含不凝气体蒸汽波节管内凝结特性研究  

Study on condensation characteristics of vapor with non-condensable gas in corrugated tubes

作　　者：贾文华 田茂诚[1] 张冠敏[1] 魏民 JIA Wenhua;TIAN Maocheng;ZHANG Guanmin;WEI Min(School of Energy and Power Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学能源与动力工程学院

出　　处：《化工学报》2019年第A02期201-207,共7页CIESC Journal

基　　金：国家自然科学基金项目(51676114);山东省自然科学基金项目(ZR2016EEM26)

摘　　要：通过数值模拟,研究了波节结构、空气含量及Reynolds数Re对含空气的水蒸气波节管内凝结特性的影响,并与圆形换热管内的情况进行了对比。模拟结果表明:空气含量增加,波节管壁面平均传热系数减小;波节管内流体流动和换热过程均呈现振荡波动;波节高度增加,壁面平均传热系数先增加后降低,在波节高度0.032m达到峰值,而摩擦系数一直增加;波节间距减小,波节宽度增加,壁面平均传热系数及摩擦系数均增大;波节高度对波节管内流动和换热影响均大于波节宽度和波节间距。This paper presents a numerical investigation on the condensation characteristics of vapor with non-condensable gas in corrugated tubes. Several 2D examples with different corrugated structures, air contents and Reynolds numbers are studied and compared. Results show that along with the increase of air content, the wall average heat transfer coefficient decreases in the corrugated tube. The oscillation of fluid flow and heat transfer is generated due to the corrugated structure. With the increasing of wave height, the skin friction coefficient increased, and the wall average heat transfer coefficient first increased, and then decreased, the maximum of wall average heat transfer coefficient in this paper is in 0.032 m. The influence of wave height on the flow and heat transfer characteristics is more obvious than the width of the wave node and the space between two waves. The effect of inlet fluid flow-rate on the skin friction coefficient is also evaluated and discussed to provide some guidelines for future engineering applications.

关 键 词：数值模拟 波节管 不凝气体 管内冷凝 气液两相流 混合物 

分 类 号：TK124[动力工程及工程热物理—工程热物理]