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free stream temperature

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Old   November 30, 2000, 01:20
Default free stream temperature
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qzhu
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Please teach me the following question: when I use the tempetature boundary conditions,for example convection wall , free stream temperature is required. Where is the "free stream temperature" ? For example, free stream temperature is a reference temperature in fluid field(indoor)? or,free stream temperature is a reference temperature in fluid field(outdoor)?
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Old   November 30, 2000, 08:03
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Angus Duncan
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The free stream temperature of your problem is the temperature of that fluid which is acting as the sink. For example, in the case of a utility boiler, the free stream temperature can be defined as the mean temp of the water/steam mixture rising in the wall tubes (away from the boundary layer). If no heat were being extracted from the system by this means then the external (environment) temp could be applied e.g. 273K in scotland!

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Old   December 7, 2000, 10:37
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Volker Pawlik
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Hi,

the free stream temperature is the temp. outside of your domain. It controls the heat transfer by the equation: heat transfer= heat transfer coefficient *(T_wall - T_free)
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Old   December 8, 2000, 03:00
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qzhu
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Thank you for counsel.

My calculation is carrying out well.

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Old   December 8, 2000, 03:01
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qzhu
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Thank you for counsel. My calculation is carrying out well.

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Old   June 10, 2015, 03:55
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Shane
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Quote:
Originally Posted by Volker Pawlik
;95603
Hi,

the free stream temperature is the temp. outside of your domain. It controls the heat transfer by the equation: heat transfer= heat transfer coefficient *(T_wall - T_free)
Thanks Volker Pawlik
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