超声波瞬间雾化结霜初始阶段液滴的可视化

doi:10.3969/j.issn.0438-1157.2013.11.005

化工学报 ›› 2013, Vol. 64 ›› Issue (11): 3910-3916.DOI: 10.3969/j.issn.0438-1157.2013.11.005

超声波瞬间雾化结霜初始阶段液滴的可视化

李栋, 陈振乾

东南大学能源热转换及其过程测控教育部重点实验室, 江苏南京 210096

收稿日期:2013-03-15 修回日期:2013-04-26 出版日期:2013-11-05 发布日期:2013-11-05
通讯作者: 陈振乾
作者简介:李栋(1985-),男,博士研究生。
基金资助:
东南大学优秀博士学位论文基金项目(YBJJ1203)。

Visualization of ultrasonic vibration for instantaneously atomizing water droplets in initial frost growth stage

LI Dong, CHEN Zhenqian

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China

Received:2013-03-15 Revised:2013-04-26 Online:2013-11-05 Published:2013-11-05
Supported by:
supported by the Scientific Research Foundation of Graduate School of Southeast University(YBJJ1203).

摘要/Abstract

摘要： 介绍了一种超声波抑霜新方法。对频率20 kHz,功率50 W的超声波作用下铝表面液滴的动态行为进行了可视化观测。记录了超声开启瞬间液滴变形-铺展-雾化的全过程。试验结果发现,超声作用时,铝表面上的液滴首先产生剧烈扰动,继而变形、铺展。当液膜厚度减小到一临界值时,液滴瞬间雾化。超声机械作用产生的界面剪切力以及空化作用产生的高压冲击分别可能是诱发液滴变形和雾化的主要因素。结果初步表明,高频超声振动能够瞬间除去铝平板表面作为结霜初始阶段的液滴,为冷表面有效抑霜提供了可能。

关键词: 超声振荡, 液滴, 变形和铺展, 雾化, 空穴

Abstract: A novel method using ultrasound is introduced for frost suppression on cold flat surface.The dynamic behavior of water droplets dropped on aluminum surface subjected to 20 kHz and 50W ultrasonic vibration was visually studied.The transient processes of deformation,spreading and atomization of water droplets on aluminum surface due to ultrasonic vibration were recorded.The experimental results indicate that the intense disturbance first occurs in the water droplet subjected to instantaneous incentive due to the effect of ultrasonic vibration and then the droplet deforms and spreads.When the liquid film thickness decreases to a critical value,the water droplet instantaneously atomizes.The interfacial shear force generated by ultrasonic mechanical effect and the high pressure impact induced by ultrasonic cavitation might be respectively the dominant factor for droplet deformation and atomization.The results preliminarily show that the ultrasonic vibration can instantaneously atomize the water droplet on aluminum surface in the initial stage of frosting,which provides a possibility for effective frost suppression on cold surface.

Key words: ultrasonic vibration, water droplet, deformation and spreading, atomization, cavitations

中图分类号:

TK124

李栋, 陈振乾. 超声波瞬间雾化结霜初始阶段液滴的可视化[J]. 化工学报, 2013, 64(11): 3910-3916.

LI Dong, CHEN Zhenqian. Visualization of ultrasonic vibration for instantaneously atomizing water droplets in initial frost growth stage[J]. CIESC Journal, 2013, 64(11): 3910-3916.

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超声波瞬间雾化结霜初始阶段液滴的可视化

Visualization of ultrasonic vibration for instantaneously atomizing water droplets in initial frost growth stage

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