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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i4-6.10
pages 447-467

Fluid Dynamics and Heat Transfer in Annular Two-Phase Flow

Geoffrey F. Hewitt
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK

Краткое описание

The processes of evaporative heat transfer in annular flow are introduced and the associated hydrodynamic phenomena described. Predictions of evaporating, vertical annular flow are presented and compared with equivalent predictions for adiabatic equilibrium and condensing flows. The importance of departures from hydrodynamic equilibrium is demonstrated and discussed. A brief discussion is then given of annular flow in horizontal channels where the dynamic difference to vertical flow is that of the mechanism for maintaining the upper part of the tube wetted by the liquid phase. It is shown that the more likely mechanism for maintaining the liquid around the tube periphery is that of wave-induced transport. The mechanisms of heat transfer in annular flow are then discussed and the conventional picture of combined nucleate boiling and forced convection introduced. An attempt at rational prediction of the heat transfer coefficient behavior is described and shown to have inadequacies which are likely to arise from phenomena not accounted for in the conventional view. An experimental investigation is described in which evaporation and condensation are compared under equilibrium conditions. This shows that, in what is conventionally regarded as forced convection, evaporative heat transfer coefficients are considerably higher than those for condensation. This suggests that bubble evaporation is occurring in addition to convective heat transfer across the liquid film, probably associated with the occurrence of the large disturbance waves on the surface which have been shown to cause bubble entrainment, thus producing centers for bubble growth in the superheated liquid film. It is concluded that the conventional view of forced convective annular flow evaporation needs modification.


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