过冷沸腾近壁面温度和速度分布特性研究
Investigation on Characteristics of Temperature and Velocity Distribution Near Wall on Subcooled Boiling
徐铃淼 1李晓 1刘洪涛 1唐继国1
作者信息
- 1. 水力学与山区河流开发保护国家重点实验室,四川大学水利水电学院,成都 610065
- 折叠
摘要
本文对25～40 K过冷度下核态沸腾和气泡微细化沸腾时近壁面液体温度和速度分布进行了实验研究.结果表明:在核态沸腾区域,加热面附近液体热量通过气泡生长、脱离和浮升带离;高温区主要集中在加热面上方.在MEB区域,无气泡脱离发生,近壁面液体热量通过气膜剧烈振荡引入的对流过程向远端传递,以维持局部过冷度;此时加热面上方和边缘区域液体平均温度比远端液体温度约高4K,且随时间剧烈波动.上述结果表明,核态沸腾和MEB时近壁面热量输运过程存在显著差异.
Abstract
The temperature distribution of near-wall liquid in nuclear boiling and microbubble emission boiling(MEB)with liquid subcooling covering 25～40 K are experimentally investigated.The results show that in the nuclear boiling region,the liquid heat near the heating surface is carried away by bubble growth,detachment and buoyance,with the high temperature zone near the wall is mainly concentrated above the heating surface.In MEB region,no bubble detachment occurs,and the liquid heat near the wall is transferred to the bulk through the convective process induced by the vigorous oscillations of the vapor film to maintain the local subcooling.The average liquid temperature above and on the edge of the heating surface is about 4 K higher than that of the bulk liquid,with intense fluctuations over time.The above results indicate that there are significant differences in heat transfer processes near the wall between nucleate boiling and MEB.
关键词
过冷沸腾/微细化沸腾/温度分布/气泡行为Key words
subcooled boiling/microbubble emission boiling/temperature distribution/bubble behavior引用本文复制引用
基金项目
国家自然科学基金资助项目(52076144)
国家自然科学基金资助项目(51706149)
四川省科技计划(2021YJ0374)
出版年
2024
NETL
NSTL
万方数据