Thermal Analysis of a Marine Products Irradiator and Its Transportation Cask

2004 ◽  
Author(s):  
Seik Mansoor Ali ◽  
Vishnu Verma ◽  
S. G. Markandeya ◽  
A. K. Ghosh ◽  
H. S. Kushwaha
Keyword(s):  
Thermal Analysis ◽  
Temperature Distribution ◽  
Air Temperature ◽  
Radiation Processing ◽  
Transient Thermal Analysis ◽  
Product Temperature ◽  
Marine Products ◽  
Accident Conditions ◽  
Transient Thermal

Irradiation of sea-foods is carried out in a marine products irradiator. During the radiation processing, it is required to maintain the product temperature within very narrow temperature limits. A transient thermal analysis of the irradiator (when in use) was carried out to determine the chilled air temperature and velocity required to maintain the product temperature within the specified range. In order to transport the irradiator cask with its contents, it is enclosed in an outer enclosure. The transportation cask is required to satisfy regulations pertaining to temperature distribution in various constituents. A transient thermal analysis of the transportation cask was carried out to determine the temperature distribution under normal and accident conditions (800°C external fire).

Transient thermal analysis of laser-assisted thermoplastic tape placement at high process speeds by use of analytical solutions

2017 ◽  
Vol 31 (3) ◽  
pp. 311-338 ◽  
Author(s):  
Thomas Weiler ◽  
Michael Emonts ◽  
Lukas Wollenburg ◽  
Henning Janssen
Keyword(s):  
Thermal Analysis ◽  
Temperature Distribution ◽  
Surface Temperature ◽  
Analytical Solutions ◽  
Process Analysis ◽  
Interface Temperature ◽  
Transient Thermal Analysis ◽  
Cooling Period ◽  
Bond Interface ◽  
Transient Thermal

This article presents a transient thermal analysis of laser-assisted thermoplastic tape placement at high process speeds. The article revises modeling simplifications made in the literature and introduces novel ones. Analytical solutions to the thermal problem are proposed, for the heating and the cooling period. The process analysis of high speeds assumes a high-power laser in combination with a well-functioning temperature control. Due to this assumption, the final (surface) temperature is kept equal in all analyzed cases. The process analysis will show that the through-thickness temperature distribution changes significantly at higher speeds and becomes the determining factor for the bond interface temperature. General conclusions about process design and limits of tape placement are drawn. Finally, novel control methods are presented, which promote a dual control of surface temperature and temperature distribution. It will be shown how this is achieved by appropriate setting of the laser power and heating length.

Transient Thermal Analysis of Epoxy-Impregnated Superconducting Windings in Linearly Ramped Fields

1978 ◽  
Vol 100 (4) ◽  
pp. 702-707 ◽  
Author(s):  
T. E. Laskaris
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Thermal Analysis ◽  
Temperature Distribution ◽  
Thermal Conductance ◽  
Eddy Current Losses ◽  
Transient Thermal Analysis ◽  
Transient Thermal ◽  
Current Carrying Capability ◽  
The Magnetic Field

Heat is generated in superconducting windings whenever the magnetic field changes. During these transient periods, the current carrying capability of the superconductor is limited by the temperature distribution inside the winding, especially in epoxy-impregnated winding composites that have limited thermal conductance. A finite-difference transient thermal analysis of a superconducting winding composite is presented. The analysis is employed to predict the critical current of a cylindrical coil and a modular racetrack winding under linear ramping of the magnetic field, when eddy current losses and hysteresis losses prevail. The dependence of these losses on the magnetic field and temperature is properly accounted for. The analytical predictions are compared to experimental data and the agreement is excellent.

Transient Thermal Analysis of a Space Reactor Power System

1993 ◽  
Vol 103 (1) ◽  
pp. 19-33
Author(s):  
Michael J. Gaeta ◽  
Frederick R. Best
Keyword(s):  
Thermal Analysis ◽  
Power System ◽  
Reactor Power ◽  
Transient Thermal Analysis ◽  
Space Reactor ◽  
Transient Thermal

Identification of thermo-mechanical fatigue fracture location by transient thermal analysis for high-temperature operating SiC power module assembled with ZnAl eutectic solder

2018 ◽  
Vol 2018 (HiTEC) ◽  
pp. 000028-000031 ◽  
Author(s):  
Fumiki Kato ◽  
Hiroki Takahashi ◽  
Hidekazu Tanisawa ◽  
Kenichi Koui ◽  
Shinji Sato ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Thermal Resistance ◽  
Thermal Cycle ◽  
Base Plate ◽  
Test Machine ◽  
Power Module ◽  
Eutectic Solder ◽  
Transient Thermal Analysis ◽  
The Individual ◽  
Transient Thermal

Abstract In this paper, we demonstrate that the structural degradation of a silicon carbide (SiC) power module corresponding to thermal cycles can be detected and tracked non-destructively by transient thermal analysis method. The purpose of this evaluation is to analyze the distribution of the thermal resistance in the power module and to identify the structure deterioration part. The power module with SiC-MOSFET were assembled using ZnAl eutectic solder as device under test. The individual thermal resistance of each part such as the SiC-die, the die-attachment, the AMCs, and the baseplate was successfully evaluated by analyzing the structure function graph. A series of thermal cycle test between −40 and 250°C was conducted, and the power modules were evaluated their thermal resistance taken out from thermal cycle test machine at 100, 200, 500 and 1000 cycles. We confirmed the increase in thermal resistance between AMCs and base plate in each thermal cycle. The portion where the thermal resistance increased is in good agreement with the location of the structural defect observed by scanning acoustic tomography (SAT) observation.

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