CONJUGATED HEAT TRANSFER IN DISC-TYPE POWER TRANSFORMER WINDINGS

1986 ◽  
Author(s):  
P. H. G. Allen ◽  
E. P. Childs
Keyword(s):  
Heat Transfer ◽  
Power Transformer ◽  
Conjugated Heat Transfer ◽  
Type Power

Conjugated Heat Transfer in Skirt Hot Box in Pressure Vessels

2006 ◽  
Author(s):  
Hossein Shokouhmand ◽  
Manoochehr Bozorgmehrian
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Temperature Gradient ◽  
Thermal Stresses ◽  
Weld Line ◽  
Pressure Vessels ◽  
Conductive Heat ◽  
Air Pocket ◽  
Cyclic Operation ◽  
Conjugated Heat Transfer

Pressure vessels are common equipment in oil, gas and petrochemical industries. In a hot containing fluid vessel, excessive temperature gradient at junction of skirt to head (weld line), can cause unpredicted high thermal stresses; Thereby fracture of the vessel may occur as a result of cyclic operation. Providing a hot box (air pocket) in crotch space is a economical, applicable and easy mounted method in order to reduce the intensity of thermal stresses. Natural convection due to temperature difference between the wall of pocket, will absorb heat near the hot wall (head of the vessel) and release that near the cold wall (skirt of the vessel), then the skirt wall conducts heat to the earth as a fin. This conjugated heat transfer removes the temperature gradient boundary at welded junction. This phenomena will lead the temperature gradient on the weld line from a sudden to smooth behavior, thereby the skirt-head junction, that is a critical region, could be protected from excessive thermal stresses. In this paper the profit of hot box and conjugated heat transfer in cavity has been demonstrated experimentally. As a result it is shown that the conductive heat transfer through the skirt (which acts as a fin) ensures the continuation of natural convection in the box. Also the governing equations has been solved numerically and compared with experimental results.

Conjugated heat transfer and temperature distributions in a gas turbine combustion liner under base-load operation

2010 ◽  
Vol 24 (9) ◽  
pp. 1939-1946 ◽  
Author(s):  
Kyung Min Kim ◽  
Namgeon Yun ◽  
Yun Heung Jeon ◽  
Dong Hyun Lee ◽  
Hyung Hee Cho ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Temperature Distributions ◽  
Conjugated Heat Transfer ◽  
Gas Turbine Combustion ◽  
Base Load

scholarly journals Analysis of conjugated heat transfer in micro-heat exchangers via integral transforms and non-intrusive optical techniques

2015 ◽  
Vol 25 (6) ◽  
pp. 1444-1462 ◽  
Author(s):  
Diego C. Knupp ◽  
Carolina Palma Naveira-Cotta ◽  
Adrian Renfer ◽  
Manish K. Tiwari ◽  
Renato M Cotta ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Integral Transforms ◽  
Optical Techniques ◽  
Conjugated Heat Transfer
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