NUMERICAL STUDY OF THE RELATIONSHIP BETWEEN APPARENT SLIP LENGTH AND CONTACT ANGLE BY LATTICE BOLTZMANN METHOD

• Published in: Journal of hydrodynamics. Series B Vol. 24; no. 4; pp. 535 - 540
• Main Authors: ZHANG, Ren-liang, DI, Qin-feng, WANG, Xin-liang, DING, Wei-peng, GONG, Wei
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.09.2012; Springer Singapore; Shanghai Institute of Applied Mathematics and Mechanics and Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China
• Subjects: apparent slip; Computational fluid dynamics; Contact angle; Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; Lattice Boltzmann Method (LBM); Lattices; Liquids; Mathematical models; nano-particles adsorbing method; Numerical and Computational Physics; Simulation; Slip; Walls; Wettability; 多相流模型; 接触角; 数值研究; 格子Boltzmann方法; 格子玻尔兹曼方法; 滑移; 表观; 长度; nano-particles adsorbing method; wettability; contact angle; Lattice Boltzmann Method (LBM); apparent slip
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(11)60275-8

The apparent slip between solid wall and liquid is studied by using the Lattice Boltzmann Method (LBM) and the Shan-Chen multiphase model in this paper. With a no-slip bounce-back scheme applied to the interface, flow regimes under different wall wettabilities are investigated. Because of the wall wettability, liquid apparent slip is observed. Slip lengths for different wall wettabilities are found to collapse nearly onto a single curve as a function of the static contact angle, and thereby a relationship between apparent slip length and contact angle is suggested. Our results also show that the wall wettability leads to the formation of a low-density layer between solid wall and liquid, which produced apparent slip in the micro-scale.