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Heat Transfer Enhancement of TiO 2 /Water Nanofluids Flowing Inside a Square Minichannel with a Microfin Structure: A Numerical Investigation

Author

Listed:
  • Budi Kristiawan

    (Department of Mechanical Engineering, Engineering Faculty, Universitas Sebelas Maret, Kampus UNS Kentingan, Jl. Ir. Sutami 36A Kentingan, Surakarta 57126, Indonesia)

  • Agung Tri Wijayanta

    (Department of Mechanical Engineering, Engineering Faculty, Universitas Sebelas Maret, Kampus UNS Kentingan, Jl. Ir. Sutami 36A Kentingan, Surakarta 57126, Indonesia)

  • Koji Enoki

    (Deparment of Mechanical Engineering and Intelligent System, University of Electro-communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan)

  • Takahiko Miyazaki

    (Department of Energy and Environmental Engineering, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan
    International Institute for Carbon-Neutral Energy Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan)

  • Muhammad Aziz

    (Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan)

Abstract

A combination of two passive heat transfer enhancement techniques using a microfin structure and nanofluids was investigated numerically. TiO 2 /water nanofluids flowing inside a square minichannel with a microfin structure (SMM) were observed as a practical application. Increased heat transfer performance was investigated by observing the Nusselt number, friction factor, and performance evaluation criterion (PEC). Velocity and temperature profiles were also demonstrated at a laminar developing flow regime. The SMM used in this work had six microfins (N = 6) and TiO 2 /water nanofluids with various nanoparticle concentrations of 0.005, 0.01, and 0.1 vol.%. By combining nanofluids as working fluids and SMM as a passive heat transfer enhancement, the maximum PEC value of 1.2 was achieved at Re = 380 with a volume fraction of 0.01 vol.%. It is obvious that compared to water flowing inside the square minichannel microfin, the heat transfer can be increased by using only a nanofluid with a volume fraction of 0.01%. The combination of a microfin and nanofluids as working fluids is strongly recommended due to its excellent performance in terms of heat transfer and economic considerations.

Suggested Citation

  • Budi Kristiawan & Agung Tri Wijayanta & Koji Enoki & Takahiko Miyazaki & Muhammad Aziz, 2019. "Heat Transfer Enhancement of TiO 2 /Water Nanofluids Flowing Inside a Square Minichannel with a Microfin Structure: A Numerical Investigation," Energies, MDPI, vol. 12(16), pages 1-21, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:16:p:3041-:d:255488
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    References listed on IDEAS

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    1. Budi Kristiawan & Budi Santoso & Agung Tri Wijayanta & Muhammad Aziz & Takahiko Miyazaki, 2018. "Heat Transfer Enhancement of TiO 2 /Water Nanofluid at Laminar and Turbulent Flows: A Numerical Approach for Evaluating the Effect of Nanoparticle Loadings," Energies, MDPI, vol. 11(6), pages 1-15, June.
    2. Gupta, Munish & Singh, Vinay & Kumar, Rajesh & Said, Z., 2017. "A review on thermophysical properties of nanofluids and heat transfer applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 638-670.
    3. Agung Tri Wijayanta & Pranowo & Mirmanto & Budi Kristiawan & Muhammad Aziz, 2019. "Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert," Energies, MDPI, vol. 12(2), pages 1-12, January.
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    Cited by:

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    2. Ali Motevali & Mohammadreza Hasandust Rostami & Gholamhassan Najafi & Wei-Mon Yan, 2021. "Evaluation and Improvement of PCM Melting in Double Tube Heat Exchangers Using Different Combinations of Nanoparticles and PCM (The Case of Renewable Energy Systems)," Sustainability, MDPI, vol. 13(19), pages 1-19, September.
    3. Piotr Bogusław Jasiński & Michał Jan Kowalczyk & Artur Romaniak & Bartosz Warwas & Damian Obidowski & Artur Gutkowski, 2021. "Investigation of Thermal-Flow Characteristics of Pipes with Helical Micro-Fins of Variable Height," Energies, MDPI, vol. 14(8), pages 1-18, April.

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