引入固体颗粒强化膜态沸腾换热的机理分析  

ANALYSIS OF FILM BOILING HEAT TRANSFER MECHANISM FOR SOLID PARTICULATE ADULTERATE INTO COOLING FLUID

作　　者：金建国[1] 任吉堂[1] 陈连生[1] 田广志[2] 徐树成[1] 王翠苹[3] 田志强[1] 

机构地区：[1]河北理工大学,河北唐山063009 [2]唐山师范学院,河北唐山063000 [3]青岛大学,山东青岛266071

出　　处：《工程热物理学报》2006年第5期820-822,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50476084)

摘　　要：本文针对热轧棒材生产过程中穿水冷为背景,以热力学分析为基础,讨论了冷却介质中掺入固体颗粒后出现的强化沸腾换热的机理。认为固相颗粒的引入在汽化和凝结过程中形成了非均态核化中心,增加了核化几率,提高了膜内的扩散速率;固体颗粒的存在使得水膜减薄,汽泡的寿命缩短,甚至改变局部传热状态由膜态沸腾转变为核态沸腾。得出了固体颗粒携带水膜穿入蒸汽膜的必要条件是水与固体颗粒的润湿角θ<75°。This article aim at process of hot rolled rod, and is based on the thermodynamics analysis. The mechanism of boiling heat transfer was discussed, which the liquid add solid grain can strengthen boiling heat transfer is discussed. Think at the process of vaporize and coagulate the solid grain will become the nonhomogeneous nucleating center, increasing nucleate rates, raising diffusion rate in the film; The solid grain with water film breakthrough the steam film make the steam film thinning and burst, which its life is decreased. Even inflect local transmitting heat translate from film boiling to core boiling. Made sure that the prerequisite of the solid grain with water film breakthrough steam film should be the humectation angle of the water and the solid grain θ〈75°.

关 键 词：膜态沸腾 固体颗粒 核态沸腾 核化速率 润湿 

分 类 号：TK124[动力工程及工程热物理—工程热物理]