Film Boiling in a Forced-Convection Boundary-Layer Flow

1961 ◽  
Vol 83 (3) ◽  
pp. 370-375 ◽  
Author(s):  
R. D. Cess ◽  
E. M. Sparrow
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Skin Friction ◽  
Forced Convection ◽  
Practical Interest ◽  
Film Boiling ◽  
Convection Boundary Layer ◽  
Pure Liquid ◽  
Two Phase ◽  
Layer Flow

An analysis has been made to determine the heat transfer and friction characteristics in forced-convection film boiling on a flat plate. It is shown that the resulting two-phase flow problem can be formulated exactly within the framework of laminar boundary-layer theory. Solutions covering the parameter range of practical interest have been obtained by a combination analytical-numerical method. Heat-transfer and skin-friction results are presented both graphically and as simple, closed form analytical expressions. Relative to the case of pure liquid flow, the skin friction is substantially reduced due to film boiling. The heat transfer is found to increase as (ΔT)1/2, a much smaller dependence than in other convection phenomena.

scholarly journals Analytical solution of conjugate turbulent forced convection boundary layer flow over plates

2016 ◽  
Vol 20 (5) ◽  
pp. 1499-1507 ◽  
Author(s):  
Shariatzadeh Joneydi
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Analytical Solution ◽  
Forced Convection ◽  
Boundary Layer Flow ◽  
Finite Thickness ◽  
Convection Boundary Layer ◽  
Heated Plate ◽  
Convection Boundary ◽  
Layer Flow

A conjugate (coupled) forced convection heat transfer from a heated conducting plate under turbulent boundary layer flow is considered. A heated plate of finite thickness is cooled under turbulent forced convection boundary layer flow. Because the conduction and convection boundary layer flow is coupled (conjugated) in the problem, a semi-analytical solution based on Differential Transform Method (DTM) is presented for solving the non-linear integro-differential equation occurring in the problem. The main conclusion is that in the conjugate heat transfer case the temperature distribution of the plate is flatter than the one in the non-conjugate case. This feature is more pronounced under turbulent flow when compared with the laminar flow.

The Effect of Surface Motion on Forced Convection Film Boiling Heat Transfer

1989 ◽  
Vol 111 (3) ◽  
pp. 760-766 ◽  
Author(s):  
D. A. Zumbrunnen ◽  
R. Viskanta ◽  
F. P. Incropera
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Forced Convection ◽  
Flow Direction ◽  
Jet Impingement ◽  
Plate Motion ◽  
Film Boiling ◽  
Convection Boundary Layer ◽  
Continuous Annealing ◽  
Vapor Layer

The growth in demand for high-quality metallic alloys has placed greater emphasis on the predictability of cooling methods used in manufacturing processes. Several methods involve forced convection film boiling, which can occur on metallic strips or plates cooled by water jet impingement or on strips inside cooling jackets of continuous annealing processes. Since surface temperatures are typically well above the boiling point of water, a substantial portion of the surface area can involve film boiling. The strip or plate speed often exceeds the water velocities and strongly influences boundary layer development in the vapor and liquid. The purpose of this paper is to estimate the effect of plate motion on heat transfer in the film boiling regime. Conservation equations for mass, momentum, and energy have been solved by the integral method for film boiling in forced convection boundary layer flow on a flat isothermal plate in motion parallel to the flow direction. Unlike previous studies, which have shown that heat transfer is chiefly governed by the plate and subcooled liquid temperatures, heat transfer is shown to also depend on the plate velocity. For large velocities, the importance of radiation heat transfer across the vapor layer is reduced. However, when the velocities of the plate and liquid are oppositely directed and of nearly equal magnitude, radiation across the vapor layer can become significant, even at low plate temperatures.

scholarly journals Radiation Effect on Unsteady Mixed Convection Boundary Layer Flow, Heat and Mass Transfer over a Wedge

2016 ◽  
Vol 64 (1) ◽  
pp. 59-64 ◽  
Author(s):  
NC Roy ◽  
MN Firoza ◽  
AK Halder
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Mass Transfer ◽  
Mixed Convection ◽  
Skin Friction ◽  
Boundary Layer Flow ◽  
Convection Boundary Layer ◽  
Unsteady Mixed Convection ◽  
Flow Heat ◽  
Layer Flow

This paper concerns the unsteady mixed convection laminar boundary layer flow past a vertical wedge in the presence of thermal radiation. The governing equations have been solved by the straightforward finite difference method for the entire frequency range. We observe that the Richardson’s number, Ri, strongly affects the skin friction, heat transfer and mass transfer. The effect of the Schmidt number, Sc, on the mass transfer is significant, whereas the skin friction and the heat transfer are almost unaffected by it. Also the heat transfer is considerably dependent on the conduction-radiation parameter, Rd, but the influence of this parameter on the skin friction and the mass transfer is rather weak.Dhaka Univ. J. Sci. 64(1): 59-64, 2016 (January)

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