Thermal Performance Analysis of Micro Pin Fin Heat Sinks under Different Flow Conditions

Jéssica Martha Nunes, Jeferson Diehl de Oliveira, Jacqueline Biancon Copetti, Sameer Sheshrao Gajghate, Utsab Banerjee, Sushanta K. Mitra and Elaine Maria Cardoso ()
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Jéssica Martha Nunes: Post-Graduation Program in Mechanical Engineering, School of Engineering, UNESP—São Paulo State University, Av. Brasil, 56, Ilha Solteira 15385-000, SP, Brazil
Jeferson Diehl de Oliveira: Department of Mechanical Engineering, FSG—University Center, Os Dezoito do Forte, 2366, Caxias do Sul 95020-472, RS, Brazil
Jacqueline Biancon Copetti: LETEF—Laboratory of Thermal and Fluid Dynamic Studies, UNISINOS—University of Vale do Rio dos Sinos, São Leopoldo 93022-750, RS, Brazil
Sameer Sheshrao Gajghate: Mechanical Engineering Department, G H Raisoni College of Engineering & Management, Pune 412207, Maharashtra, India
Utsab Banerjee: Micro & Nano-Scale Transport Laboratory, Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Sushanta K. Mitra: Micro & Nano-Scale Transport Laboratory, Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Elaine Maria Cardoso: Post-Graduation Program in Mechanical Engineering, School of Engineering, UNESP—São Paulo State University, Av. Brasil, 56, Ilha Solteira 15385-000, SP, Brazil

Energies, 2023, vol. 16, issue 7, 1-13

Abstract: Due to microscale effects, the segmented microchannels or micro pin fin heat sinks emerged as a high thermal management solution. In this context, the present work analyzes the influence of different heights of square micro pin fins with an aligned array and investigates their influence on pressure drop and heat transfer behavior. The HFE-7100 is used as the working fluid, and the pressure drop and surface temperature behavior are analyzed for different mass fluxes and inlet subcooling. The single-phase flow was analyzed numerically using the computational fluid dynamics (CFD) software ANSYS FLUENT ® for comparing the simulation results with the experimental data, showing that the highest micro pin fins configuration provides a more uniform and lowest wall temperature distribution compared to the lowest configuration. There is a good agreement between the experimental results and the numerical analysis, with a mean absolute error of 6% for all the considered parameters. For the two-phase flow condition, experimental tests were performed, and for the highest subcooling, an increase in mass flux causes an enhancement in the heat transfer for low heat flux; by increasing heat flux, there is a gradual predominance of boiling heat transfer over convection as the heat transfer mechanism. The pressure drop drastically increases with the vapor amount flowing into the system, regardless of the pin fin height; the boiling curves for the higher fin height show a much smaller slope and a smaller wall superheat than the fin with the smallest height, and consequently, a high heat transfer performance. A larger region of the heat sink is filled with vapor for lower inlet subcooling temperatures, degrading the heat transfer performance compared to higher inlet subcooling temperatures.

Keywords: convective boiling; two-phase flow; pin fin geometry; heat transfer coefficient; pressure drop (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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