Radiation-conduction heat transfer in fibrous heat-resistant insulation under thermal effect

2008 ◽  
Vol 46 (1) ◽  
pp. 108-114 ◽  
Author(s):  
V. G. Zverev ◽  
V. D. Gol’din ◽  
V. A. Nazarenko
Keyword(s):  
Heat Transfer ◽  
Thermal Effect ◽  
Conduction Heat Transfer ◽  
Heat Resistant ◽  
Fibrous Heat

Thermal Management of Surface Mount Power Magnetic Components

1999 ◽  
Vol 122 (4) ◽  
pp. 323-327
Author(s):  
G. Refai-Ahmed ◽  
M. M. Yovanovich
Keyword(s):  
Heat Transfer ◽  
Power Loss ◽  
Numerical Study ◽  
Lower Surface ◽  
Experimental Results ◽  
Surface Mount ◽  
Conduction Heat Transfer ◽  
Magnetic Components ◽  
Underfill Material ◽  
Good Agreement

A numerical and experimental study of conduction heat transfer from low power magnetic components with gull wing leads was conducted to determine the effects of distributing the power loss between the core, the winding and the thermal underfill on the thermal resistance. The numerical study was conducted in the power loss ratio range of 0.5⩽PR⩽1.0, where the only active power loss was from the winding at PR=1. In addition, the effect of the thermal underfill material between the substrate and the lower surface of the magnetic package on the thermal performance of the magnetic device was also examined. For comparison, a test was conducted on a magnetic component at PR=1, without thermal underfill. This comparison revealed good agreement between the numerical and experimental results. Finally, a general model was proposed for conduction heat transfer from the surface mount power magnetic packages. The agreement between the model and the experimental results was within 8 percent. [S1043-7398(00)00704-0]

scholarly journals Temperature distribution in the three-layered upper mantle beneath a continent

2021 ◽  
Vol 2119 (1) ◽  
pp. 012006
Author(s):  
A G Kirdyashkin ◽  
A A Kirdyashkin ◽  
A V Borodin ◽  
V S Kolmakov
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Convective Heat Transfer ◽  
Upper Mantle ◽  
Lower Mantle ◽  
Transfer Equation ◽  
Horizontal Layer ◽  
Heat Transfer Equation ◽  
Continental Lithosphere ◽  
Conduction Heat Transfer

Abstract Temperature distribution in the upper mantle underneath the continent, as well as temperature distribution in the lower mantle, is obtained. In the continental lithosphere, the solution to the heat transfer equation is obtained in the model of conduction heat transfer with inner heat within the crust. To calculate the temperature distribution in the upper and lower mantle, we use the results of laboratory and theoretical modeling of free convective heat transfer in a horizontal layer heated from below and cooled from above.

Ensuring flat heat transfer in heat units of food production

2021 ◽  
pp. 20-23
Author(s):  
Николай Алексеевич Ермошин ◽  
Сергей Александрович Романчиков ◽  
Артем Николаевич Брагин
Keyword(s):  
Heat Transfer ◽  
Wear Resistance ◽  
Food Production ◽  
Heat Losses ◽  
Metal Powders ◽  
Heat Resistant ◽  
Gas Dynamic ◽  
Heat Resistant Coating ◽  
Point Source Of Heat ◽  
Fine Ceramics

Предлагается способ модификации тепловых блоков пищевых производств с точечным источником генерации теплоты, позволяющий обеспечить плоскостной принцип его передачи на стенки варочного сосуда. Способ обеспечивает повышенную износостойкость и жаропрочность стенок варочного сосуда и теплового блока за счет применения газодинамического напыления запатентованного состава специального покрытия, включающего коллоидный графит, оксид меди, каолин, металлические порошки и мелкодисперсную керамику. Раскрыт порядок нанесения покрытия на стенки теплового блока и варочного сосуда, приводятся физико-химические свойства исходных компонентов керамического жаростойкого покрытия, наносимого на внутренние стенки теплового блока. Предложены образцы теплового оборудования для подготовки исходных компонентов изготовления противоизносного жаростойкого защитного покрытия. Обоснованы условия реализации технических и технологических операций по нанесению покрытий. Исследованы зависимости и получены закономерности изменения теплопередачи и теплопотерь в тепловых блоках пищевых производств в зависимости от состава покрытия и его толщины. A method is proposed for modifying the thermal blocks of food production with a point source of heat generation, which allows to ensure the plane principle of its transfer to the walls of the cooking vessel. The method provides increased wear resistance and heat resistance of the walls of the cooking vessel and the heat block due to the use of gas-dynamic spraying of a patented composition of a special coating including colloidal graphite, copper oxide, kaolin, metal powders and fine ceramics. The procedure for coating the walls of the heating block and the cooking vessel is disclosed, and the physicochemical properties of the initial components of the ceramic heat-resistant coating applied to the inner walls of the heating block are presented. Samples of thermal equipment for the preparation of the initial components for the manufacture of antiwear heat-resistant protective coating are proposed. The conditions for the implementation of technical and technological operations for coating are substantiated. The dependences are investigated and the regularities of changes in heat transfer and heat losses in the thermal blocks of food production are obtained depending on the composition of the coating and its thickness.

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