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Passive Mixing and Convective Heat Transfer Enhancement for Nanofluid Flow across Corrugated Base Microchannels

Author

Listed:
  • Ali Ammar Naqvi

    (Department of Mechanical and Aerospace Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, OH 44106, USA)

  • Emad Uddin

    (Computational Mechanics Group, Department of Mechanical Engineering, School of Mechanical and Manufacturing Engineering (SMME), National University of Sciences and Technology, Islamabad 44000, Pakistan)

  • Muhammad Zia Ullah Khan

    (School of Computation, Information and Technology, Technical University Munich, 80333 München, Germany)

Abstract

Vortex generators and pin fins are conventionally used to deliver fluid mixing and improved convective heat transfer. The increased pressure loss following a fractional increase in heat transfer, as well as the complex manufacturing design, leave room for improvement. The present work proposes a novel diverging–converging base corrugation model coupled with vortex generation using simple geometrical modifications across rectangular microchannels to ensure a superior performance. The Nusselt number, friction factor, and flow phenomenon were numerically studied across a Reynolds number range of 50–1000. The optimum cross-section of the microchannel-generating vortices was determined after thorough study, and base corrugation was further added to improve heat transfer. For the vortex–corrugation modeling, the heat transfer enhancement was verified in two optimized cases: (1) curved corrugated model, (2) interacting corrugated model. In the first case, an optimized curve generating Dean vortices was coupled with base corrugation. An overall increase in the Nusselt number of up to 32.69% and the thermal performance of “1.285 TPF” were observed at a high Reynolds number. The interacting channels with connecting bridges of varying width were found to generate vortices in the counter-flow configuration. The thermal performance of “1.25 TPF” was almost identical to the curved corrugated model; however, a major decrease in pressure, with a loss of 26.88%, was observed for this configuration.

Suggested Citation

  • Ali Ammar Naqvi & Emad Uddin & Muhammad Zia Ullah Khan, 2023. "Passive Mixing and Convective Heat Transfer Enhancement for Nanofluid Flow across Corrugated Base Microchannels," Energies, MDPI, vol. 16(23), pages 1-23, December.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:23:p:7893-:d:1293254
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    References listed on IDEAS

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    1. Ebrahimi, Amin & Rikhtegar, Farhad & Sabaghan, Amin & Roohi, Ehsan, 2016. "Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids," Energy, Elsevier, vol. 101(C), pages 190-201.
    2. Jingnan Li & Li Yang, 2023. "Recent Development of Heat Sink and Related Design Methods," Energies, MDPI, vol. 16(20), pages 1-23, October.
    3. Jéssica Martha Nunes & Jeferson Diehl de Oliveira & Jacqueline Biancon Copetti & Sameer Sheshrao Gajghate & Utsab Banerjee & Sushanta K. Mitra & Elaine Maria Cardoso, 2023. "Thermal Performance Analysis of Micro Pin Fin Heat Sinks under Different Flow Conditions," Energies, MDPI, vol. 16(7), pages 1-13, March.
    4. Habibi Khalaj, Ali & Halgamuge, Saman K., 2017. "A Review on efficient thermal management of air- and liquid-cooled data centers: From chip to the cooling system," Applied Energy, Elsevier, vol. 205(C), pages 1165-1188.
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