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Experimental determination of heat transfer in a Poiseuille-Rayleigh-Bénard flow

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Abstract

This paper deals with an experimental study of heat transfer in a Poiseuille-Rayleigh-Bénard flow. This situation corresponds to a mixed convection phenomenon in a horizontal rectangular channel uniformly heated from below. Flow visualisation and temperature measurements were achieved in order to describe the flow regimes and heat transfer behaviour. The classical measurement techniques such employing thermocouples give local measurement on one hand and on other hand they often disturb the flow. As the flow is three-dimensional, these techniques are not efficient. In order to not disturb the flow, a non-intrusive method is used for thermal measurement. The Planar laser Induced Fluorescence (PLIF) was implemented to determine thermal fields in the fluid. Experiments conducted for various Reynolds and Rayleigh numbers allow to determine the heat transfer and thus to propose correlation for Nusselt number for a mixed convection flow in Poiseuille-Rayleigh-Bénard configuration. First a description of the use of this technique in water flow is presented and then the obtained results for various Reynolds and Rayleigh numbers allow to propose a correlation for the Nusselt number for such configuration of mixed convection. The comparison between the obtained heat transfer and the pure forced convection one confirms the well-known result that the convective heat transfer is greatly enhanced in mixed convection. Indeed, secondary flow induced by buoyant forces contributes to the refreshment of thermal boundary layers and so acts like mixers, which significantly enhances heat transfer.

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Authors and Affiliations

  1. American University of the Middle East, Kuwait City, Kuwait

    R. Taher

  2. Aix Marseille University, CNRS, IUSTI, UMR 7343, 13453 Marseille cedex 13, France

    C. Abid

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  1. R. Taher
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  2. C. Abid
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Correspondence to C. Abid.

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Taher, R., Abid, C. Experimental determination of heat transfer in a Poiseuille-Rayleigh-Bénard flow. Heat Mass Transfer 54, 1453–1466 (2018). https://doi.org/10.1007/s00231-017-2220-3

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  • DOI: https://doi.org/10.1007/s00231-017-2220-3

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