节点文献

两相流载气蒸发研究和传热数据关联

A Study of "Gas Carrying Evaporation" and Correlation of its Heat Transfer Data

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 孙长贵于志加丁洁徐维勤沈自求

【Author】 Sun Changgui, Yu Zhijia, Ding Jie, Xu Weiqin and Shen Ziqiu(Dalian University of Technology, Dalian)

【机构】 大连理工大学化学工程研究所大连理工大学化学工程研究所 辽宁大连辽宁大连

【摘要】 两相流载气蒸发是在蒸发器的垂直加热管中引入一种惰性气体,使液体的蒸发在气液两相界面上进行的过程.本文研究了载气蒸发的流型区域和传热规律,对载气蒸发的特性进行了机理分析,并以叠加模型关联了实验数据,获得了准数方程式.

【Abstract】 When the liquid is introduced into a vertical tube and heated to its boiling point, convective boiling occurs. If an inert gas is introduced at the bottom of the tube, it can be observed that the boiling vapor nuclei are not formed on the heating pipe wall and the evaporation of liquid takes place at the gas-liquid interphase instead. Such an operation is called Gas Carrying Evaporation(GCE).In this paper studied by visual observation and with an electric conductivity probe, the flow pattern transition was measured as a function of carrying gas flow rate, liquid rate and operating pressure and an empirical flow regime diagram was obtained. Moreover, the effects of various operating parameters on heat transfer in GCE were studied and the mechanism of the enhancement of heat transfer in GCE was analyzed.The following conclusions can be drawn from this study. In GCE,the heat transfer coefficient is higher than that obtained either in convective boiling or in gas-liquid two phase flow. It can be considered that there is a quick diffusion of liquid vapor at the initial instant with the result of lowering the gas-liquid interfacial temperature and enhancement of the heat transfer. The heat transfer in GCE may be considered as an overall effect of boiling, convective transfer and the enhancement by quick mass diffusion and can be correlated with dimensionless groups. The heating wall temperature will be lowered in GCE, so it can be applied to evaporation of heat-sensitive materials and to the evaporation of solutions which will form scales on the heating surface.

【基金】 国家自然科学基金资助项目
  • 【文献出处】 化工学报 ,Journal of Chemical Industry and Engineering(China) , 编辑部邮箱 ,1988年06期
  • 【被引频次】18
  • 【下载频次】104
节点文献中: 

本文链接的文献网络图示:

本文的引文网络