Effects of internal conduction on the determination of heat transfer rates using thin film models

1974 ◽  
Vol 17 (2) ◽  
pp. 384-386 ◽  
Author(s):  
P.H. Oosthuizen
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Transfer Rates

APPLICATION OF ADSORPTION METHOD FOR DETERMINATION OF LOCAL CONVECTIVE HEAT TRANSFER RATES

1974 ◽  
Author(s):  
S. Koncar-Djurdjevic ◽  
M. Mitrovic ◽  
S. Cvijovic ◽  
G. Popovic ◽  
Dimitrije Voronjec
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Adsorption Method ◽  
Transfer Rates

Temperature measurements in a hypersonic gun tunnel using heat-transfer methods

1967 ◽  
Vol 27 (3) ◽  
pp. 503-512 ◽  
Author(s):  
B. E. Edney
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Mach Number ◽  
Heat Losses ◽  
Transfer Rates ◽  
Gun Barrel ◽  
Compression Cycle ◽  
Initial Shock ◽  
Working Section ◽  
Good Agreement

The theory of Fay & Riddell (1958) is used to calculate stagnation temperatures from stagnation-point heat-transfer rates measured in the working section of a hypersonic gun tunnel at a Mach number of 9·8. Measurements using both thin-film gauges and calorimeters are described. The temperatures measured using this technique are found to be lower than predicted by Lemcke (1962) from measurements of shock strengths and final pressures in the gun barrel. This discrepancy is attributed to heat losses in the barrel during the initial shock compression cycle. A simple theory is developed to take into account these losses. There is good agreement between this theory and the experimental results.

Experimental and Numerical Study of Evaporative Heat Transfer From Ten- Micro Microchannels

2006 ◽  
Author(s):  
Hoki Lee ◽  
T. A. Quy ◽  
C. D. Richards ◽  
D. F. Bahr ◽  
R. F. Richards
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Latent Heat ◽  
Numerical Study ◽  
Electrical Power ◽  
Three Dimensional ◽  
Working Fluid ◽  
Silicon Membrane ◽  
Transfer Rates ◽  
Evaporative Heat Transfer

Experimental and numerical results are presented for evaporative heat transfer from ten-micron square open-top channels. The radial channels are fabricated in epoxy photoresist on a two micron thick silicon membrane. The working fluid is pumped by capillary forces from a reservoir at the edge of the silicon membrane into the channels where it evaporates. The electrical power dissipated in a thin-film heater in the center of the membrane, the conduction heat transfer rate radially out of the membrane, and the rate of evaporation of the working fluid are measured. A three-dimensional finite difference, time-domain integration is used to predict sensible and latent heat transfer rates. Only 5-10% of the energy dissipated as heat in the thin film heater is carried away as latent heat by the evaporating working fluid. Computed temperatures and heat transfer rates are shown to match the experimental results.

Small Diameter Film Cooling Holes: Wall Convective Heat Transfer

1986 ◽  
Author(s):  
G. E. Andrews ◽  
M. Alikhanizadeh ◽  
A. A. Asere ◽  
C. I. Hussain ◽  
M. S. Khoshkbar Azari ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Small Diameter ◽  
Internal Heat ◽  
Metal Plate ◽  
Transfer Rates ◽  
Flow Heat ◽  
Available Information ◽  
Film Cooling Holes

The wall heat transfer resulting from small diameter holes drilled at 90° through gas turbine combustion chamber and turbine blade walls is considered. Available information is briefly reviewed and shown to generally omit the hole approach surface heat transfer and to relate only to the internal hole heat transfer. Experimental techniques are described for the determination of the overall heat transfer in a metal plate with a large number of coolant holes drilled at 90°. The results are compared with conventional short-tube internal heat transfer measurements and shown to involve much higher heat transfer rates and this mainly resulted from the additional hole approach flow heat transfer.

scholarly journals Small Diameter Film Cooling Holes: Wall Convective Heat Transfer

1988 ◽  
Author(s):  
G. E. Andrews ◽  
M. Alikhanizadeh ◽  
A. A. Asere ◽  
C. I. Hussain ◽  
M. S. Khoshkbar Azari ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Small Diameter ◽  
Internal Heat ◽  
Metal Plate ◽  
Transfer Rates ◽  
Flow Heat ◽  
Available Information ◽  
Film Cooling Holes

The wall heat transfer resulting from small diameter holes drilled at 90° through gas turbine combustion chamber and turbine blade walls is considered. Available information is briefly reviewed and shown to generally omit the hole approach surface heat transfer and to relate only to the internal hole heat transfer. Experimental techniques are described for the determination of the overall heat transfer in a metal plate with a large number of coolant holes drilled at 90°. The results are compared with conventional short-tube internal heat transfer measurements and shown to involve much higher heat transfer rates and this mainly resulted from the additional hole approach flow heat transfer.

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