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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

BACKFLOW IN THE INLET REGION OF OPPOSING MIXED CONVECTION HEAT TRANSFER IN A VERTICAL TUBE

Get access (open in a dialog) DOI: 10.1615/IHTC10.3290
pages 489-494

要約

Flow patterns generated by buoyancy effects in mixed convection heat transfer to water in a steam-jacketed vertical tube were investigated in this work. Axially moveable thermocouple probes were used to obtain local, dynamic and steady state temperature measurements in the flow. Forced-flow Reynolds numbers ranged from 0-2400 at Grashof number 5×l07 based on tube diameter and bulk fluid properties. In downflow heating, backflow of hot, large-scale turbulent eddies existed in both the boundary layer and the bulk flow near the entrance (top) of the heated section of the tube. The intensity of these flow patterns decreased as forced-flow Reynolds number increased. The results provide experimental verification of some aspects of surface renewal theory and show that the pre-entrance region can also play a role in these flows.