摘要
为了研究堆积多孔介质中流动沸腾换热特性，以横截面积为10mm-10mm、长100mm的铜管中充满直径为0．4～1．0mm、孔隙率为0．31-0．37的钢珠的多孔介质为对象，对水在流过此多孔介质时沸腾换热现象进行了研究，获得了流速、热流密度、粒径和加热方位等对换热性能影响的规律：随着流速的增大，沸腾换热系数增大；随着热流密度增大，沸腾换热系数降低；随着热流密度的变化，小颗粒多孔介质的壁面过热度的变化量比大颗粒多孔介质要大得多；从下表面加热比从上表面加热的壁面过热度要低，约2—3K，更有利于沸腾换热。
To investigate the performance of flow boiling in stacking porous media, experiments were conducted for water flowing across a copper tube with the area of 10 mm-10 mm, length of 100 mm. The tube was filled with the steel particles The diameter of the particles was 0.4-1.0 mm and the porosity is 0.31-0.37. The effects of the velocity, heat flux, diameter and position of heating on the heat transfer were discussed. The results showed that the boiling heat transfer coefficient increased as the inlet velocity increased and as the heat flux decreased. The variable quantity of the wall superheat degree for the small particles was much larger than the big particles as the heat flux changed. The wall superheat degree when heated from below was 2-3 K lower than from top.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第6期991-994,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点基金项目(No.50736003)
关键词
堆积多孔介质
流动沸腾
沸腾换热系数
stacking porous media
flow boiling
boiling heat transfer coefficient
