文献类型：期刊文献

英文题名：Wave characteristics of the falling liquid film in the development region at high Reynolds numbers

作者：Wei, Zongyao[1];Wang, Yifei[1];Wu, Ziwei[1];Peng, Xin[1];Yu, Guangsuo[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Inst Clean Coal Technol, Shanghai 200237, Peoples R China

年份：2020

卷号：215

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20200208001457);WOS:【SCI-EXPANDED(收录号:WOS:000520029300038)】；

基金：This work was supported by the National Key R&D Program of China (2017YFB0602601), the Shanghai Engineering Research Center of Coal Gasification (18DZ2283900).

语种：英文

外文关键词：Liquid falling film; Film thickness; Statistical property; Breakup

摘要：The wave characteristics of the turbulent falling liquid film in the development region along the vertical Perspex plate were studied by using an Ultrasonic Doppler Velocimetry (a non-intrusive technique). The instantaneous thickness of the falling film at the center of the plate with axial distance ranges from 50 mm to 1300 mm was measured and the Re! (the liquid film Reynolds number) ranges from 2.28 x 10(3) to 1.43 x 10(4). The results show that the mean thickness, wave frequency and amplitude increase while the growth rate decreases with the increase of Rel. The Probability Density Function of the liquid film instantaneous thickness tends to an approximately normal distribution with increasing Rel. Furthermore, the Plateau-Rayleigh instability can cause the breakup of the liquid film surface and resist the increase of the liquid film thickness, which results in the fluctuation range of the liquid film approximate to a fixed value when the Re-1 > 1.20 x 10(4). (C) 2019 Elsevier Ltd. All rights reserved.