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)?

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

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)

Thank you for counsel.

My calculation is carrying out well.

Thank you for counsel. My calculation is carrying out well.

[sircorp]

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