Abstract
Upstream injection of small gas bubbles causes increases of up to 50 per cent in heat-transfer coefficient for water flowing upward in a channel of rectangular cross-section. The increase depends on gas flow rate and liquid phase Reynolds number but not on heat flux, indicating that thermocapillary flows do not contribute to the heat transfer. A possible mechanism for the increase is secondary flow production by the interaction of bubbles with the shear flow near the wall.
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