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Theses

Modélisation de l'hydrodynamique et des transferts de chaleur dans des microcanaux à parois rugueuses.

Abstract : The objective of this thesis was to determine the effect of roughness on the flow and the heat transfers in microchannels. We carried out three-dimensional numerical simulations in order to characterize the interactions between the single-phase liquid flow and the rough elements. These calculations revealed that the flow in the rough near wall region can be modelled as two-dimensional. Consequently, 2D numerical simulations were employed in order to determine the drag and heat transfer coefficients. These results were used in a one-dimensional model RLM (Rough Layer Model) based on the discrete elements method. The friction coefficient in a rough microchannel resulting from the RLM model was compared with the experimental results obtained for microchannels with roughness elements of controlled form and distribution. This comparison showed a good agreement between the two approaches. This means that the influence of roughness in microchannels is not changed when compared to the influence observed in conventional size ducts. The analysis of the results showed that the influence of roughness depends on the local geometrical parameters (porosity and fractionation) when the relative height of the roughness elements (k/0.5H) is lower than 0.5. We also showed the possibility to employ RLM model in order to determine the thermal performance of micro heat exchangers equipped with pin fins.
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https://tel.archives-ouvertes.fr/tel-00172333
Contributor : Gabriel Gamrat <>
Submitted on : Friday, September 14, 2007 - 6:59:01 PM
Last modification on : Thursday, November 19, 2020 - 3:54:10 PM
Long-term archiving on: : Friday, April 9, 2010 - 2:14:06 AM

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  • HAL Id : tel-00172333, version 1

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Gabriel Gamrat. Modélisation de l'hydrodynamique et des transferts de chaleur dans des microcanaux à parois rugueuses.. Dynamique des Fluides [physics.flu-dyn]. Institut National Polytechnique de Grenoble - INPG, 2007. Français. ⟨tel-00172333⟩

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