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Roughness Effects on Continuous and Discrete Flows in Superhydrophobic Microchannels

Communications in Computational Physics 2011年第5期9卷 1094-1105页

作者： Junfeng Zhang Daniel Y.Kwok School of Engineering Laurentian UniversitySudburyOntarioP3E 2C6Canada Nanoscale Technology and Engineering Laboratory Department of Mechanical EngineeringSchulich School of EngineeringUniversity of CalgaryCalgaryAlbertaT2N 1N4Canada

The dynamic behaviors of continuous and discrete flows in superhydrophobic microchannels are investigated with a lattice Boltzmann *** characters of the superhydrophobic phenomenon are well observed from our simulations,including air trapped in the surface microstructures,high contact angles,low contact angle hysteresis,and reduced friction to fluid *** the roughness of a hydrophobic surface can produce a large flow rate through the channel due to the trapped air,implying less friction or large apparent *** apparent slip length appears to be independent to the channel width and could be considered as a surface *** a moving droplet,its behavior is affected by the surface roughness from two aspects:the contact angle difference between its two ends and the surface-liquid interfacial *** a consequence,the resulting droplet velocity changes with the surface roughness as firstly decreasing and then *** results are also compared with experimental observations and better agreement has been obtained than that from other numerical *** information from this study could be valuable for microfluidic systems.

关键词： Lattice Boltzmann method interfacial slip superhydrophobicity solid-fluid interaction roughness effect microchannels

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Dynamic modeling of micro- and nano-sized particles impinging on the substrate during suspension plasma spraying

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第9期17卷 733-744页

作者： Kai ZHANG Hong-bing XIONG Xue-ming SHAO State Key Laboratory of fluid Power and Mechatronic Systems College of Mechanical Engineering Zhejiang University Hangzhou 310027 China

Suspension plasma spraying （SPS） can be utilized to manufacture finely structured coatings. In this process, liquid suspended with microor nano-sized solid particles is injected into a plasma jet. It involves droplet injection, solvent evaporation, and discharge, acceleration, heating, and melting of the solid particles. The high-speed and high-temperature particles final- ly impact on the substrate wall, to form a thin layer coating. In this study, a comprehensive numerical model was developed to simulate the dynamic behaviors of the suspension droplets and the solid particles, as well as the interactions between them and the plasma gas. The plasma gas was treated as compressible, multi-component, turbulent jet flow, using Navier-Stokes equations solved by the Eulerian method. The droplets and solid particles were treated as discrete Lagrangian entities, being tracked through the spray process. The drag force, Saffman lift force, and Brownian force were taken into account for the aerodynamic drag force, aerodynamic lift force, and random fluctuation force imposed on the particles. Spatial distributions of the micro- and nano-sized particles are given in this paper and their motion histories were observed. The key parameters of spray distribution, including particle size and axial spray distance, were also analyzed. The critical size of particle that follows well with the plasma jet was deduced for the specified operating conditions. Results show that in the downstream, the substrate influences the flow field structure and the particle characteristics. The appropriate spray distances were obtained for different microand nano-sized particles.

关键词： Suspension plasma spray (SPS) Stokes number Brownian force Multiphase flow solid-fluid interaction

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