蛇形管流动沸腾弯头处传热的非均匀性  

THE HEAT TRANSFER HETEROGENEITIES OF BENDS IN FLOW BOILING OF HAIRPIN TUBES

作　　者：孟勐[1] 彭晓峰[1] 

机构地区：[1]相变与界面传递现象实验室 清华大学,北京100084

出　　处：《工程热物理学报》2009年第3期498-500,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目支持(No.50636030)

摘　　要：针对蛇形管内的汽液两相流进行了可视化观测,发现弯头处相变主要发生在弯头内侧。通过对局部弯头液相的流动与换热进行数值模拟可以发现,弯头内速度场的重新分布是形成内外两侧换热非均匀性的主因,并且利用内外两侧壁面的核化条件以及温度分布对实验现象进行了分析和认识。A series of visual experiments were conducted for liquid-vapor two-phase flow in hairpin tubes, and it was observed that most of the nucleation sites located at the outer tube wall of the bend. From the simulation, it was concluded that the uneven velocity distribution in the bend induced the heat transfer heterogeneity. Furthermore, the nucleation of both inner and outer tube wall of the bend and the wall temperature distribution were discussed to understand the physical phenomena.

关 键 词：汽液两相流 温度分布 核化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]