MEASUREMENT OF LOCAL TEMPERATURE GRADIENTS IN TURBULENT COMBUSTION SYSTEMS USING TWO-DIMENSIONAL LASER DIAGNOSTICS

1998 ◽  
Author(s):  
Friedrich Dinkelacker ◽  
Armin Soika ◽  
Dieter Most ◽  
Volker Holler ◽  
Alfred Leipertz
Keyword(s):  
Turbulent Combustion ◽  
Laser Diagnostics ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Two Dimensional ◽  
Combustion Systems

Relation between local temperature gradients and the direction of heat flow in quantum driven systems

2012 ◽  
Vol 407 (16) ◽  
pp. 3172-3174 ◽  
Author(s):  
Alvaro Caso ◽  
Liliana Arrachea ◽  
Gustavo S. Lozano
Keyword(s):  
Heat Flow ◽  
Temperature Gradients ◽  
Local Temperature ◽  
Driven Systems

Effects of plane progressive irrotational waves on thermal boundary layers

1971 ◽  
Vol 50 (2) ◽  
pp. 321-334 ◽  
Author(s):  
James Witting
Keyword(s):  
Boundary Layers ◽  
Deep Water ◽  
Maximum Amplitude ◽  
Capillary Waves ◽  
Temperature Gradients ◽  
Two Dimensional ◽  
Inviscid Incompressible Fluid ◽  
Mean Temperature ◽  
The Waves ◽  
Thermal Boundary Layers

The average changes in the structure of thermal boundary layers at the surface of bodies of water produced by various types of surface waves are computed. the waves are two-dimensional plane progressive irrotational waves of unchanging shape. they include deep-water linear waves, deep-water capillary waves of arbitrary amplitude, stokes waves, and the deep-water gravity wave of maximum amplitude.The results indicate that capillary waves can decrease mean temperature gradients by factors of as much as 9·0, if the average heat flux at the air-water interface is independent of the presence of the waves. Irrotational gravity waves can decrease the mean temperature gradients by factors no more than 1·381.Of possible pedagogical interest is the simplicity of the heat conduction equation for two-dimensional steady irrotational flows in an inviscid incompressible fluid if the velocity potential and the stream function are taken to be the independent variables.

Temperature Gradients in Turbulent Gas Streams - Behavior Near Boundary in Two Dimensional Flow.

1953 ◽  
Vol 45 (10) ◽  
pp. 2139-2145 ◽  
Author(s):  
S. D. Cavers ◽  
N. T. Hsu ◽  
W. G. Schlinger ◽  
B. H. Sage
Keyword(s):  
Temperature Gradients ◽  
Two Dimensional ◽  
Gas Streams ◽  
Dimensional Flow ◽  
Two Dimensional Flow

scholarly journals Some numerical experiments on firn ventilation with heat transfer

1993 ◽  
Vol 18 ◽  
pp. 161-165 ◽  
Author(s):  
M.R. Albert
Keyword(s):  
Heat Transfer ◽  
Surface Pressure ◽  
Thermal Effects ◽  
Numerical Experiments ◽  
Temperature Gradients ◽  
Pressure Amplitude ◽  
Two Dimensional ◽  
One Dimensional ◽  
Thermal Signature ◽  
Spatially Varying

Preliminary estimates of the thermal signature of ventilation in polar firn are obtained from two-dimensional numerical calculations. The simulations show that spatially varying surface pressure can induce airflow velocities of 10−5m s−1at 1.5 m depth in uniform firn, and higher velocities closer to the surface. The two-dimensional heat-transfer results generally agree with our earlier one-dimensional conclusions that the thermal effects of ventilation tend to decrease the temperature gradient in the top portions of the pack. Field observations of ventilation through temperature measurements are most likely to be observed when the firn temperature at depths on the order of 10 m is close to the air temperature, since steep temperature gradients can mask the thermal effects of ventilation. Preliminary indications are that, as long as surface-pressure amplitude is sufficient to move the air about in the top tens of centimeters in the snow, the resulting temperature profile during ventilation is fairly insensitive to the frequency of the surface-pressure forcing for pressure frequencies in the range 0.1–10.0 Hz.

Pulsated flow regime in fractures: a possible explanation of local temperature gradients in hydrothermal systems

Geothermics ◽  
1990 ◽  
Vol 19 (4) ◽  
pp. 329-339 ◽  
Author(s):  
Pierre-Olivier Grimaud ◽  
Gérard Touchard ◽  
Daniel Beaufort ◽  
Alain Meunier
Keyword(s):  
Flow Regime ◽  
Hydrothermal Systems ◽  
Temperature Gradients ◽  
Local Temperature
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