文献类型：期刊文献

英文题名：Flow Characteristics of the Vertical Turbulent Falling Film at High Reynolds Numbers

作者：Wei, Zongyao[1,2];Wang, Yifei[1,2];Wu, Ziwei[1,2];Peng, Xin[1];Yu, Guangsuo[1,2];Wang, Fuchen[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai 200237, Peoples R China

年份：2021

卷号：60

期号：1

起止页码：678

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20210209764938);WOS:【SCI-EXPANDED(收录号:WOS:000611072000057)】；

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

语种：英文

外文关键词：Mass transfer - Reynolds number - Velocity - Velocity measurement - Liquid films - Ultrasonic applications

摘要：The experimental study on flow characteristics of the turbulent falling film flowing along a vertical Perspex plate was carried out using ultrasonic Doppler velocimetry (UDV, a non-intrusive technique) at 1.85 x 10(4) <= Reynolds number of the liquid film (Re-l) <= 3.69 x 10(4). The instantaneous velocity of the turbulent falling film at different Re-l was measured to investigate the velocity distribution, fluctuation range, turbulence intensity, and the flow behavior in falling films. The results showed that the increase of Re-1 reduced the length of the development region and accelerated turbulent falling films to a steady flow state. There were mainly two reasons for the change of the velocity gradient in films: the amplitude of interfacial waves and the collision of the liquid that has different velocity directions. When the falling films were away from the inlet, the mass transfer within falling films may be dominated by the lateral movement rather than Re-l.