Laminar forced convection condensation

K. J. Renken, M. J. Carneiro, and K. Meechan, Analysis of Laminar Forced Convection Condensation within Thin Porous Coating, J. Thermophy. Heat Transfer, (8) 303-308,1994. 

FIGURE 14.9 Influence of acceleration and convection terms during laminar forced convection condensation on a vertical plate [38], (Reprinted with permission from Pergamon Press, Tarrytown, New York.)... 

Laminar Forced Convection. When the vapor moves in relation to the condensate, a shear stress xg will develop at the liquid-vapor interface. At very high vapor velocities, this shear... 

Specific correlations of individual film coefficients necessarily are restricted in scope. Among the distinctions that are made are those of geometry, whether inside or outside of tubes for instance, or the shapes of the heat transfer surfaces free or forced convection laminar or turbulent flow liquids, gases, liquid metals, non-Newtonian fluids pure substances or mixtures completely or partially condensable air, water, refrigerants, or other specific substances fluidized or fixed particles combined convection and radiation and others. In spite of such qualifications, it should be... 

When a plate on which condensation occurs is sufficiently large or there is a sufficient amount of condensate flow, turbulence may appear in the condensate film. This turbulence results in higher heat-transfer rates. As in forced-convection flow problems, the criterion for determining whether the flow is laminar or turbulent is the Reynolds number, and for the condensation system it is defined as... 

As was the case in forced convection involving a single phase, Iteat transfer ill condensation also depends on whether the condensate flow is laminar or turbulent. Again the criterion for the flow regime is provided by the Reynolds number, which is defined as... 

Laminar Free Convection. When a stagnant vapor condenses on a vertical plate, the motion of the condensate will be governed by body forces, and it will be laminar over the upper part of the plate where the condensate film is very thin. In this region, the heat transfer coefficient can be readily derived following the classical approximate method of Nusselt [12], Consider the situation depicted in Fig. 14.4 where the vapor is at a saturation temperature Ts and the plate surface temperature is T . Neglecting momentum effects in the condensate film, a force balance in the z-direction on a differential element in the film yields... 

S. B. Memory, V. H. Adams, and P. J. Marto, Free and Forced Convection Laminar Film Condensation on Horizontal Elliptical Tubes, Int. J. Heat Mass Transfer, 40, pp. 3395-3406,1997. 

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