Numerical simulation analysis of heat and mass transfer of saline wastewater in a falling film evaporation tube based on different inlet modes

Falling film evaporation technology is widely used in the treatment of salt-containing wastewater in coal chemical industry. However, there is still a lack of research on the inlet method of vertical falling film evaporation tubes. In this paper, the heat and mass transfer processes of saline wastew...

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Bibliographic Details
Published in:Water science and technology 2023-05, Vol.87 (9), p.2128-2141
Main Authors: Kong, Xiang Cheng, Liu, You Le, Li, Hua Shan, Xue, Jian Liang, Liu, Bing, Cheng, Dong Le, Gao, Yu, Xiao, Xin Feng
Format: Article
Language:English
Subjects:
Accidental Falls
Bays
Chemical industry
Coal industry
Efficiency
Energy
Evaporation
Falling
falling film evaporation
Flow velocity
Fluid flow
Heat transfer
High temperature
Hot Temperature
Inlets
Inlets (waterways)
Liquid membranes
mass and heat transfer
Mass transfer
Mathematical models
pure water
saline wastewater
Simulation
Simulation analysis
Temperature
Tubes
Turbulence
Turbulence models
vertical tube
Viscosity
Wastewater
Wastewater treatment
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Summary:Falling film evaporation technology is widely used in the treatment of salt-containing wastewater in coal chemical industry. However, there is still a lack of research on the inlet method of vertical falling film evaporation tubes. In this paper, the heat and mass transfer processes of saline wastewater under vertical and tangential inlets were investigated using numerical simulations. On this basis, the differences in flow and heat transfer processes between saline wastewater and pure water under tangential inlet were investigated. The results showed that the flow velocity of saline wastewater with a falling film evaporation tube in a tangential inlet mode was larger. Meanwhile, the turbulence in this way was more intense and the fluid temperature in the vertical tube was higher. Saline wastewater has higher temperature and smaller liquid volume fraction than pure water liquid membrane in the range of 193-1,000 mm from the inlet. The use of tangential inlet method to treat salt-containing wastewater has higher evaporation efficiency and is a very effective way to guide the improvement of heat transfer efficiency.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2023.130