Journal
APPLIED THERMAL ENGINEERING
Volume 161, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.114202
Keywords
Closed wet cooling tower; Staggered tube bundle; Shear force; Heat and mass transfers; VOF multiphase method
Funding
- National Natural Science Foundation of China [51776228, 21606261]
- Science and Technology Planning Project of Guangzhou City, China [201704030136]
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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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