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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (6): 1191-1198    DOI: 10.3785/j.issn.1008-973X.2022.06.017
能源与机械工程     
液滴撞击加热亲水管壁后的反弹和中心射流
王开珉(),张玉杰,康培森,刘宏升,刘晓华*()
大连理工大学 能源与动力学院，海洋能源利用与节能教育部重点实验室，辽宁 大连 116024
Droplet rebound and central jet after impacting hydrophilic tubular surface
Kai-min WANG(),Yu-jie ZHANG,Pei-sen KANG,Hong-sheng LIU,Xiao-hua LIU*()
School of Energy and Power Engineering, Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China
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摘要：

采用高速摄像机拍摄水滴撞击加热亲水管壁的动态过程，研究在不同撞击速度（韦伯数）和壁面温度下，液滴撞击后出现的液膜反弹和中心射流现象. 不同于液滴撞击常温亲水管壁，液滴撞击加热亲水管壁后会反弹. 在曲率比（液滴直径与管外壁直径的比值）为0.15，撞击速度为0.47~1.40 m/s，壁面温度为20~305 ℃的条件下，观测到“回缩?反弹”“铺展?反弹”和“破碎?反弹”3种反弹形式，总结其发生条件. 壁面温度是决定液滴撞击后能否发生反弹的关键因素，壁面温度和韦伯数均对“破碎?反弹”的产生有显著影响. 从重力、惯性力和气化反作用力角度分析产生快速“铺展?反弹”现象的原因. 分析中心射流形成原因，发现增加壁面温度和韦伯数有利于不完全中心射流的形成.
关键词： 液滴撞击;  加热管壁;  撞击速度;  中心射流;  液膜反弹    
Abstract:

The dynamic characteristics of water droplet impacting a hydrophilic tubular surface were recorded by a high-speed camera, the droplet rebound and central jet were studied under different impact velocities (Weber number) and surface temperatures. The droplet can rebound after impacting a heated hydrophilic tubular surface, while not for a hydrophilic tubular surface of room temperature. The curvature ratio (the ratio of droplet diameter to tube outer diameter) was 0.15, impact velocity ranged from 0.47 to 1.40 m/s, and the surface temperature ranged from 20 to 305 ℃, three rebound forms were observed: “retraction-rebound” “spread-rebound” and “splash-rebound”, the formation conditions of which were summarized. The surface temperature determines whether droplet can rebound or not, it, as well as Weber number can influence the formation of “splash-rebound” significantly. The formation of a fast “spread-rebound” was analyzed from the gravity, inertial force, and gasification reaction force. The formation of central jet was analyzed, the increase in the surface temperature and Weber number were beneficial to the occurrence of the incomplete central jet.
Key words: droplet impact    heated tubular surface    impact velocity    central jet    droplet rebound
收稿日期: 2021-08-01 出版日期: 2022-06-30
CLC:  O 359  
基金资助: 辽宁省中央引导地方科技发展专项项目（2021JH6/10500150）；国家自然科学基金资助项目（51476017，51576029）
通讯作者: 刘晓华     E-mail: kmwang_9410@mail.dlut.edu.cn;lxh723@dlut.edu.cn
作者简介: 王开珉（1994—），男，博士生，从事液滴撞击过程研究. orcid.org/0000-0002-1753-3116. E-mail： kmwang_9410@mail.dlut.edu.cn
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引用本文:

王开珉,张玉杰,康培森,刘宏升,刘晓华. 液滴撞击加热亲水管壁后的反弹和中心射流[J]. 浙江大学学报(工学版), 2022, 56(6): 1191-1198.

Kai-min WANG,Yu-jie ZHANG,Pei-sen KANG,Hong-sheng LIU,Xiao-hua LIU. Droplet rebound and central jet after impacting hydrophilic tubular surface. Journal of ZheJiang University (Engineering Science), 2022, 56(6): 1191-1198.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.06.017    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I6/1191

图 1  液滴撞击加热管壁的实验系统示意图
图 2  液滴撞击管壁过程的物理模型
图 3  不同初始撞击速度下液滴撞击加热管壁的动态过程（θW = 260 ℃）
图 4  不同韦伯数、壁面温度下的液膜反弹
图 5  不同壁面温度下液滴撞击加热管壁的动态过程（We = 31.0）
图 6  中心射流现象放大图（vo = 1.40 m/s，θW = 260 ℃）
图 7  不完全的中心射流现象（v0 = 1.24 m/s，θW = 260 ℃）
图 8  不同韦伯数、壁面温度下液膜的中心射流情况
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