Experimental and numerical study of mixed convection with flow reversal in coaxial double-duct heat exchangers
- Laboratoire de Genie Civil et de Genie Mecanique (LGCGM), INSA de Rennes, IUT Saint Malo, 35043 Rennes (France)
- Faculte de genie, Universite de Sherbrooke, Sherbrooke, QC (Canada)
- Laboratoire d'Energie Appliquee, Ecole superieure Polytechnique, Dakar (Senegal)
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. (author)
- OSTI ID:
- 21030289
- Journal Information:
- Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 5 Vol. 32; ISSN 0894-1777; ISSN ETFSEO
- Country of Publication:
- United States
- Language:
- English
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