Abstract
An experimental investigation of heat transfer from a flat plate to horizontal cocurrent airwater flow has been carried out to assess the effects of the different flow regimes on the effectiveness of the heat transfer. The results for smooth liquid film flow and two-dimensional wavy flow of the liquid phase are shown to agree with the theoretical analysis of heat transfer to smooth films. Three-dimensional waves and roll waves are shown to increase the Nusselt number (compared with smooth films) by more than 100 per cent. By using a surface-active agent to stabilize the flow direct comparison between wavy flow heat transfer and smooth flow heat transfer is obtained. At sufficiently low gas phase Reynolds numbers and at sufficiently high wall heat fluxes Rayleigh-like instability due to buoyant forces is shown to occur.
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