文献类型：期刊文献

中文题名：液相黏度对上升气流中液滴夹带和破裂的影响

英文题名：Effect of Liquid Viscosity on Droplet Entrainment and Breakup in Updraft

作者：王雨帆[1];徐旻凡[1];赵辉[1];李伟锋[1];许建良[1];刘海峰[1]

机构：[1]华东理工大学上海煤气化工程技术研究中心,上海200237

年份：2023

卷号：44

期号：9

起止页码：2445

中文期刊名：工程热物理学报

外文期刊名：Journal of Engineering Thermophysics

收录：CSTPCD;;EI(收录号：20233914799396);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：国家自然科学基金(No.U21B2088)。

语种：中文

中文关键词：上升气流;黏度;液滴夹带;破裂;行为模式;多相流

外文关键词：updraft;viscosity;drop entrainment;breakup;behavior mode;multiphase flow

摘要：为了研究喷淋塔等设备内液滴的夹带特性,使用高速摄像机研究了黏度变化对上升气流中不同直径液滴变形和破裂的影响。实验结果表明:不同黏度液滴在上升气流中均会出现下落、反向夹带和破裂夹带三种行为模式。获得了不同黏度液滴破裂夹带时的特征时间和临界破裂高度,发现临界破裂高度会随液滴直径的增大而呈线性增长。通过受力分析揭示了三种行为模式的产生机理,提出了基于液滴形状和曳力系数修正的气动力和重力之比Nf,并通过黏度修正获得了临界韦伯数之比Wef。以无因次数Nf和Wef为参数建立了上升气流中不同黏度液滴的行为模式图,研究结果可为喷淋塔等设备的设计优化提供参考。
To study the entrainment characteristics of drops in spray tower and other equipment,the effect of viscosity on the deformation and breakup of drops with different diameters in updraft was studied by using a high-speed camera.The results show that there are three behavior modes named falling,reverse entrainment,and breakup entrainment of drops with different viscosities in updraft.The characteristic time and critical breakup height of drops with different viscosities were obtained in the breakup entrainment mode.It is found that the critical breakup height linear increases with the increase of drop diameter.The generation mechanism of three behavior modes is revealed through force analysis.The ratio N of aerodynamic force and gravity based on correction of drop shape and drag coefficient is proposed.The critical Weber number Wer is obtained through the correction of viscosity.Taking the dimensionless number N and Wef as parameters,the pattern of behavior modes of drops with different viscosities in updraft is established.The research results can provide references for the design and optimization of spray tower and other equipment.