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-   -   Bulk temperature Tf is obtained from total or static temperature? (http://www.cfd-online.com/Forums/fluent/86683-bulk-temperature-tf-obtained-total-static-temperature.html)

NPU_conanxie March 30, 2011 05:56

Bulk temperature Tf is obtained from total or static temperature?
 
Hi, how are you? I have a question for your help.

Assume compressible idea-gas coolant flows into heated channel like turbine blade internal channel. BC: walls are given constant heat flux, inlet is given mass flow and total temperature, outlet is given pressure. Now I want to obtain the heat transfer coefficient, h=q/(Tw-Tf).

Generally the bulk temperature,Tf, is simply averaged by inlet and outlet temperature. Now, I just want to know, do the inlet and outlet temperature be referred to total temperature or static temperature? Or, Tf is averaged by inlet static temperature and outlet total temperature ?

Wall temperature,Tw refer to static temperature? If I choose static, the some of Tw are lower than the Tf.

Please help me charify the problems. Thank you.


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