Abstract
Experimental results are presented for heat transfer and turbulent transport in heated vertical circular tubes in the presence of mixed convection at Re = 5100 and 9000. For the first time the measurements of turbulent transports ( u′v′ and u i′T′ ) were made. It is shown that turbulent heat transport near the wall is suppressed to a greater degree than momentum transport, being thus responsible for a sharp reduction in heat transfer with a slight change in the friction coefficient. Buoyancy forces influence turbulence differently over the cross-section—the suppression of turbulence near the wall and its generation in the flow core. The anisotropy of longitudinal and radial turbulent heat transport is shown to undergo the reversal of sign in the flow core.
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