NDLI: Theoretical Model of Droplets Motions on Solid Surface With Radial Wettable and Evaporation Rate Gradients

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Theoretical Model of Droplets Motions on Solid Surface With Radial Wettable and Evaporation Rate Gradients

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yang, Yanjie Wu, Zan Chen, Xiaoqian Sundén, Bengt Huang, Yiyong
Copyright Year	2018
Abstract	Wettability gradient in radial direction and evaporation rate gradient can cause droplet motion on a solid surface. Here a theoretical model is proposed. Besides, an equation of droplet velocity is derived on a solid surface. We consider the wettability and evaporation rate gradients are mainly caused by the chemical composition and surface roughness, only along the radial direction. Surface tension at the liquid-vapor interface is constant as it is assumed that the temperature does not change during the whole process. Thus, Marangoni effect induced by the liquid-vapor surface tension gradient is neglected. Besides, as droplet size is set as less than the capillary length (l=γ/ρg), the gravity effect is ignored as well. The velocity at the droplet center on a gradient surface along the radial direction is half of that along the x-direction. With the simulation of water droplet, the center velocity decreases with time and the droplet radius increases at the beginning part and then decreases.
File Format	PDF
ISBN	9780791852118
DOI	10.1115/IMECE2018-87890
Volume Number	Volume 8A: Heat Transfer and Thermal Engineering
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Water Temperature Simulation Gravity (force) Drops Vapors Surface tension Surface roughness Evaporation
Content Type	Text
Resource Type	Article

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