Effect of Interfacial Curvature on Drag Reduction of Superhydrophobic Microchannels

Authors

Chunxi Li, Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry (North China Electric Power University), Baoding 071003, China;
Zhang Shuo, Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry (North China Electric Power University), Baoding 071003, China;
Xuemin Ye, Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry (North China Electric Power University), Baoding 071003, China;

Abstract

Abstract: The two-dimensional fluid flow in superhydrophobic microchannels with transverse grooves was numerically simulated with Fluent to investigate the impact of the liquid-gas interface curvature on the effective slip behavior in the laminar regime. The effects of shear-free fraction, normalized periodic cell length and Reynolds number on the normalized slip length and pressure drop reduction are also examined. The results show that as protrusion angle increases, the normalized slip length and pressure drop reduction exhibit with single-hump variations. When θ=θ_opt, increments in the normalized slip length and pressure drop reduction tend to be greater as shear-free fraction and normalized periodic cell length decrease, leading to the better drag reduction effect. When θ?θ_n, especially θ?90°, the transverse grooves deteriorate flow resistance, and the normalized slip length and pressure drop reduction decrease significantly with increasing shear-free fraction and normalized periodic cell length. The effect of Reynolds number on drag reduction is approximately negligible.

Recommended Citation

Li, Chunxi; Shuo, Zhang; and Ye, Xuemin (2018) "Effect of Interfacial Curvature on Drag Reduction of Superhydrophobic Microchannels," Journal of System Simulation: Vol. 30: Iss. 6, Article 51.
DOI: 10.16182/j.issn1004731x.joss.201806051
Available at: https://dc-china-simulation.researchcommons.org/journal/vol30/iss6/51

First Page

2405

Revised Date

2016-12-21

DOI Link

https://doi.org/10.16182/j.issn1004731x.joss.201806051

Last Page

2413

CLC

O35

Recommended Citation

Li Chunxi, Zhang Shuo, Ye Xuemin. Effect of Interfacial Curvature on Drag Reduction of Superhydrophobic Microchannels[J]. Journal of System Simulation, 2018, 30(6): 2405-2413.

DOI

10.16182/j.issn1004731x.joss.201806051