摘要
建立了竖直平板降膜蒸发的二维物理与数学模型,采用数值模拟方法研究了脉动气流对降膜蒸发过程的影响,分析了在不同气流平均速度、振幅和频率下Sherwood数Sh的变化规律.结果表明:在脉动相对振幅为5/6时,竖直平板降膜蒸发传质效果提高了6.6%;Womersley数Wo大于26时,传质效果提高了8.3%.相对匀速气流,脉动气流可有效增强降膜蒸发的对流传质效果.
A 2D physical and mathematical model for vertical plate falling film evaporation was established.The effects of pulsating airflow on the falling film evaporation process were studied through numerical simulation.The change rule of the Sherwood number under different average air velocities,amplitudes and frequencies was analyzed.The results show that,when the relative amplitude of pulsation is 5/6,the mass transfer efficiency of the vertical falling film will increase by 6.6%;when the Womersley number is greater than 26,the mass transfer efficiency will increase by 8.3%.Compared with uniform airflow,the pulsating airflow can effectively enhance the convective mass transfer of falling film evaporation.
作者
钟音
凌长明
谢公南
ZHONG Yin;LING Changming;XIE Gongnan(Shenzhen Institute of Guangdong Ocean University,Shenzhen,Guangdong 518108,P.R.China;School of Mechanical and Power Engineering,Guangdong Ocean University,Zhanjiang,Guangdong 524088,P.R.China;School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,P.R.China)
出处
《应用数学和力学》
CSCD
北大核心
2020年第5期491-498,共8页
Applied Mathematics and Mechanics
基金
深圳市科技计划项目(JCYJ20170306162116012,JCYJ20170818111558146)
大鹏新区产业发展专项资金项目(KY20180113)
广东省科技计划项目(2017A050506054)。
关键词
竖直平板
降膜蒸发
脉动气流
数值模拟
vertical plate
falling water film evaporation
pulsating airflow
numerical simulation
