Experimental and numerical study of mixed convection with flow reversal in coaxial double-duct heat exchangers - Archive ouverte HAL
Journal Articles Experimental Thermal and Fluid Science Year : 2008

Experimental and numerical study of mixed convection with flow reversal in coaxial double-duct heat exchangers

Abstract

Velocity vectors in a vertical coaxial double-duct heat exchanger for parallel ascending flow of water under conditions of laminar mixed convection have been determined experimentally using the particle image velocimetry technique. The measured velocity distributions for large annular flow rates, resulting in an essentially isothermal environment for the stream in the inner tube, are in very good agreement with corresponding numerical predictions. For flow rates of the same order of magnitude in the inner tube and the annulus, and corresponding temperature differences of about 20 °C, experimental observations show that flow reversal occurs simultaneously in both streams over large axial distances for both heating and cooling of the flow in the inner tube.

Dates and versions

hal-02149862 , version 1 (06-06-2019)

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Thierry Mare, Nicolas Galanis, Ionut Voicu, Jacques Miriel, Ousmane Sow. Experimental and numerical study of mixed convection with flow reversal in coaxial double-duct heat exchangers. Experimental Thermal and Fluid Science, 2008, 32 (5), pp.1096-1104. ⟨10.1016/j.expthermflusci.2008.01.002⟩. ⟨hal-02149862⟩
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