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Investigation of heat transfer in a microchannel with same heat capacity rate

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Abstract

In this paper, a new experimental setup was proposed to realize the constant-heat-flux boundary condition based on a counter flow microchannel heat exchanger with the same heat capacity rate of the hot and cold streams. This approach provides a constant fluid temperature gradient along the surfaces. An analytical two-dimensional model was developed to describe the heat transfer processes in the hot stream and the cold stream, respectively. In the experiments, DI-water was employed as the working fluid. Laser induced fluorescence (LIF) method was used to measure the fluid temperature field within the microchannel. Different combinations of flow rates were studied to investigate the heat transfer characteristics in the microchannel. The measured mean temperature distribution matched well with the proposed analytical model. A correlation for Nusselt number (Nu) was proposed based on the experimental Reynolds number (Re < 1) and Prandtl number (Pr).

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Authors and Affiliations

  1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China

    Bin Xu

  2. School of Mechanical and Aerospace, Nanyang Technological University, 50 Nanyang, Avenue, Singapore, 639798, Singapore

    Teck Neng Wong

  3. Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Brisbane, 4111, Australia

    Nam-Trung Nguyen

Authors
  1. Bin Xu
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  2. Teck Neng Wong
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  3. Nam-Trung Nguyen
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Correspondence to Bin Xu.

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Xu, B., Wong, T.N. & Nguyen, NT. Investigation of heat transfer in a microchannel with same heat capacity rate. Heat Mass Transfer 55, 899–909 (2019). https://doi.org/10.1007/s00231-018-2477-1

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