CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Phoenics

Question on checking incell temperature at outlet

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   May 30, 2003, 14:34
Default Question on checking incell temperature at outlet
  #1
Guoqing
Guest
 
Posts: n/a
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

  Reply With Quote

Old   June 4, 2003, 17:50
Default Re: Question on checking incell temperature at out
  #2
John Ludwig, CHAM
Guest
 
Posts: n/a
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).
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
relative humidity and temperature by outlet Bing FLUENT 5 March 7, 2014 07:03
inlet temperature = outlet temperature Thierry FLUENT 4 March 17, 2006 11:14
Simple question about pressure outlet. Kiddo FLUENT 3 January 8, 2006 06:28
Setting of the outlet temperature Chinna FLUENT 0 November 29, 2003 13:42
Question about inlet and outlet BC babyface Main CFD Forum 1 January 15, 2003 10:17


All times are GMT -4. The time now is 03:11.