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

Budi Kristiawan, Agung Tri Wijayanta, Koji Enoki, Takahiko Miyazaki and Muhammad Aziz
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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
Muhammad Aziz: Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

Energies, 2019, vol. 12, issue 16, 1-21

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.

Keywords: titania; nanofluids; mixture model; square minichannel; microfin (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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