Dispersed flow film boiling
Author(s)Yoder, Graydon L.; Rohsenow, Warren M.
Massachusetts Institute of Technology. Division of Sponsored Research.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Heat Transfer Laboratory.
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Dispersed flow consists of small liquid droplets entrained in a flowing vapor. This flow regime can occur in cryogenic equipment, in steam generators, and during nuclear reactor loss of coolant accidents. A theoretical analysis of dispersed flow film boiling has been performed using mass, momentum and energy conservation equations for both phases. A numerical solution scheme, including wall-to-drop, vapor to drop, and wall-to-vapor heat transfer mechanisms was used to predict wall temperatures for constant heat flux, vertical upflow conditions. Wall temperature predictions were compared to liquid nitrogen, Freon-12 and water data of four separate investigators with reasonable results. A local conditions solution was developed by simplifying the governing equations, using conclusions from the numerical model. A non-dimensional group was found which solely determined the non-equilibrium with the flow, and allowed hand calculation of wall temperatures. The local conditions solution was compared to data taken by five investigators with good results.
Cambridge, Mass. : Heat Transfer Laboratory, Dept. of Mechanical Engineering, Massachusetts Institute of Technology, 
Technical report (Massachusetts Institute of Technology, Heat Transfer Laboratory) ; no. 103.