负压式平板型环路热管试验

为解决高热流密度电子器件的散热问题，设计了一套负压式铜 甲醇环路热管，其蒸发器设计成平板型。研究表明，该平板型环路热管具有较高的散热能力，能够在无重力姿态和重力姿态下顺利启动。当重力倾角分别为0°、18°和30°，热负荷为160W时，蒸发器壁面温度分别达到85.8℃、66.3℃和64.6℃。按照环路热管启动状态，其启动过程可分为3个阶段：加热阶段、预启动阶段和后启动阶段。在低热负荷区域，环路热管会出现温度波动现象。增大重力倾角，有利于降低蒸发器壁面温度和热阻。当重力倾角为30°，热负荷从10W递增到160W时，环路热管的热阻从4.97℃/W降低到0.39℃/W。

Experimental Investigation of a Negative-pressure Loop Heat Pipe with a Flat Plate Evaporator

A negative pressure copper methanol loop heat pipe （LHP） with a flat plate evaporator was designed for solving the heat dissipation problem of electronic devices with high heat flux. The investigation indicates that this LHP has high capacity of heat dissipation, which is able to start up with or without gravity assistance. When head load is 160W, the evaporator wall temperatures, are 85.8 °C, 66.3 °C and 64.6 °C at three gravity tilt angles of 0°, 18° and 30° respectively. The whole start period of the LHP is divided into three stages,including heat stage, pre start up stage and after start up stage. At low heat load period, the temperature oscillation phenomenon of the LHP occurs. With the gravity tilt angle increasing, both the evaporator wall temperature and the thermal resistance decrease. At the gravity tilt angle of 30° and heat load in the range from 10W to 160W, the LHP thermal resistance lies between 4.97 °C/W and 0.39 °C/W.