介入微泡群强化过冷池沸腾换热机理研究
Promoting Subcooled Pool Boiling Heat Transfer via Induced Microbubbles
罗鹏 1佟薇 2吴刚 2刘军 2赵玉刚1
作者信息
- 1. 上海理工大学能源与动力工程学院,上海市动力工程多相流与传热重点实验室,上海 200093
- 2. 深圳市英维克科技股份有限公司,深圳 518129
- 折叠
摘要
实验研究了介入微泡群对水的过冷池沸腾传热的影响.用微孔径泡沫钛制成气泡发生器来生成大量的微气泡冲刷加热表面以强化换热,这是首次利用外加微泡群强化过冷池沸腾换热的机理研究.通过气泡行为的可视化,发现微泡群通过气-液相变潜热传热、冲刷加热表面上存留的气泡/气膜及扰动作用来强化过冷池沸腾换热.结果表明,介入微泡群能够提高传热系数,降低初期换热温差.加热表面大倾斜角时,微泡群在高过冷度、低热流密度区域时强化换热效果最好.
Abstract
The effect of induced microbubbles on subcooled pool boiling heat transfer of water was studied experimentally.A bubble generator made of microporous titanium foam is used to generate a large number of microbubbles to flush the heated wall to enhance heat exchange.This is the first study on the mechanism of boiling heat transfer in subcooled pool using induced microbubbles.Microbubbles enhance the boiling heat transfer in the subcooled pool by providing gasification nu-cleation sites to enhance latent heat transfer,flush the bubble/film of the hot wall to promote their departure and induce disturbances in convection.The results show that adding microbubbles can increase the heat transfer coefficient and suppress the wall superheating.For inclined hot walls,the heat transfer enhancement of microbubbles perform most effectively in the region of high subcooling and low heat flux.
关键词
强化传热/相变换热/微泡群/池沸腾/过冷Key words
heat transfer enhancement/phase change heat transfer/microbubbles/pool boiling/subcooling引用本文复制引用
出版年
2024
NETL
NSTL
万方数据