Thermally developing flow and heat transfer in rectangular microchannels of different aspect ratios |
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| Affiliation: | 1. Department of Optimization of Chemical and Biotechnological Equipment, Saint-Petersburg State Institute of Technology (Technical University), Saint-Petersburg, Russia;2. Department of Mechanical Engineering, Indian Institute of Technology, Indore, India;1. ISE Research Group, Department of Thermal and Fluids Engineering, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganés, Madrid, Spain;2. GTADS Research Group, Department of Thermal and Fluids Engineering, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganés, Madrid, Spain;3. Associated Research Unit CSIC-Universidad Carlos III de Madrid, Spain;1. Alanya Alaaddin Keykubat University, Department of Air Conditioning and Refrigeration Technology, 07425, Alanya, Antalya, Turkey;2. Yeditepe University, Department of Mechanical Engineering, 34755, Atasehir, Istanbul, Turkey;3. Gebze Technical University, Department of Mechanical Engineering, 41400, Kocaeli, Turkey;1. RCUK National Centre for Sustainable Energy Use in Food Chain (CSEF), Brunel University London, Uxbridge, Middlesex UB8 3PH, UK;2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;3. Advanced Sustainable Manufacturing Technologies (ASTUTE 2020), College of Engineering, Swansea University, Swansea SA1 8EN, UK |
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| Abstract: | Laminar convective heat transfer in the entrance region of microchannels of rectangular cross-section is investigated under circumferentially uniform wall temperature and axially uniform wall heat flux thermal boundary conditions. Three-dimensional numerical simulations were performed for laminar thermally developing flow in microchannels of different aspect ratios. Based on the temperature and heat flux distributions obtained, both the local and average Nusselt numbers are presented graphically as a function of the dimensionless axial distance and channel aspect ratio. Generalized correlations, useful for the design and optimization of microchannel heat sinks and other microfluidic devices, are proposed for predicting Nusselt numbers. The proposed correlations are compared with other conventional correlations and with available experimental data, and show very good agreement. |
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