摘要
液体在固体表面上的润湿铺展在许多科学和工程领域中有重要意义,但是外界能量诱导润湿的机理尚不清楚。本文研究了在超声振动作用下原子/分子液体的润湿性,并探讨了其铺展驱动力。研究表明,超声振动作用下能显著提高液体在固体表面的润湿性。超声波提高液体的润湿性主要是由两个因素造成的。一方面,超声波在固/液界面处产生动量传递层,对于润湿系统,该层可以驱动液体的润湿铺展,但是对于非润湿系统,当接触角在90°附近时,界面处的动量传递并不是它的驱动力。另一方面,超声振动引起的气液界面粗化(即,在气液界面的表面张力波)也是驱动液体润湿铺展的因素之一。因此,在超声辅助钎焊的应用中,超声振动提高润湿性的主要原因可能是上述提到的物理因素,而不是固液界面的化学反应.
It’s exceedingly important for the wetting and spreading of liquids on solid surfaces in many scientific and engineering fields.However,the mechanism of induced wetting by external energy is not clear.In this paper,The wetting of atomic/molecular liquid under the ultrasonic vibration were studied for the probing of the spreading driving force.Studies have shown that ultrasonic vibration can significantly improve the wettability of liquid on solid surfaces.Ultrasonic waves increase the wettability of liquids mainly by two factors.On the one hand,the ultrasonic waves create a momentum transfer layer at the solid/liquid interface,for the wetting system,the layer can drive liquid wetting spreading,but for non wetting system,when the contact Angle near the 90°,the momentum transfer interface and not its driving force.On the other hand,The ultrasonic vibration induced the liquid-vapor interface roughening(i.e.,the capillary wave at liquid-vapor interface)also can be a factor of driving force.Therefore,in the application of ultrasonic-assisted brazing,the improved wettability by the ultrasonic vibration may be mainly caused by the mentioned physical factors rather than the chemical reaction at the solid-liquid interface.
作者
俞伟元
邢春晓
林巧力
YU Wei-Yuan;XING Chun-Xiao;LIN Qiao-Li(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第5期1186-1191,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51665031,No.51465032)。
关键词
钎焊
界面
润湿性
brazing
interface
wettability
作者简介
俞伟元(1973-),男,教授,博士,主要从事润湿性研究;通信作者:林巧力,教授,E-mail:lqllinqiaoli@163.com。
