单侧内肋阵微通道复合热沉的流动和传热性能分析与构形设计  

Flow and Heat Transfer Performance Analysis and Constructal Design of Hybrid Microchannel Heat Sink With Single-Sided Internal Fin Array

作　　者：陆卓群 谢志辉[1] 王蓉 南刚 吴锋[4,5] LU Zhuoqun;XIE Zhihui;WANG Rong;NAN Gang;WU Feng(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China;School of Energy,Mechanical&Electronic Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China;No.710 Research&Development Institute of CSSC,Yichang 443003,China;School of Optical Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Institute of Thermal Science and Power Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]海军工程大学动力工程学院,武汉430033 [2]湖南人文科技学院能源与机电工程学院,娄底417000 [3]中国船舶重工集团有限公司第七一〇研究所,宜昌443003 [4]武汉工程大学光电信息与能源工程学院,武汉430205 [5]武汉工程大学热科学与动力工程研究所,武汉430205

出　　处：《工程热物理学报》2022年第11期2841-2851,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51979278,No.51579244,No.51506220)。

摘　　要：对单侧矩形内肋阵微通道复合热沉建立了热-流耦合模型,在约束肋片体积占比和相对位置的条件下,分别以热沉的进出口流动压降最小化、最高温度最小化和综合性能评价因子最大化为目标,对肋片高宽比和肋片间距进行了构形设计。为减小热沉流动压降,应采用矮宽型肋片,以减小离散肋片与流体的接触面积、改善通道内流速场的均匀性、削弱绕流效应和流动阻滞导致的流动损失,且发现离散肋片等差间距分布比肋片高宽比对流动压降的影响要小。为降低热沉的最高温度,应采用细长型肋片,并使离散肋片沿流向由疏到密等差布置,以使散热需求和肋片布置相匹配、增大离散肋片与流体的换热面积、增强离散肋片四周的绕流效应。为提高热沉的综合性能,应采用细长型肋片,并使离散肋片沿流向由密到疏等差布置,其最优构形的综合性能明显优于无肋微通道热沉,且综合性能评价因子最大值会随着雷诺数的增大而减小。A heat-flow coupling numerical model of hybrid microchannel heat sink with single-sided internal fin array is established. With the fixed volume ratio of fins and relative position of the fins,the constructal design is performed by taking the height-to-width ratio and the spacing distribution of fins as design variables. The minimization of the flow pressure drop between the inlet and outlet of heat sink, the minimization of the maximum temperature of heat sink, and the maximization of the comprehensive performance evaluation criteria of heat sink are taken as the objectives, respectively.In order to reduce the flow pressure drop of heat sink, short and wide fin should be applied, so as to decrease the contact area between the discrete fins and the fluid, to improve the uniformity of the flow velocity field in the channel, and to weaken the flow loss caused by the effect of flow bypass and blockage around the discrete fins, and it is found that compared with the height-to-width ratio,the equal difference sequence spacing distribution of discrete fins have less effect on the flow pressure drop. In order to reduce the maximum temperature of the heat sink, thin and long fins as well as the spacing distribution from sparse to dense of the fins along the flow direction should be applied,so as to match the heat dissipation demand with the fin arrangement, to increase the contact area between the discrete fins and the fluid, and to enhance the effect of flow bypass around the discrete fins. In order to improve the comprehensive performance evaluation criteria of the heat sink, thin and long fins as well as the spacing distribution from dense to sparse of the fins along the flow direction should be applied, the comprehensive performance of the optimal construct is significantly better than that of the finless microchannel heat sink, and the maximum comprehensive performance evaluation criteria decreases as the increase of Reynold number.

关 键 词：构形理论 电子器件冷却 微通道热沉 热设计 综合性能评价因子 

分 类 号：TK124[动力工程及工程热物理—工程热物理]