液滴撞击液膜的流热耦合界面追踪方法数值模拟

计算物理 ›› 2020, Vol. 37 ›› Issue (4): 422-430.

液滴撞击液膜的流热耦合界面追踪方法数值模拟

高辉, 高瑞峰, 姚孟君, 张道旭, 彭澄宇, 张莹

南昌大学机电工程学院, 江西南昌 330031

收稿日期:2019-07-15 修回日期:2019-08-09 出版日期:2020-07-25 发布日期:2020-07-25
通讯作者: 张莹,女,博士,教授,研究方向为复杂热流体数值模拟,E-mail:yzhan2033@163.com
作者简介:高辉,男,硕士研究生,研究方向为多相流数值模拟等,E-mail:704233851@qq.com
基金资助:
国家自然科学基金（11562011，51566012）及江西省自然科学基金（20181BAB206031）资助项目

Numerical Simulation of Fluid-Thermal Coupled in Droplet Impact onto Liquid Film: Front Tracking Method

GAO Hui, GAO Ruifeng, YAO Mengjun, ZHANG Daoxu, PENG Chengyu, ZHANG Ying

School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China

Received:2019-07-15 Revised:2019-08-09 Online:2020-07-25 Published:2020-07-25

摘要/Abstract

摘要： 采用界面追踪方法研究蒸馏过程中液滴撞击高温薄液膜的流动和传热特性，将数值结果与解析解和实验进行比较验证模型的正确性，研究气液界面和热流分布的演变过程.同时，分析液滴We数和无量纲液膜厚度对传热的影响.液滴撞击后的热流密度分布显示：液膜可分为撞击区、过渡区和静态区.由于液滴的撞击作用，强制对流是撞击区内主要的传热机制.增大液滴的韦伯数或减小无量纲液膜厚度会加强热量传递.随着液滴韦伯数的增加，冲击引起的扰动增强，在动量和能量共同作用下，平均热流密度明显增大，撞击区冠状水花越明显.无量纲液膜厚度越小，平均热流密度越大，且有更长的时间保持高热流密度换热.

关键词: 太阳能海水淡化, 液滴撞击, 流动传热, 界面追踪方法

Abstract: Flow and heat transfer characteristics of a droplet impact onto a relatively high temperature thin film during distillation was studied by means of front tracking method. The proposed model was validated by numerical results with analytical solutions. Evolution of gas-liquid interface and heat flux distribution were investigated. Meanwhile, effect of Weber number and dimensionless liquid film thickness on heat transfer was analyzed. It indicates that according to heat flux distribution after impact liquid film can be classified into three zones: The impact zone, the transition zone and the static zone. Forced convection is the main heat transfer mechanism inside the impact zone mainly due to impact. Increasing Weber number or decreasing dimensionless film thickness could enhance heat transfer. With the increase of Weber number, disturbance caused by impact on liquid film strengthens, which makes synergy of momentum and energy more obvious, thus increasing average heat flux between liquid and solid wall, and coronal spray in the impact zone becomes more obvious. The smaller the dimensionless liquid film thickness is, the greater the average heat flux density is, and the longer the heat transfer duration of high heat flux density is.

Key words: solar desalination, droplet impact, flow and heat transfer, front-tracking method

中图分类号:

TB61⁺1

高辉, 高瑞峰, 姚孟君, 张道旭, 彭澄宇, 张莹. 液滴撞击液膜的流热耦合界面追踪方法数值模拟[J]. 计算物理, 2020, 37(4): 422-430.

GAO Hui, GAO Ruifeng, YAO Mengjun, ZHANG Daoxu, PENG Chengyu, ZHANG Ying. Numerical Simulation of Fluid-Thermal Coupled in Droplet Impact onto Liquid Film: Front Tracking Method[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 37(4): 422-430.

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