10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Investigation of the Contact Force Model of a Micrometer-sized Particle Impacting on a Wetted-surface
HUANG ZHANG, Qianfeng Liu, Yiyang Zhang, Shuiqing Li, Pratim Biswas, Washington University in St Louis
Abstract Number: 251 Working Group: Aerosol Physics
Abstract The system of a micrometer sized particle impacting on a wetted surface is usually observed in many industrial processes including additive manufacturing, 3-D printing and other technologies. Different from the millimeter grains, the particles with micrometer-sizes will experience a strong adhesion effect due to van der Waals force. Besides, the thin liquid layer on the wetted wall will supply additional cohesive and resistance influences on the falling particle. A theoretical study is carried out to depict the falling, penetrating, and bouncing process of a micrometer-sized particle. Especially, the Hamaker constant of the van der Waals force was carefully studied in considering that there is a liquid film between the particle and the surface. Various contact forces were modeled to establish a governing ordinary differential equation of the impacting particle. Besides, the evolution of the position, velocity, acceleration and restitution coefficient of the particle were determined to compare with those of millimeter sized particles. Finally, the models of the different contact forces were analyzed and compared to experimental data.