Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
Computer Simulations on Heat Transfer Enhancement in a Minichannel Heat Sink using Modified Butterfly Inserts
Resumo
The present study numerically investigates the impact of modified butterfly inserts, where the consecutive inserts are perpendicular to each other, on the thermohydraulic performance of a square copper minichannel heat sink using deionized water cooling. ANSYS Fluent 2021 R2 is employed to scrutinize two discrete pitch lengths, 10mm (m-MCHS-BTI-10) and 5mm (m-MCHS-BTI-5), within laminar Reynolds number range 200 to 900. Results indicate friction factor enhancement ratio, which is a measure of rise in pressure drop of the enhanced configuration compared to a plain minichannel heat sink, attains value up to 4.97 and 6.89 for m-MCHS-BTI-10 and m-MCHS-BTI-5, respectively, at the highest tested Reynolds number. At a Reynolds number of 900, the Nusselt number enhancement ratios are 2.49 and 3.95, respectively, for m-MCHS-BTI-10 and m-MCHSBTI-5 cases indicating the significant improvement in heat
transfer. Furthermore, using Performance Evaluation Criteria
(PEC), the insert's overall performance is assessed, resulting
in a range of 1.08 to 1.46 and 1.4 to 2.07 for the m-MCHS-BTI-10 and m-MCHS-BTI-5, respectively across the studied Reynolds numbers. Additionally, modified butterfly inserts in this study show PEC value improvement of 4.10% − 12.52% and 13% − 28% for pitch distances of 10mm and 5mm, respectively, compared to conventional butterfly
inserts, across the studied Reynolds number range.