Langlands decomposition: Difference between revisions

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en>JackSchmidt
m link product in case usage differs; certainly such a direct product decomposition does not exist for Borel subgroups of GL
 
en>K9re11
mNo edit summary
 
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In [[heat transfer]] and [[fluid dynamics]], the '''film temperature''' (<math>T_f</math>) is an approximation to the temperature of a fluid inside a [[convection]] [[boundary layer]]. It is calculated as the [[arithmetic mean]] of the temperature at the surface of the solid boundary wall (<math>T_w</math>) and the free-stream temperature (<math>T_\infty</math>):<ref>Incropera & DeWitt ''Fundamentals of Heat and Mass Transfer'', 4th Ed</ref>
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:<math>T_f=\frac{T_w + T_\infty}{2}</math>
 
The film temperature is often used as the temperature at which fluid properties are calculated when using [[Prandtl number]], [[Nusselt number]], [[Reynolds number]] or [[Grashof number]] to calculate a [[heat transfer coefficient]], because it is a reasonable first approximation to the temperature within the convection boundary layer.
 
Somewhat confusing terminology may be encountered in relation to [[boiler]]s and [[heat exchanger]]s, where the same term is used to refer to the limit (hot) temperature of a fluid in contact with a hot surface.<ref>[http://www.paratherm.com/tipsheets/tipsheet_fluid_life_film_temperature.asp Film Temperature]</ref><ref>[http://www.multitherm.com/technical_articles_bulk_film_temp_impact.html Bulk and Film Temperatures]</ref>
 
== References ==
<references/>
 
[[Category:Fluid dynamics]]
[[Category:Heat transfer]]

Latest revision as of 16:46, 9 November 2014

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