壁面接触角对降膜流动的影响
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- 英文论文题名：INFLUENCE OF CONTACT ANGLE ON FALLING FILM FLOW
- 论文作者：林仕 ; 李学来
- 英文论文作者：Lin Shi ; Li Xuelai ; School of Chemical Engineering ; Fuzhou University
- 年：2016
- 作者机构：福州大学石油化工学院;
- 论文关键词：二维 ; 单管 ; 降膜 ; 接触角 ; 模拟
- 英文论文关键词：Two-dimensional ; Single tube ; Falling film ; Contact angle ; Simulation
- 会议召开时间：2016-11-29
- 会议录名称：福建省科协2016年学术年会分会场——福建省制冷学会2016年学术年会论文集
- 语种：中文
- 分类号：TK172
- 学会代码：FJZL
- 会议名称：福建省科协2016年学术年会分会场——福建省制冷学会2016年学术年会
- 会议地点：中国福建泉州
- 主办单位：福建省制冷学会
- 学会名称：福建省制冷学会
- 页数：6
- 文件大小：713k
- 原文格式：O
- 会议级别：地方
摘要
本文对二维单管降膜的纯流动进行数值模拟,研究了壁面接触角对液膜环向厚度分布的影响,并得出结论:随着壁面液固接触角的增大,管壁液膜湿润度越来越小;随着液固接触角的增大,首次湿润管底的时间越长;随着液固接触角的增大,整个区域内的最大压降大致呈线性关系;当接触角低于90,接触角的大小对环向液膜厚度的影响可忽略不计。
Falling film flow without heating on single tube was investigated with numerical simulation in thispaper.The law of drop liquid film forming and the friendship between contact angle of liquid solid wall and thickness distribution were found.In summing up it may be stated that:(1) with the increase of the contact angle of liquid solid wall,the wetted area is more and more small.(2) The bigger contact angle will delays time of first arriving at tube bottom.(3) The increament of liquid-solid contact angle makes the maximum pressure drop increases.(4) the change of contact angle will not affect the distribution of liquid film,when the contact angle is less than 90.When the contact angle is 90,the effect of thickness of liquid film is negligible contact angle.
Falling film flow without heating on single tube was investigated with numerical simulation in thispaper.The law of drop liquid film forming and the friendship between contact angle of liquid solid wall and thickness distribution were found.In summing up it may be stated that:(1) with the increase of the contact angle of liquid solid wall,the wetted area is more and more small.(2) The bigger contact angle will delays time of first arriving at tube bottom.(3) The increament of liquid-solid contact angle makes the maximum pressure drop increases.(4) the change of contact angle will not affect the distribution of liquid film,when the contact angle is less than 90.When the contact angle is 90,the effect of thickness of liquid film is negligible contact angle.
引文
[1]Ribatski G,Jacobi A M.Falling-Film Evaporation on Horizontal Tubes—a Critical Review[J].International Journal of Refrigeration.2005,28(5):635-653.
[2]邵雪,杨春光,张宁.制冷系统水平管降膜蒸发器换热性能的影响因素分析[J].节能,2010,(1:4-7.
[3]候淳.水平管降膜卧式蒸发器液体分布器结构设计及流量计算[J].企业科技与应用,2012,(22):8-10.
[4]张宁,邵雪.水平管降膜蒸发器中不同形式的布液器对内部流场流动影响的数值模拟[J].节能.2012,(5):19-24.
[5]Li Xu*,Murong Ge,Shichang Wang,Yuxin Wang.Heat-transfer film coefficients of falling film horizontal tube evaporators[J].Desalination.2004,166:223-230.
[6]路慧霞,马晓建.水平管外降膜蒸发的传热实验[J].化工进展,2009,28(2):203-205.
[7]沈胜强,梁刚涛,龚路远.水平管降膜蒸发器传热系数空间分布[J].化工学报,2011,62(12):3381-3385.
[8]齐春华,李炎,俞永江.水平管降膜蒸发海水淡化的传热试验研究[J].化学工业与工程,2011,28(5):1-14.
[2]邵雪,杨春光,张宁.制冷系统水平管降膜蒸发器换热性能的影响因素分析[J].节能,2010,(1:4-7.
[3]候淳.水平管降膜卧式蒸发器液体分布器结构设计及流量计算[J].企业科技与应用,2012,(22):8-10.
[4]张宁,邵雪.水平管降膜蒸发器中不同形式的布液器对内部流场流动影响的数值模拟[J].节能.2012,(5):19-24.
[5]Li Xu*,Murong Ge,Shichang Wang,Yuxin Wang.Heat-transfer film coefficients of falling film horizontal tube evaporators[J].Desalination.2004,166:223-230.
[6]路慧霞,马晓建.水平管外降膜蒸发的传热实验[J].化工进展,2009,28(2):203-205.
[7]沈胜强,梁刚涛,龚路远.水平管降膜蒸发器传热系数空间分布[J].化工学报,2011,62(12):3381-3385.
[8]齐春华,李炎,俞永江.水平管降膜蒸发海水淡化的传热试验研究[J].化学工业与工程,2011,28(5):1-14.