铜珠堆积表面高碳醇溶液池沸腾特性研究  

Pool Boiling Characteristics of High-Carbon-Number Alcohol Solutions on Packed-Copper-Bead Surface

作　　者：李伟[1] 周乐平[1] 杜小泽[1] 杨勇平[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院暨电站设备状态监测与控制教育部重点实验室

出　　处：《工程热物理学报》2017年第12期2651-2657,共7页Journal of Engineering Thermophysics

基　　金：国家自然基金资助项目(No.91634115)

摘　　要：本文针对铜珠堆积表面,研究高碳醇水溶液浓度ω、铜珠直径φ和铜珠层数N对气泡行为和沸腾传热曲线的影响。结果表明,对于水,达到一定铜珠层数后气泡生长通道基本被阻隔;对于溶液,存在气泡井喷现象。对于水,N=1时存在临界直径可极大强化传热;N=4～7时沸腾曲线整体趋势一致且比N=1时明显偏左.对于溶液,N=2时沸腾曲线偏左于水且随ω增加而总体偏左;N=3时,若孔隙率渐变大,沸腾曲线偏右于水,但差异较小.随热流密度增加,溶液甚至出现传热恶化现象。The effects of mass fraction （ω）, and diameter （φ） and layer number （N） of copper beads on pool boiling heat transfer characteristics of high-carbon-number alcohol solutions over packed-copper-bead surface were studied. It shows that the bubble growth for water can be hindered when the layer numbers of copper beads reach a certain value, while for the solutions there exists the bubble blowout phenomenon. For water, there exists a critical diameter at which the boiling heat transfer can be optimally enhanced when N=I; and the boiling curves are basically the same but obviously left-shifted when N=4-7. For the solutions, the boiling curves shift left as compared to water when N=2, and the left-shift intensifies as w increases; while, with gradient porosity, the boiling curves shift right as compared to water when N=3, although the deviations are small. The boiling heat transfer of the solutions can be even deteriorates with increasing heat flux.

关 键 词：多孔通道 高碳醇溶液 汽泡行为 沸腾曲线 

分 类 号：O647[理学—物理化学]