Film Condensation and Aerosol Deposition in Turbulent Flows with Noncondensable Gases

The object of this investigation is to resolve the discrepancy between theory and experiment for the case of heat transfer during film condensation of liquid metal vapors. Calculations from kinetic theory show that with liquid metals a significant thermal resistance can exist at the liquid-vapor interface. This resistance increases with decreasing vapor pressure and is dependent on the value of an accommodation coefficient, named the “condensation coefficient” in this case. Experimental work verifying this hypothesis of a liquid-vapor interfacial resistance is presented here for mercury condensing at low pressures in the absence of noncondensable gases on a vertical nickel surface.

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LES and an Efficient Lagrangian Tracking Method for Predicting Aerosol Deposition in Turbulent Flows

Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer ◽

10.1615/ichmt.2006.turbulheatmasstransf.1360 ◽

2006 ◽

Cited By ~ 1

Author(s):

M. Breuer ◽

G. Durmus ◽

E. A. Matida ◽

W. H. Finlay

Keyword(s):

Turbulent Flows ◽

Aerosol Deposition ◽

Tracking Method ◽

Lagrangian Tracking

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Turbulent film condensation in a vertical tube in presence of non condensable gas

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v6i3.1775 ◽

2014 ◽

Vol 6 (3) ◽

pp. 1282-1290

Author(s):

Belgassmi Youssef ◽

K. Gueraoui ◽

N. Hassanain ◽

A. Elbouzidi

Keyword(s):

Heat Flux ◽

Film Thickness ◽

Turbulent Flows ◽

Gas Flow ◽

Local Heat ◽

Vertical Tube ◽

Film Condensation ◽

Effect Of Temperature ◽

Methanol Vapour ◽

Local Heat Flux

This paper presents the simulation of the condensation of methanol vapour in the presence of non-condensable gas in turbulent flows in a vertical tube. The liquid and gas stream are approached by two coupled turbulent boundary layer. For solving the coupled governing equations for liquid film and gas flow together with the interfacial matching conditions an implicit finite difference method is employed. The effect of the influencing parameters are studied so the effect of inlet Reynolds number, the effect of temperature gradient, mass fraction are illustrated. The numerical results demonstrate that an important concentration of no-condensable gas reduces the heat transfer coefficient and film thickness considerably. The local heat flux and film thickness increase as tube surface temperature decreases at any bulk concentration of non-condensable gas. Moreover, inlet velocity increases as film thickness decreases and heat flux increases.

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An Integral Treatment of Laminar and Turbulent Film Condensation on Bodies of Arbitrary Geometrical Configuration

Journal of Heat Transfer ◽

10.1115/1.3247431 ◽

1985 ◽

Vol 107 (2) ◽

pp. 417-423 ◽

Cited By ~ 11

Author(s):

A. Nakayama ◽

H. Koyama

Keyword(s):

Turbulent Flows ◽

Solution Procedure ◽

Circular Cylinders ◽

Film Condensation ◽

Closed Form Expression ◽

Geometrical Configuration ◽

Flat Plates ◽

Inertia Effects ◽

Flow Acceleration ◽

Integral Treatment

A general solution procedure has been developed for laminar and turbulent film condensation problems. The procedure is designed to deal with both plane and axisymmetric isothermal bodies of arbitrary geometrical configuration. Inertia effects are fully considered by introducing a new parameter associated with the flow acceleration. A closed-form expression for the local Nusselt number is obtained for both laminar and turbulent flows. Calculations are carried out for laminar and turbulent condensate layers developed on flat plates, horizontal circular cylinders, and spheres. The results are compared with available predictions and measurements.

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