点阵玻尔兹曼方法在通道中液滴位移的数值研究

IF 0.7 Q4 THERMODYNAMICS

Interfacial Phenomena and Heat Transfer Pub Date : 2019-01-01 DOI:10.1615/INTERFACPHENOMHEATTRANSFER.2019030498

Bo Xu, Xin Wang, Zhen-qian Chen

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引用次数: 0

摘要

采用点阵玻尔兹曼方法，对不混相液滴在重力作用下的位移进行了数值研究。说明了液滴的动力学行为，分析了重力系数、接触角和液滴尺寸对润湿长度的影响。θ = 57.0◦时，液滴润湿长度随时间步长增加，最终掐断。当θ = 88.8◦和113.8◦时，两者的润湿长度均随时间步长减小，但在113.8◦时，润湿长度减小至零并与表面分离，与88.8◦不同。此外，重力系数对润湿长度有显著影响。θ = 57.0◦时，润湿长度随重力系数的增大而增大。当它增加到0.002时，液滴就会脱落。θ = 113.8◦的液滴更容易与表面分离。当θ = 113.8◦时，较大的液滴半径有利于从表面分离，当θ = 57.0◦和θ = 88.8◦时，润湿长度延长。

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NUMERICAL STUDY OF DISPLACEMENT OF DROPLET IN A CHANNEL BY LATTICE BOLTZMANN METHOD

Displacement of an immiscible droplet subject to gravitational force in a channel is studied numerically by the lattice Boltzmann method. Dynamic behavior of the droplet is illustrated and the influence of gravitational coefficients, contact angles, and droplet size on the wetting length is analyzed. For θ = 57.0◦, the wetting length of the droplet increases with the time step and finally pinches off. For θ = 88.8◦ and 113.8◦, the wetting length for both decreases with the time step, but it will decrease to zero and detach from the surface for 113.8◦, which is different from 88.8◦. Furthermore, the gravitational coefficient has a significant influence on the wetting length. In the case of θ = 57.0◦, the wetting length increases with the increase in gravitational coefficient. As it increases to 0.002, the droplet pinches off. It is easier for the droplet with θ = 113.8◦ to detach from the surface. The larger droplet radius is beneficial for detaching from the surface for θ = 113.8◦ and the wetting length is extended for θ = 57.0◦ and θ = 88.8◦.

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来源期刊

Interfacial Phenomena and Heat Transfer THERMODYNAMICS-

CiteScore

1.70

自引率

40.00%

发文量

期刊介绍： Interfacial Phenomena and Heat Transfer aims to serve as a forum to advance understanding of fundamental and applied areas on interfacial phenomena, fluid flow, and heat transfer through interdisciplinary research. The special feature of the Journal is to highlight multi-scale phenomena involved in physical and/or chemical behaviors in the context of both classical and new unsolved problems of thermal physics, fluid mechanics, and interfacial phenomena. This goal is fulfilled by publishing novel research on experimental, theoretical and computational methods, assigning priority to comprehensive works covering at least two of the above three approaches. The scope of the Journal covers interdisciplinary areas of physics of fluids, heat and mass transfer, physical chemistry and engineering in macro-, meso-, micro-, and nano-scale. As such review papers, full-length articles and short communications are sought on the following areas: intense heat and mass transfer systems; flows in channels and complex fluid systems; physics of contact line, wetting and thermocapillary flows; instabilities and flow patterns; two-phase systems behavior including films, drops, rivulets, spray, jets, and bubbles; phase change phenomena such as boiling, evaporation, condensation and solidification; multi-scaled textured, soft or heterogeneous surfaces; and gravity dependent phenomena, e.g. processes in micro- and hyper-gravity. The Journal may also consider significant contributions related to the development of innovative experimental techniques, and instrumentation demonstrating advancement of science in the focus areas of this journal.