波纹管内R113降膜流动特性的结构影响研究  

Study on the influence of the corrugated pipe structure on the flow characteristics of R113 falling fime

作　　者：王为术[1] 马自强[1] 王涛[1] 李振 许鹏[1] 

机构地区：[1]华北水利水电大学热能工程研究中心,郑州450045

出　　处：《低温与超导》2017年第12期84-90,共7页Cryogenics and Superconductivity

基　　金：华北水利水电大学2016年创新项目(YK2016-06)

摘　　要：为设计适用于有机工质余热发电降膜蒸发装置,采用FLUENT VOF法建立了气-液两相逆流流动CFD模型,对氟利昂(R113)波纹管内气液两相逆流降膜进行数值模拟,研究了管长、波峰、波间距对波纹管内降膜流动的影响。研究结果表明:在一定喷淋密度下,液膜稳定性随波纹管长的增大而降低,液膜的波动性随波纹管长的增大而增强,当管长小于某个值时,液膜沿壁面均匀分布,存在最佳管长;波间距越大,液膜波动越强,增加波间距能够增加液膜稳定性;波峰越大,液膜沿管长方向的变化越剧烈,减小波动幅度可以增加液膜均匀性。A gas - liquid two - phase counter - current flow CFD model was established to design suitable for organic refrigerant falling film evaporation device, based on fluent software by using the VOF method. Numerical simulation of gas - liquid two -phase flow falling film in a bellow was carried out with Freon （R113 ）. The effects of tube length, peak size and corrugation spacing on failing film flow in pipe were studied. The results show that the stability of liquid films decreases with the increasing of corrugated tube length and the volatility of liquid film increases with the increasing of bellows length in the spray density. When the length is less than a certain value, the liquid film is uniformly distributed along the wall. There is the best tube length. The larger the wave spacing, the stronger the fluetuation of the liquid film, and the increase of the wave spacing can increase the liquid film stability. The crest is bigger, the film changes along the length of the tube is fiercer, volatility decreases can improve the uniformity of liquid film.

关 键 词：降膜流动 数值模拟 R113 

分 类 号：TB651[一般工业技术—制冷工程]