Simulation of the hydrodynamics and mass transfer in a falling film wavy microchannel |
| |
Authors: | Siyuan Chen Tao Zhang Li Lv Yanxiao Chen Shengwei Tang |
| |
Affiliation: | Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China |
| |
Abstract: | The flow in a liquid falling film is predominantly laminar,and the liquid-side mass transfer is limited by molecular diffusion.The effective way to enhance the mass transfer is to improve the liquid film flow behavior.The falling film behaviors of water,ethanol and ethylene glycol in nine different wavy microchannels were simulated by Computational Fluid Dynamics.The simulation results show that the falling film thickness exhibits a waveform distribution resulting in a resonance phenomenon along the wavy microchannel.The fluctuation of liquid film surface increases the gas-liquid interface area,and the internal eddy flow inside the liquid film also improves the turbulence of liquid film,the gas-liquid mass transfer in falling film microchannels is intensified.Compared with flat microchannel,the CO2 absorption efficiency in water in the wavy microchannel is improved over 41%.Prediction models of liq-uid film amplitude and average liquid film thickness were established respectively. |
| |
Keywords: | Falling film Wavy microchannel CFD Mass transfer |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《中国化学工程学报》浏览原始摘要信息 |
|
点击此处可从《中国化学工程学报》下载全文 |
|