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Indexed by:期刊论文

Date of Publication:2019-07-01

Journal:DESALINATION AND WATER TREATMENT

Included Journals:SCIE

Volume:157

Page Number:1-7

ISSN No.:1944-3994

Key Words:Numerical simulation; Liquid film thickness; Liquid film velocity; Counter-current air

Abstract:A three-dimensional model is applied to simulate the spreading process and thickness distribution of the liquid film outside an elliptical horizontal tube falling-film heat exchanger. Reynolds number (Re) is 187 and the counter-current air flow rates are 0, 0.1 and 0.5 m/s, respectively. The volume of fluid method is used to trace the gas-liquid interface. It is shown that falling film flow delays and the liquid film thickness increases as the gas flow rate increases. When the counter-current gas flow rate is increased to 0.5 m/s, the falling film distribution becomes uneven and local accumulation occurs. Along the circumferential direction, the liquid film velocity increases as the gas flow rate increases.