4.7 Article

Deciphering the heat and mass transfer behaviors of staggered tube bundles in a closed wet cooling tower using a 3-D VOF model

期刊

APPLIED THERMAL ENGINEERING
卷 161, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.114202

关键词

Closed wet cooling tower; Staggered tube bundle; Shear force; Heat and mass transfers; VOF multiphase method

资金

  1. National Natural Science Foundation of China [51776228, 21606261]
  2. Science and Technology Planning Project of Guangzhou City, China [201704030136]

向作者/读者索取更多资源

This article presents a three-dimensional CFD model to describe the counter-current air-water flow across the staggered tube bundles in a bench-scale closed wet cooling tower by combining VOF multiphase method and SST k-omega turbulence model. The proposed model can investigate the interfacial heat-mass transfer and complex interaction mechanisms among multiple tubes. Through adding the shear force term and water evaporation in the model, the circumferential distribution of the falling film and air humidity fields are obtained, and the effects of the spray density and the air velocity on the falling film flow mode, air humidity, and transfer process are studied. The results show that, the thinnest water film and maximum evaporation rate are obtained when the circumferential angle is 75 degrees and the spray density is 0.048 kg m(-1) s(-1), respectively; the air Reynolds number has a greater influence on multiphase heat and mass transfers than that of the spray water Reynolds number.

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