Modeling of Liquid Bridge and Surface Wetting on Two Rigid Spherical Particles
Modeling of Liquid Bridge and Surface Wetting on Two Rigid Spherical Particles
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两种刚性球形颗粒上的液桥和表面润湿建模
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Zhu
中科院分区：
文献类型：
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作者：
Raivat Patel;Dawei Wang;C. Zhu
模拟了两颗粒间液桥中液体在颗粒表面的扩散和排水过程，研究了颗粒温度和附着在两颗粒间的液体质量的初始动能对液滴撞击形成液桥对液体扩散的影响。在石油炼制、喷涂、絮凝等涉及液滴与固体颗粒碰撞的工业过程中，液桥的扩散和排水是导致颗粒结块的关键因素。提出了一种基于质能守恒的两颗粒间液体捕获模型，用于估算被液体排水润湿的颗粒表面积和热固体颗粒向液膜传递热量影响下的液膜厚度以及扩散液体的初始动能。采用离散方法求解液桥的Laplace-Young模型，得到液桥在扩散和排水作用下的体积和表面变化。该模型能够确定涂敷液的瞬态表面覆盖率、液膜厚度及其温度。研究了扩散液初始动能、颗粒初始温度等关键参数对润湿厚度和润湿面积的影响。ASME版权所有©2010
Spreading and drainage of liquid over particle surface in a liquid bridge between two particles has been modeled to study the influence of temperature of particle and initial kinetic energy of liquid mass remain attached between two particles on impingement of droplet to form liquid bridge on liquid spreading. The spreading and drainage of liquid bridge is a key factor for particle agglomeration, which is commonly encountered in many industrial processes such as petroleum refinery, spray coating and flocculation which involve the collision of droplet and solids particles. A model based on mass and energy conservation of liquid trapped between two particles has been proposed to estimate the surface area of particle wetted by the liquid drainage and the thickness of liquid film under the influence of heat transfer to the liquid film from hot solid particles and initial kinetic energy of spreading liquid. The Laplace-Young model of liquid bridge is solved with discrete method to obtain the volume and surface change of liquid bridge due to spreading and drainage effect. The proposed model is capable of determining transient surface coverage of spreading liquid, liquid film thickness and its temperature. The influence of some key parameters, such as initial kinetic energy of spreading liquid, initial temperature of particle on the wetting thickness and wetting area is also investigated.Copyright © 2010 by ASME