Numerical study of the falling film thickness around the tube bundle with different spacings between spray holes and tubes under tilt and sloshing conditions
Numerical study of the falling film thickness around the tube bundle with different spacings between spray holes and tubes under tilt and sloshing conditions
复制标题
倾斜和晃动条件下不同喷孔与管间距的管束周围降膜厚度数值研究
DOI：
10.1016/j.ijheatmasstransfer.2019.04.063
复制
发表时间：
2019-08
影响因子：
5.2
通讯作者：
Sun Chongzheng
中科院分区：
文献类型：
--
作者：
Han Hui;Wang Shaowei;He Ting;Li Yuxing;Sun Chongzheng
降膜的壳侧流动形态和液膜厚度(δ)分布对螺旋缠绕换热器的综合性能至关重要。本文采用流体体积法进行了三维数值模拟，研究了管内流动模式和δ在管内的分布特征。首先，研究了不同喷雾密度、纵向管间间距(ST)和喷孔布置(Sh)对δ分布的影响，确定了合适的喷雾密度和喷孔布置方式。然后，根据所选择的几何参数，考察了倾角和晃动条件的影响。结果表明，虽然Sh的大小对稳定区δ的波动范围有显著影响，但稳定区的平均δ可以保持在相同的水平。对于喷孔布置，SH值的减小不会使稳定区的δ变厚，但对δ较厚的峰区的轴向长度扩展有46%的促进作用。倾斜条件显著恶化了管间流动模式的转变，使得柱状流更容易转变为板状流。在横摇运动下，在原主峰附近出现次峰带，其δ比原主峰带薄30%~40%。
The shell-side flow patterns and liquid film thickness (δ) distribution of the falling film are extremely important for the comprehensive performance of the spiral-wound heat exchangers. In this paper, 3-D simulations calculated with volume of fluid (VOF) method are performed to study the inter-tube flow modes and the distribution characteristics ofδaround the tube. At first, the effects of different spray densities, longitudinal inter-tube spacings (St) and spray holes arrangements (Sh) on theδdistribution are studied to determine the appropriate values. After that, the influence of tilt and sloshing conditions are examined based on the selected geometric parameters. The results show that although the value ofSthas a significant influence on the fluctuation range ofδin stable zone, the averageδin stable zone could remain in the same level. For the spray holes arrangement, the decrease ofShdoes not thicken theδin stable zone but promotes a 46% axial length expansion for the crest zone with a thickerδ. The tilt conditions significantly deteriorate the inter-tube flow modes transitions, which makes the column flow much easier convert to sheet flow. Under roll motion, a secondary crest zone emerges nearby the original main crest zone and itsδis 30%–40% thinner than that of the original main crest zone.
登录
查看更多内容
DOI：
10.1016/j.ijrefrig.2017.08.006
发表时间：
2017-12
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
--
作者：
Chao Ding;Haitao Hu;G. Ding;Jie Chen;X. Mi;Sicong Yu;Liu Jianrui
通讯作者：
Chao Ding;Haitao Hu;G. Ding;Jie Chen;X. Mi;Sicong Yu;Liu Jianrui
水平管上层流降膜的滴流和喷射模式的流动行为
DOI：
10.1016/j.ijheatmasstransfer.2018.03.111
发表时间：
2018-09
影响因子：
5.2
作者：
Ding Hongbing;Xie Peng;Ingham Derek;Ma Lin;Pourkashanian Mohamed
通讯作者：
Pourkashanian Mohamed
DOI：
10.1016/j.ijheatmasstransfer.2015.09.043
发表时间：
2016-02
影响因子：
5.2
作者：
C. Qi;Houjun Feng;Hong-qing Lv;C. Miao
通讯作者：
C. Qi;Houjun Feng;Hong-qing Lv;C. Miao
DOI：
10.1016/j.ijrefrig.2009.02.008
发表时间：
2009-06
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
--
作者：
V. Subramaniam;S. Garimella
通讯作者：
V. Subramaniam;S. Garimella
影响因子：
3.2
作者：
Binglu Ruan;A. Jacobi;Lian-sheng Li
通讯作者：
Binglu Ruan;A. Jacobi;Lian-sheng Li