Heat Transfer in Two-Dimensional Jet Impingement of a Dielectric Liquid on to a Flat Plate With Uniform Heat Flux

1992 ◽  
Author(s):  
C. B. Gil ◽  
G. S. Su ◽  
L. C. Chow ◽  
J. E. Beam
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Flat Plate ◽  
Jet Impingement ◽  
Dielectric Liquid ◽  
Uniform Heat Flux ◽  
Two Dimensional ◽  
Uniform Heat

Impinging Jet Cooling Optimization for Obtaining Uniform Heat Flux

2010 ◽  
Author(s):  
Farshad Kowsary ◽  
Hamed Gholamian ◽  
Mehran Rajaeeian Hoonejani
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Transfer Problem ◽  
Jet Impingement ◽  
Separation Distance ◽  
Uniform Heat Flux ◽  
Target Plate ◽  
Steady State Condition ◽  
Uniform Heat ◽  
Impingement Heat Transfer

In this study obtaining a uniform heat flux over a target surface was investigated by means of using characteristics of jet impingement heat transfer. Conjugate Gradients Method (CGM) was utilized to minimize the objective function defined on the basis of the squared differences between the target heat flux and the calculated ones. Design variables were taken to be jets’ Reynolds numbers, separation distance between the exit plane of the jets and the target plate, as well as inter-jet spacing. Air single phase jets were used in this study. The problem was solved for the cases of 4 and 6 jets. Temperature difference between the jet exit and the target plate is 100°C, and a steady state condition was assumed. The Finite Volume Method and an unstructured mesh were used for direct solution of the jet impingement heat transfer problem for a laminar jets impingement to a flat plate with constant temperature.

Heat Transfer and Mean Structure of a Turbulent Thermal Plume Along a Vertical Isothermal Wall

1978 ◽  
Vol 100 (2) ◽  
pp. 177-183 ◽  
Author(s):  
J. A. Liburdy ◽  
G. M. Faeth
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Natural Convection ◽  
Uniform Heat Flux ◽  
Thermal Plume ◽  
Local Similarity ◽  
Two Dimensional ◽  
Similarity Hypothesis ◽  
Uniform Heat ◽  
Wall Plume

This investigation considers a two-dimensional turbulent thermal plume rising along a smooth vertical wall which is cooled to the ambient temperature. Mean velocity and temperature profiles within the plume, and the heat flux to the wall, were measured for various plume strengths and distances above the source. Integral analysis suggested an approach to local similarity, based on the local values of the thermal energy flux in the plume and the height above the source, at the limit of large Reynolds number where the local skin friction coefficient and Stanton number can be assumed to be nearly constant. The use of the local similarity hypothesis provided correlations for profiles of mean quantities, comparable to similarity correlations observed for other two-dimensional plumes. The wall plume was found to have greater velocities and temperatures than a free-line plume, in spite of direct losses to the wall. The local similarity hypothesis also provided a satisfactory correlation of wall heat transfer rates. The Nusselt number correlation is Nux=1.344Rax*0.18;2×1010<Rax*<6×1012 for Pr = 0.71. This expression is similar to correlations for turbulent natural convection with uniform heat flux, in fact, the present values are within 20 percent of the values found for natural convection with uniform heat flux for this range of Rax*.

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