scholarly journals Discussion: “Heat Partition and Transient Temperature Distribution in Layered Concentrated Contacts. Parts I and II” (Rashid, M., and Seireg, A., 1987, ASME J. Tribol., 109, pp. 487–501)

1987 ◽  
Vol 109 (3) ◽  
pp. 502-502
Author(s):  
Lotfi El-Bayoumy
Keyword(s):  
Temperature Distribution ◽  
Transient Temperature ◽  
Transient Temperature Distribution ◽  
Heat Partition

Heat Partition and Transient Temperature Distribution in Layered Concentrated Contacts. Part II—Dimensionless Relationships and Numerical Results

1987 ◽  
Vol 109 (3) ◽  
pp. 496-501 ◽  
Author(s):  
M. Rashid ◽  
A. Seireg
Keyword(s):  
Temperature Distribution ◽  
Temperature Rise ◽  
Surface Coating ◽  
Numerical Results ◽  
Operating Conditions ◽  
Transient Temperature ◽  
Transient Temperature Distribution ◽  
Heat Partition ◽  
Recent Interest ◽  
Computer Based

The computer-based model described in Part I is utilized in this paper to develop dimensionless relationships for lubricated unlayered contacts and dry layered contacts. Because of the recent interest in tribological surface coating these relationships can be used to provide parametric evaluations of heat partition and temperature rise in the contacts under different coating parameters and operating conditions.

Heat Partition and Transient Temperature Distribution in Layered Concentrated Contacts. Part I—Theoretical Model

1987 ◽  
Vol 109 (3) ◽  
pp. 487-495 ◽  
Author(s):  
M. Rashid ◽  
A. Seireg
Keyword(s):  
Theoretical Model ◽  
Temperature Distribution ◽  
Heat Generation ◽  
Transient Temperature ◽  
Alternating Direction Implicit Method ◽  
Alternating Direction Implicit ◽  
Transient Temperature Distribution ◽  
Heat Partition ◽  
Alternating Direction ◽  
Computer Based

The study reported in this paper deals with the development of a generalized and efficient computer-based model for parametric evaluation of heat partition and transient temperatures in dry and lubricated layered concentrated contacts. The program utilizes finite differences with the alternating direction implicit method. It is capable of treating this general class of problems provided that the heat generation distribution and the layer properties and thicknesses are known.

Direct observation of three-dimensional transient temperature distribution in SiC Schottky barrier diode under operation by optical-interference contactless thermometry (OICT) imaging

2022 ◽  
Author(s):  
Keiya Fujimoto ◽  
Hiroaki Hanafusa ◽  
Takuma Sato ◽  
Seiichiro HIGASHI
Keyword(s):  
Temperature Distribution ◽  
Schottky Barrier ◽  
Hot Spot ◽  
Local Heating ◽  
Three Dimensional ◽  
Schottky Barrier Diode ◽  
Transient Temperature ◽  
Optical Interference ◽  
Transient Temperature Distribution ◽  
Heating And Cooling

Abstract We have developed optical-interference contactless thermometry (OICT) imaging technique to visualize three-dimensional transient temperature distribution in 4H-SiC Schottky barrier diode (SBD) under operation. When a 1 ms forward pulse bias was applied, clear variation of optical interference fringes induced by self-heating and cooling were observed. Thermal diffusion and optical analysis revealed three-dimensional temperature distribution with high spatial (≤ 10 μm) and temporal (≤ 100 μs) resolutions. A hot spot that signals breakdown of the SBD was successfully captured as an anormal interference, which indicated a local heating to a temperature as high as 805 K at the time of failure.

Measurement of Transient Temperature Distribution at Anode Surface After Current Zero in Vacuum Interrupter

2021 ◽  
Vol 141 (11) ◽  
pp. 712-717
Author(s):  
Akira Daibo ◽  
Yoshimitsu Niwa ◽  
Naoki Asari ◽  
Wataru Sakaguchi ◽  
Yo Sasaki ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Anode Surface ◽  
Transient Temperature ◽  
Vacuum Interrupter ◽  
Transient Temperature Distribution ◽  
Current Zero

scholarly journals Exact Solution of Heat Transport Equation for a Heterogeneous Geothermal Reservoir

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2935 ◽  
Author(s):  
Sayantan Ganguly
Keyword(s):  
Temperature Distribution ◽  
Transport Equation ◽  
Heat Transport ◽  
Transport Processes ◽  
Geothermal Reservoir ◽  
Transient Temperature ◽  
Thermal Front ◽  
Transient Temperature Distribution ◽  
Heat Transport Equation ◽  
Geothermal Aquifer

An exact integral solution for transient temperature distribution, due to injection-production, in a heterogeneous porous confined geothermal reservoir, is presented in this paper. The heat transport processes taken into account are advection, longitudinal conduction and conduction to the confining rock layers due to the vertical temperature gradient. A quasi 2D heat transport equation in a semi-infinite porous media is solved using the Laplace transform. The internal heterogeneity of the geothermal reservoir is expressed by spatial variation of the flow velocity and the effective thermal conductivity of the medium. The model results predict the transient temperature distribution and thermal-front movement in a geothermal reservoir and the confining rocks. Another transient solution is also derived, assuming that longitudinal conduction in the geothermal aquifer is negligible. Steady-state solutions are presented, which determine the maximum penetration of the cold water thermal front into the geothermal aquifer.

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