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Bubble characterizations on hydrophobic surface using lattice Boltzmann simulation with large density ratios

Peng Du (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China and Laboratoire Roberval, Universite de Technologie de Compiegne, Compiegne, France)
Haibao Hu (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China and Research & Development Institute in Shenzhen, Northwestern Polytechnical University, Shenzhen, China)
Feng Ren (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China)
Dong Song (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 5 June 2017

Abstract

Purpose

The maintenance of the air–water interface is crucial for the drag reduction on hydrophobic surfaces. But the air bubbles become unstable and even washed away under high speed flow, causing the failure of surface hydrophobicity. Thereby, this paper aims to understand the relations between bubble behaviors and surface properties, flow conditions and to discover new methods to maintain the air–water interface.

Design/methodology/approach

Bubble properties on hydrophobic surfaces were characterized using single-component multiphase lattice Boltzmann simulation. Three equations of state (EOSs), including the Peng–Robinson, Carnahan–Starling and modified Kaplun–Meshalkin EOSs, were incorporated to achieve high density ratios.

Findings

Both the static and dynamic properties of bubbles on hydrophobic surfaces were investigated and analyzed under different flow conditions, solid–liquid interactions and surface topology.

Originality/value

By revealing the properties of bubbles on hydrophobic surfaces, the effects of flow conditions and surface properties were characterized. The maintenance method of air–water interface can be proposed according to the bubble properties in the study.

Keywords

Acknowledgements

The authors acknowledge the supports from the National Science Foundation of China (Grant No. 51679203) and Natural Science Basic Research Plan in Shenzhen city of China (Grant No. JCYJ20160510140747996).

Citation

Du, P., Hu, H., Ren, F. and Song, D. (2017), "Bubble characterizations on hydrophobic surface using lattice Boltzmann simulation with large density ratios", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 6, pp. 1311-1322. https://doi.org/10.1108/HFF-02-2016-0062

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited