在通道当量直径不变和通道底面宽度不变两种情况下,随着截面高宽比改变,微通道压降、表观平均Nu等参数的变化趋势,分析不同截面的矩形微通道流动传热特性,同时通过热沉底面平均温度和评价因子j/f两个参数共同考量其综合性能。结果表明,在通道当量直径不变的情况下,增大截面高宽比,微通道流动恶化,对流传热强度提升,评价因子j/f下降,热沉底面平均温度下降但趋势渐缓;当通道底面宽度不变时,增大截面高宽比,通道传热特性和热沉底面平均温度与上述情况变化趋势相同,但流动情况好转,评价因子j/f出现阶跃性增长后基本稳定不变。更多还原

【Abstract】 In this paper,based on the continuum hypothesis,the flow and heat transfer of deionized water in silicon-based rectangular micro-channels with different cross-section shapes are studied by means of variable property parameter setting and numerical simulation.Under the condition that the equivalent diameter of the channel remains unchanged and the width of the underside of the channel remains unchanged,the variation trend of the micro-channel pressure drop,the apparent mean Nu and other parameters along with the change of the section aspect ratio is analyzed.In this way,the flow heat transfer characteristics of rectangular micro-channels with different sections are explored,and their comprehensive performance is considered through the average temperature of the hot bottom surface and the evaluation factor j/f.The results show that when the equivalent diameter of the channel remains unchanged,the section aspect ratio increases,the micro-channel flow deteriorates,the convective heat transfer intensity increases,the evaluation factor j/f decreases,and the average temperature of the thermal bottom surface decreases but the trend slows down.When the width of the bottom surface of the channel remains unchanged,the aspect ratio of the section increases.The heat transfer characteristics and the average temperature of the hot bottom surface of the channel have the same change trend as above,but the flow condition improves,the evaluation factor j/f is stable and unchanged after the step growth.更多还原