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Numerical Study on the Forced Convection Heat Transfer of Nanofluids in Micro-Channels

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The objective of this numerical study is to examine the three-dimensional heat transfer of laminar single-phase flow in 215 μm wide and 821 μm deep rectangular micro-channels. The FLUENT computational fluid dynamics software is used to conduct simulations with saturated pure water and various water-based nanofluids, including Al2O3, CuO, and TiO2 nanoparticles. The accuracy of the previous correlations for nanofluid viscosity is assessed using the predicted friction factor data for those correlations in a comparison with experimental friction factor data. The computational model shows relatively good accuracy in capturing the heat transfer coefficient data measured for pure water and water-Al2O3 nanofluids. The local heat transfer coefficient increases as both the nanoparticle concentrations and total heat transfer rate increase, but it has a very weak dependence on the type of nanoparticle. The reason for this trend is the higher thermal conductivity that yields a higher heat transfer coefficient, especially for laminar flow. The uneven distribution of the local heat transfer rate caused by the axial heat conduction inside the solid block is observed along the micro-channel.
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Keywords: Conjugate Heat Transfer; Micro-Channel Heat Sink; Nanofluid

Document Type: Research Article

Affiliations: 1: School of Mechanical Engineering, Sungkyunkwan University, Suwon 400-746, Republic of Korea 2: Extreme Resources Plant R&D Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea

Publication date: 2017-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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