Material design of a film cooling system using experimental heat transfer data

2012 ◽  
Vol 55 (21-22) ◽  
pp. 6278-6284 ◽  
Author(s):  
Kyung Min Kim ◽  
Jiwoon Song ◽  
Jun Su Park ◽  
Sanghoon Lee ◽  
Hyung Hee Cho
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Cooling System ◽  
Material Design ◽  
Transfer Data ◽  
Experimental Heat ◽  
Experimental Heat Transfer

On free convection experiments in inclined air layers heated from below

1980 ◽  
Vol 96 (3) ◽  
pp. 461-479 ◽  
Author(s):  
Douglas W. Ruth ◽  
K. G. T. Hollands ◽  
G. D. Raithby
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Convective Motion ◽  
Secondary Transition ◽  
Transfer Data ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Air Layers ◽  
Rayleigh Numbers ◽  
Theory And Experiment

The heat transfer and free convective motion, in inclined air layers heated from below, for angles of incidence 0 [les ] ϕ [les ] 30°, and Rayleigh numbers 100 < Ra cos ϕ < 10000, are studied experimentally. Results of both heat-transfer measurements and flow-visualization studies are reported. The purpose of the study was to investigate the fact, first noted by Hollands et al. (1976), that the experimental heat-transfer data, for ϕ > 20°, is not a function of the product Ra cos ϕ only, as expected from theoretical consideration. This discrepancy between theory and experiment is here attributed to a hypothesized secondary transition in the convective motion, due primarily to perturbation velocities in the upslope direction. This secondary transition appears to be the same as that predicted theoretically by Clever & Busse (1977); qualitative agreement with their theory is observed.

Heat Transfer With Film Cooling Near Nontangential Injection Slots

1968 ◽  
Vol 90 (2) ◽  
pp. 157-162 ◽  
Author(s):  
D. E. Metzger ◽  
H. J. Carper ◽  
L. R. Swank
Keyword(s):  
Heat Transfer ◽  
Injection Site ◽  
Film Cooling ◽  
Surface Heat ◽  
Test Facility ◽  
Fluid Injection ◽  
Transfer Rates ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Secondary Fluid

A study of the effect of secondary fluid injection through single nontangential slots on the surface heat transfer in regions near the injection site is presented. The nondimensional parameters governing the heat transfer are obtained from the pertinent differential equations, and experimental results were obtained which cover the range of interest of these parameters for many situations encountered in film cooling applications. The experimental heat transfer rates were obtained from a novel transient test facility, and are presented as ratios of the heat transfer obtained with film injection to the heat transfer obtained with only the single mainstream.

Using Artificial Neural Networks to Develop a Predictive Method From Complex Experimental Heat Transfer Data

2001 ◽  
Author(s):  
Matthew D. Kelleher ◽  
Thomas J. Cronley ◽  
K. T. Yang ◽  
Mihir Sen
Keyword(s):  
Heat Transfer ◽  
Neural Networks ◽  
Artificial Neural Networks ◽  
Complex Situation ◽  
Transfer Data ◽  
Predictive Algorithm ◽  
Experimental Heat ◽  
Predictive Method ◽  
Experimental Heat Transfer ◽  
Artificial Neural

Abstract Artificial neural networks are employed to develop a predictive algorithm using experimental heat transfer data for a complex situation. The data of Marto and Anderson has used to illustrate the process. This data is from a series of experiments investigating the boiling heat transfer from a vertical bank of tubes in refrigerant 114 with variable amounts of oil present. Both finned and unfinned tubes were investigated. The network was trained with a partial set of the available data. The prediction obtained using the trained network was then compared to the remaining experimental data. The artificial neural network provided an excellent predictive method.

Condensation Heat Transfer Inside Multi-Port Minichannels

2004 ◽  
Author(s):  
A. Cavallini ◽  
D. Del Col ◽  
L. Doretti ◽  
M. Matkovic ◽  
L. Rossetto ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Research ◽  
Air Conditioning ◽  
Transfer Coefficients ◽  
Air Conditioners ◽  
Transfer Data ◽  
Heat Transfer Coefficients ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Residential Air Conditioning

In this paper the experimental heat transfer coefficients measured during condensation of R134a and R410A inside multiport minichannels are presented. The need for experimental research on condensation inside multiport minichannels comes from the wide use of those channels in automotive air-conditioners. The perspective for the adoption of similar channels in the residential air conditioning applications also calls for experimental research on new high pressure refrigerants, such as R410A. Heat transfer data are compared against models to show the accuracy of the models in the prediction of heat transfer coefficients inside minichannels.

scholarly journals Heat Transfer to the Highly Accelerated Turbulent Boundary Layer With and Without Mass Addition

1970 ◽  
Vol 92 (3) ◽  
pp. 499-505 ◽  
Author(s):  
W. M. Kays ◽  
R. J. Moffat ◽  
W. H. Thielbahr
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Turbulent Boundary Layers ◽  
Stanton Number ◽  
Temperature Profiles ◽  
Transfer Data ◽  
Experimental Heat ◽  
Prediction Scheme ◽  
Experimental Heat Transfer ◽  
Impermeable Wall

Experimental heat transfer data are presented for a series of asymptotic accelerated turbulent boundary layers for the case of an impermeable wall, and several cases of blowing, and suction. The data are presented as Stanton number versus enthalpy thickness Reynolds number. As noted by previous investigators, acceleration causes a depression in Stanton number when the wall is impermeable. Suction increases this effect, while blowing suppresses it. The combination of mild acceleration and strong blowing results in Stanton numbers which lie above the correlation for the same blowing but no acceleration. Velocity and temperature profiles are presented, from which it is possible to deduce explanations for the observed behavior of the Stanton number. A prediction scheme is proposed which is demonstrated to quite adequately reproduce the Stanton number results, using correlations derived from the profiles.

scholarly journals Heat Transfer Measurements for a Film Cooled Turbine Vane Cascade

2008 ◽  
Author(s):  
Douglas R. Thurman ◽  
Philip E. Poinsatte ◽  
James D. Heidmann
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Large Scale ◽  
Density Ratio ◽  
Computational Prediction ◽  
Thermochromic Liquid Crystal ◽  
Transfer Data ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Turbine Vane

Experimental heat transfer and pressure measurements were obtained on a large scale film cooled turbine vane cascade. The objective was to investigate heat transfer on a commercial high pressure first stage turbine vane at near engine Mach and Reynolds number conditions. Additionally blowing ratios and coolant density were also matched. Numerical computations were made with the Glenn-HT code of the same geometry and compared with the experimental results. A transient thermochromic liquid crystal technique was used to obtain steady state heat transfer data on the midspan geometry of an instrumented vane with 12 rows of circular and shaped film cooling holes. A mixture of SF6 and Argon gases was used for film coolant to match the coolant-to-gas density ratio of a real engine. The exit Mach number and Reynolds number were 0.725 and 2.7 million respectively. Trends from the experimental heat transfer data matched well with the computational prediction, particularly for the film cooled case.

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