基于真空沸腾的高热流密度散热过程的试验研究  

Experimental Study of High Flux Heat Exchange Cooled by Vaporizing at Reduced Pressure and by Water Cooling

作　　者：高文忠[1] 梁建尧 李长松[1] 吕雯[1] 

机构地区：[1]上海海事大学商船学院,上海201306

出　　处：《真空科学与技术学报》2016年第9期1004-1009,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(50976064)

摘　　要：基于液体低压沸腾过程吸收大量潜热的机理,设计并搭建利用普通冷却水驱动即可实现高热流密度散热的新型试验装置,并从过热度、蒸发压力、冷却水温等方面对热流密度及散热壁面温度的影响进行了试验测试。试验数据表明:真空中水沸腾曲线与常压下有明显区别,在过渡沸腾区呈轻微下降后快速增加;初始压力对真空沸腾特性影响显著,绝对压力越低,热流密度越大;冷却水温度对沸腾换热有影响,但不明显,通过大幅降低冷却水温度以提高沸腾换热能力不可取;冷凝能力不足可使散热迅速恶化,冷凝端设计时应考虑足够的余量,以避免极端条件下散热恶化。The high flux heat exchangeinthenovel heat sink,rapidly cooled by vaporizing of water at reduced pressure and by running water,was mathematically modeled,theoretically analyzed and experimentally simulated with a lab- built test platform. The impact of the cooling conditions,including but not limited to the vaporization temperature,reduced pressure,flow- rate and temperature of running water,on the heat- flux and temperature on the cooled surfaces was investigated. The measured results show that the property of the high heat- flux exchange depends strongly on the low pressure boiling of water,but weakly on the temperature and / or flow- rate of the running water. Low pressure significantly reduces the water boiling temperature. We suggest that poor condensation of the vaporized water may seriously damage the novel heat sink with high heat flux exchange or the cooled devices in a short period of time.

关 键 词：真空沸腾 热流密度 压力 散热 冷凝 

分 类 号：TK121[动力工程及工程热物理—工程热物理]