振动平板上降膜流动换热特性

摘要为强化平板降膜换热效率，运用VOF模型和动网格方法的耦合技术，编写UDF函数，建立了振动平板上降膜流动换热计算模型。考虑了表面张力和壁面接触角对液膜流动的影响，研究了不同参数对降膜换热的影响，计算结果表明：振动使得平板上的液膜剧烈波动，强化了液膜传热传质效果；随着振幅和频率的增大，液膜换热效果提高，当频率和振幅同时增大时，换热效果明显提高，在研究的参数范围内，当频率f=50 Hz，振幅A=2.0 mm时，相比于无振动平板降膜，换热效果提高了27%。

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	杨立
	蒋斌

关键词：动网格振动数值模拟传热

Abstract： In order to enhance the heat transfer of falling film of the plate, the coupling technology of VOF and dynamic mesh is used, and the UDF function was made up, the model of the calculation of flow and heat transfer of the falling film on the vibration plate was established. As for considering the effects of surface tension and contact angle of wall to flow of liquid film, heat transfer of the falling film affected by different parameters was studied and analyzed. The results show that vibration makes the liquid film fluctuate violently and enhances the heat and mass transfer of the liquid film. What's more, with the increase of amplitude and frequency, heat transfer of the liquid film is improved. When the frequency and amplitude increase simultaneously, the heat transfer effect is enhanced obviously. Within the parameters of the study, when frequency f=50 Hz and amplitude A=2.0 mm, the heat transfer is 27% higher than that of the non-vibrating plate falling film.

Keywords： dynamic mesh； vibration； numerical simulation； heat transfer

Received 2018-05-06;

Fund:四川省教育厅项目（11zd1109）。

Corresponding Authors: 蒋斌,E-mail:jiangbinustc@163.com。 Email: jiangbinustc@163.com

About author: 杨立(1993-),男,硕士研究生,研究方向为换热器及传热传质。

引用本文:

杨立, 蒋斌.振动平板上降膜流动换热特性[J]. 化学工业与工程, 2019,36(4): 58-61

Yang Li, Jiang Bin.Flow and Heat Transfer Characteristics of Falling Film on the Vibration Plate[J]. Chemcial Industry and Engineering, 2019,36(4): 58-61

[1] Wunder F, Enders S, Semiat R. Numerical simulation of heat transfer in a horizontal falling film evaporator of multiple-effect distillation[J]. Desalination, 2017, 401:206-229
[2] Huang X, Yang Y, Hu P. Experimental study of falling film evaporation in large scale rectangular channel[J]. Annals of Nuclear Energy, 2015, 76:237-242
[3] 刘梅, 宋朝匣, 吴正人, 等. 非平整倾斜表面上流动液膜的影响因素分析[J]. 化工进展, 2015, 34(1):75-79, 112 Liu Mei, Song Zhaoxia, Wu Zhengren, et al. Analysis on flow film over uneven and inclined wall[J]. Chemical Industry and Engineering Progress, 2015, 34(1):75-79, 112(in Chinese)
[4] Gu F, Liu C, Yuan X, et al. CFD simulation of liquid film flow on inclined plates[J]. Chemical Engineering & Technology, 2004, 27(10):1099-1104
[5] Ishikawa H, Ookawara S, Yoshikawa S. A study of wavy falling film flow on micro-baffled plate[J]. Chemical Engineering Science, 2016, 149:104-116
[6] Fu W, Tong B. Numerical investigation of heat transfer from a heated oscillating cylinder in a cross flow[J]. International Journal of Heat and Mass Transfer, 2002, 45(14):3033-3043
[7] 申江, 邹国文, 王建民, 等. 机械振动强化吸收式制冷传热传质的实验研究[J]. 制冷学报, 2016, 37(2):46-52 Shen Jiang, Zou Guowen, Wang Jianmin,et al. Experimental study of heat and mass transfer enhancement of absorption refrigeration by mechanical vibration[J]. Journal of Refrigeration, 2016, 37(2):46-52(in Chinese)
[8] Chun K R, A Seban R. Heat transfer to evaporating liquid film[J]. International Journal of Heat Mass Transfer, 1971, 93(3):391-396
[9] 叶学民. 壁面薄膜流的热质传递和稳定性研究[D]. 北京:华北电力大学, 2002 Ye Xuemin. Investigation on heat and mass transfer and low stability of a thin liquid film draining down a wall[D]. Beijing:North China Electric Power University, 2002(in Chinese)