Influence of Drainage and Tilt on Heat Transfer Performance of Array Pulsating Cold End Heat Pipe

Abstract

To meet the heat dissipation of a horizontally mounted chip with high heat flow density, a new type of array pulsating cold end heat pipe was proposed, which consists of a T-shaped hot end and an array pulsating cold end. The special structure is available to drain the hot end of the heat pipe, and the installation method of the cold end has an important influence on heat transfer. For this reason, a detailed experimental study of heat transfer performance was carried out in this paper. It is found that: there is a capillary lifting force at the cold end interface, which prevents the condensate returning to the hot end

therefore, the hot end has to be drained

the drainage methods are divided into hot-end liquid drainage and hot-end capillary drainage, the latter is significantly better than the former

for liquid drainage, the appropriate increase of the filling rate can improve the drainage effect

according to the cold end installation method of the new heat pipe, it can be divided into two kinds of inclined heat pipe and vertical heat pipe, the heat transfer performance of both heat pipes are quite excellent, of which the inclined heat pipe has slightly better drainage and heat transfer performance than the vertical heat pipe, but the gap between the two gradually becomes smaller with the increase of power. Under the same operating conditions, the average temperature of the heat source of the inclined heat pipe with capillary drainage is lower than that of the aluminum fin radiator by 5.79%−10.78%, and the decreasing amplitude increases with the increase of the heating power.