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

ISBN Druckformat: 978-1-56700-497-7 (Flash Drive)
ISBN Online: 978-1-56700-496-0

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

DOI: 10.1615/IHMTC-2019.730
pages 431-436

Richie Garg
Department of Mechanical Engineering, IIT Bombay

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

Abstrakt

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.