Indian Society for Heat and Mass Transfer

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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

Interfacial Viscous Force: A Significant Aspect of Air-Water Meniscus Shape in Superhydrophobic Microchannel

Prasenjit Dey
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai, India

Sandip Kumar Saha
Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai – 400076. Maharashtra, India

Suman Chakraborty
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India; Advanced Technology Development Centre, Indian Institute of Technology Kharagpur 721302, Kharagpur, India

DOI: 10.1615/IHMTC-2019.860
pages 509-514


The behaviour and significance of interfacial viscous force on the air-water interface in a superhydrophobic microchannel are investigated numerically. The microchannel contains superhydrophobic roughness of triangular shape at the top and bottom surfaces of the microchannel. The effect of microgroove width and flow condition on the interfacial viscous force is also investigated. It is observed that the interfacial viscous force increases with increasing fluid velocity, and also an incremental characteristic is found when microgroove width is varied from 40 µm to 140 µm. Moreover, the air-water interface is found concave, flat and convex within the considered microgroove widths. The present numerical study reveals that the interfacial viscous force plays a vital role on the meniscus shape along with the Laplace pressure force and this meniscus is also important for obtaining maximum drag reduction for a particular superhydrophobic geometry.

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