Friction factor and heat transfer in multiple microchannels with uniform flow distribution |
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| Authors: | Hee Sung Park Jeff Punch |
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| Affiliation: | 1. Laboratory of Thermodynamics in Emerging Technologies, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland;2. Advanced Micro Integration, IBM Research – Zurich, 8803 Rüschlikon, Switzerland;3. Department of Mechanical Engineering, University College London (UCL), Torrington Place, London WC1E 7JE, UK;1. Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran;2. Energy Research Institute, University of Kashan, Kashan, Iran;1. Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia;2. Mechanical Engineering Department, College of Engineering, Al-Mustansiriyah University, Iraq;3. Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia Kuala Lumpur, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia;4. Renewable Energies, Magnetism and Nanotechnology Lab., Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran |
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| Abstract: | Predictions of flow and heat transfer in microchannels are ongoing issues in microfludics. This work focused on laminar flow (69 < Re < 800) within rectangular microchannel with hydraulic diameter from 106 μm to 307 μm for single-phase liquid flow. The friction factors obtained by experiments on the microchannels showed that conventional theory for fully-developed flow is applicable within the range of our experiments. A manifold configuration which ensured uniform flow through the microchannel array is thought to contribute to the improvement of accuracy. The average Nusselt number for the microchannel array was also evaluated experimentally in the condition of constant heat transfer rate. We found that there were deviations between the experimental and theoretical values of heat transfer rate in the microchannels. In order to predict heat transfer rate accurately, we proposed an empirical correlation in terms of Nu/(Re0.62 Pr0.33) and Brinkman number confined to the experimental range. The correlation is expected to be useful to design the microchannel devices related to heat transfer. |
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