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射流冲击不同形状凸起热源的数值模拟研究
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Abstract:
冲击射流是一种换热性能突出的散热方式，被广泛应用于电子信息、航空航天、军工国防等领域。该研究以水为工质，数值模拟研究了二维层流射流冲击矩形、三角形及圆弧形凸起热源的流动与换热特性，对比研究了冲击距离(h/W)在1~10范围内，雷诺数在50~250范围内的换热规律。研究表明：体积夹带量随着雷诺数与冲击距离的增加而增加，且几乎不受凸起热源形状变化的影响。在滞止点附近，三角形凸起热源的局部换热效率极高，在冲击距离h/W = 1、Re = 50时，其最大换热系数是矩形的1.84倍，圆弧形的1.77倍。从热阻与泵功角度分析，冲击距离h/W = 1的矩形凸起热源有着最优的换热性能。该研究丰富了冲击射流强化换热理论，为解决高热流密度冷却技术提供了理论依据。
Impinging jet cooling is an outstanding heat dissipation method, which has been widely applied in the areas of electronics, aerospace, military and defense, automobile and medical industries. Using water as the working fluid, the flow and heat transfer performance of two-dimensional laminar jet impinging on rectangular, triangular and circular convex heat sources are numerically studied, and systematically evaluated with the impact distance (h/W) in the range of 1~10 and Reynolds number in the range of 50~250. The results show that the volume entrainment increases with the increase of Reynolds number and impact distance, without much affected by the convex shape. Near the stagnation point, the local heat exchange efficiency of triangular heat source is the best one. When the h/W = 1 and Re = 50, its maximum heat exchange coefficient is 1.84 times that of rectangle and 1.77 times that of circular arc, respectively. From the thermal resistance and pump power perspec-tives, the rectangular heat source with h/W = 1 shows the best performance. This study enriches the heat transfer theory of jet cooling, providing design guidelines for the cooling technology towards high heat flux.
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