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Etude de l'Hydrodynamique et des Transferts de Chaleur dans des Microcanaux

Abstract : This doctoral thesis is devoted to the characterization of hydrodynamics and forced convection heat transfer for single phase liquid flows in micro-ducts. Extensive experiments have been conducted for determining the evolution of the friction coefficient, the heat transfer coefficient and the critical Reynolds number of transition to turbulence in microchannels from 700 µm to 5 µm in height. Local roughening of the microchannel walls has allowed for studying the influence of the surface finish on these three parameters. The findings of this research suggest that novel experimental techniques should be specifically developed for the scales smaller than 500 µm. Innovative silicon-pyrex microsystems composed of a microchannel and two local pressure probes have therefore been constructed. The experimental results show, contrary to previously published reference works, that the conventional laws established for macro-scaled flows pertain to smooth-wall microchannels. The roughness effect is also discussed both from experimental and analytical points of view. This latter analysis is founded on a model relying on the discrete element approach.
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Contributor : Roland Bavière Connect in order to contact the contributor
Submitted on : Thursday, September 29, 2005 - 12:03:19 PM
Last modification on : Friday, March 25, 2022 - 11:08:50 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:32:48 PM


  • HAL Id : tel-00010330, version 1




Roland Baviere. Etude de l'Hydrodynamique et des Transferts de Chaleur dans des Microcanaux. Dynamique des Fluides [physics.flu-dyn]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨NNT : ⟩. ⟨tel-00010330⟩



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