ISSN オンライン: 2688-7231
ISBN 印刷: 978-1-56700-497-7 (Flash Drive)
ISBN オンライン: 978-1-56700-496-0
Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)
Flow Analyses of a Contraction-Expansion Microchannel using micro-PIV
Microfluidics has brought a need for several microchannel devices capable of controlling flow parameters using small flow volume. The present study aims at fabrication and study of a contraction-expansion microchannel (CEM). The study reports the effect on flow characteristics due to the contraction-expansion microchannel setup using a micro-PIV. Fabricated microchannel consists of contraction-expansion zone with an area ratio of 1:3. The study is conducted for three flow rates of 20, 50 and 100 ml/hr. The results suggest that the contraction-expansion microchannel generates a recirculation zone and induce high fluctuations which could influence mixing. Recirculation zone moves and its size and location depend on the inlet flow rate thus larger recirculation zone can be formed even at low Reynolds number. At high flow rate, dean vortices are clearly seen in the contraction zone and expansion vortices in the expansion zone. The results of the present study conclude that microchannel containing contraction-expansion zone array could be helpful to enhance mixing at the micro-level.