# free stream temperature

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 November 30, 2000, 01:20 free stream temperature #1 qzhu Guest   Posts: n/a 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)?

 November 30, 2000, 08:03 Re: free stream temperature #2 Angus Duncan Guest   Posts: n/a 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! Angus sircorp, Dark_Shepard and BharathB like this.

 December 7, 2000, 10:37 Re: free stream temperature #3 Volker Pawlik Guest   Posts: n/a 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) sircorp, Dark_Shepard, Jianqi Shen and 1 others like this.

 December 8, 2000, 03:00 Re: free stream temperature #4 qzhu Guest   Posts: n/a Thank you for counsel. My calculation is carrying out well.

 December 8, 2000, 03:01 Re: free stream temperature #5 qzhu Guest   Posts: n/a Thank you for counsel. My calculation is carrying out well.

June 10, 2015, 03:55
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Shane
Join Date: Oct 2009
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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