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-   -   Question on checking incell temperature at outlet (http://www.cfd-online.com/Forums/phoenics/51614-question-checking-incell-temperature-outlet.html)

Guoqing May 30, 2003 14:34

Question on checking incell temperature at outlet
 
I want to compare my calculated temperature at the outlet to my measured value. Could anyone take time and check if my procedure is ok.

I collected the following info from result file: Nett source of TEM1 at patch named: OB14 (OUTLET ) =-2.041E+04

Nett source of R1 at patch named: INLETI1 (INLETI1 ) = 6.867E-02

Nett source of R1 at patch named: OB14 (OUTLET ) =-6.867E-02

Parent VR object for this patch is: OUTLET

PATCH(OB14 ,HIGH , 17, 19, 17, 19, 27, 27, 1, 1)

COVAL(OB14 ,P1 , 1.000000E+00, 0.000000E+00)

COVAL(OB14 ,U1 , 0.000000E+00, SAME )

COVAL(OB14 ,V1 , 0.000000E+00, SAME )

COVAL(OB14 ,W1 , 0.000000E+00, SAME )

COVAL(OB14 ,KE , 0.000000E+00, SAME )

COVAL(OB14 ,EP , 0.000000E+00, SAME )

COVAL(OB14 ,TEM1, 0.000000E+00, SAME )

From one old thread, I found this to calculate nett source of Temp at the outlet:

S = TYPE*(Cp1*(Vp1-Pp)+CF) *(VF-Fp)

In my case, S is simplified as

s=TYPE*Pp*Fp=Cp * A *Pp*Fp (Cp=1005J/kg*S) ---I figured the nett source for Tem1 is watt

And A*Pp should be the out flow rate. Take R1 calculated from outlet, A*Pp=-0.06867 kg/s

therefor, the Fp is calculated as Fp=-2.041E4 / (-0.06867*1005)=295.74 or 22.59 celsius degree.

Thanks in advance


John Ludwig, CHAM June 4, 2003 17:50

Re: Question on checking incell temperature at out
 
This is basically correct. Units of TEM1 source are Watts, units of R1 source are kg/s, so average temperature is (TEM1 source)/(R1 source * Cp).


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