Bias effects on heat transfer measurements in microchannel flows |
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| Affiliation: | 1. Laboratoire des Ecoulements Géophysiques et Industriels, CNRS-UJF-INPG, 1025 rue de la Piscine, BP 53 X, 38041 Grenoble Cedex, France;2. Centre de Recherches sur les Très Basses Températures, CNRS B.P. 166, 38042 Grenoble Cedex 09, France;1. School of Power and Energy, Northwestern Polytechnical University, You Yi Xi Lu 127, 160#mailbox, Xi''an 710072, China;2. University of Stuttgart, Institute of Aerospace Thermodynamics, Pfaffenwaldring 31, 70569 Stuttgart, Germany;3. Department of Mechanical & Electrical Engineering, Xi''an University of Architectural & Technical, Yan Ta Lu 13, 3#mailbox, Xi''an 710055, China;1. Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, Technion City 32000, Israel;2. Rafael, Haifa 3102102, Israel |
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| Abstract: | This work is devoted to both experimental and numerical investigations of the hydrodynamics and associated heat transfer in two-dimensional microchannels from 700 μm to 200 μm in height. The design of the test section enabled to vary the channel height and to set a quasi-constant heat flux at the microchannel surface. Laminar developing, transitional and turbulent regimes of water flows were explored (200 < Re < 8000). A significant decrease in the Nusselt number was observed in the laminar regime when the channel spacing was decreased while the Poiseuille number remained unchanged in regard to conventional channel flow. It is shown that a bias effect in the solid/fluid interface temperature measurements is most likely responsible for this scale effect. The temperature error was estimated and accounted for in the determination of the Nusselt number. The corrected values have been found to be consistent with the conventional laws both in the laminar and in the beginning of the turbulent regime. |
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