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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>
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| 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.
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| 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>
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| == References ==
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| <references/>
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| [[Category:Fluid dynamics]]
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| [[Category:Heat transfer]]
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Latest revision as of 17:46, 9 November 2014
Hi there, I am Felicidad Oquendo. Playing crochet is a factor that I'm completely addicted to. Bookkeeping is what I do for a residing. My house is now in Kansas.
Also visit my webpage; maltarenting.com