Abstract
The thermo-hydraulic behavior of inverted annular flow was investigated experimentally under various heat flux, inlet velocity, inlet subcooling and heating length conditions using freon 113. Empirical correlations are proposed concerning the net vaporization rate from the interface, heat flux from the interface to the liquid phase, interfacial shear stress and heat transfer coefficient from the wall to fluid. It is found that the roughness of the interface between the vapor film and liquid jet increases with the thickness of the vapor film and that an increase in the vapor film thickness causes the average Nusselt number and interfacial friction factor to rise linearly. On the other hand, the wall shear stress in inverted annular flow is lower than that in liquid single-phase flow due to the existence of a vapor film at the wall.
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