固体表面液滴在吹风作用下的振荡特性  

Oscillation characters of droplets on solid surface under air flow

作　　者：林志勇[1] 彭晓峰[1] 王晓东[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《热科学与技术》2005年第1期24-28,共5页Journal of Thermal Science and Technology

基　　金：国家自然科学基金青年基金资助项目 (5 0 40 60 0 1) .

摘　　要：利用可视化实验观察了水平表面液滴在吹风条件下的振荡现象。针对水液滴在不同型号砂纸打磨的铜表面进行实验 ,观察到液滴在吹风条件下发生上下和左右两种振荡模式 ,在一定的条件下两种模式可以相互转化。通过细致的观察分析 ,总结归纳了振荡及转化发生的规律。实验结果表明 :液滴的振荡特性同表面粗糙度、液滴尺寸、风速等有一定的关系。振荡周期随着液滴尺寸增大而增大 ,随着风速的增大阶跃式增大 ;随粗糙度增大 ,液滴振荡周期有先增大再减小的趋势。Visual experiment was carried out to observe the droplet oscillation on horizontal surface under air flow, with different Cu surfaces polished by different sandpapers. Two liquid drop oscillation modes, forward-backward and upward-downward mode, were visually observed experimentally. Two modes were observed to transit from one to another under some conditions. Droplet oscillation and transition principle were summarized by detailed observation. The result shows that oscillating characters are relative to surface roundness, droplet size and flow velocity. Larger radius and higher air speed will decrease the oscillation frequency, while the roughness will first decrease and then increase the frequency from the smooth to rough plates.

关 键 词：液滴 固体表面 振荡特性 振荡周期 条件 归纳 相互转化 吹风 振荡模式 振荡现象 

分 类 号：O359[理学—流体力学] TK263.1[理学—力学]