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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)

Influence of Cavity Height and Cascading on Poiseuille Number in Slip Flow

Richie Garg
Department of Mechanical Engineering, IIT Bombay

Amit Agrawal
Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 4000076, India

DOI: 10.1615/IHMTC-2019.730
pages 431-436

要約

Three-dimensional numerical simulations have been performed to study the effect of external cavities located on the side walls of a microchannel. Rectangular micro-cavities have been modeled with different heights (5 µm < h < 100 µm) and alignment. A compressible flow solver is used for carrying out the simulations at various outlet Knudsen number (4.44×10-4 < Kn < 2.07×10-2) and Reynolds number (0.1 < Re < 50.3) at a wall temperature of 300 K. It is observed that friction factor (f) decreases with increase in cavity height. There exists a critical height (hc) beyond which decrease in Poiseuille number (fRe) does not occur at a specific Re and Kn. Drag reduction is not achieved by cascading the transverse cavities on the upper and bottom wall of the microchannel with a phase-shift. This study is applicable is designing low flow friction microchannels.

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