Pipe Flow-Inlet temperature profile

selvam2487 · February 23, 2015, 16:47

Dear Friends,

I am doing LES of T-junction mixing flows. Hot fluid (in main pipe) is at 142 °C with 0.11 m/s velocity. Cold fluid (in branch pipe) is at 25 °C, flows at 0.08 m/s.

I have two questions with regard to my inflow boundary condition at hot pipe:
- Hot fluid flow is thermally stratified (about 14 °C between top and bottom of pipe) as seen from experimental data. Any suggestions on computationally incorporating this phenomenon into inflow boundary condition? I have temperature data at four angular positions (top, bottom,left and right).
- This is a follow up to the question above: Just as inflow velocity profile for developed flows, is there a defined inflow temperature profile (from top to bottom of pipe's cross-section)? It would be helpful if any references to literature are cited to learn about this topic.

Thank you for the help.

Regards,
Karthick

ghorrocks · February 24, 2015, 02:01

You can use a inlet profile for the thermal stratification, or define a CEL expression as a function of some dimension as two easy options.

Any question about thermal model should go straight to the seminal textbook on the are (well, at least the seminal textbook for me): Heat and Mass Trasfer by Incropera and DeWitt.

selvam2487 · February 26, 2015, 11:52

Dear Glenn,

Thank you for recommending Heat and Mass Transfer text book. It really has some very basic information that is very useful to me.

Regards,
Karthick

February 23, 2015, 16:47	Pipe Flow-Inlet temperature profile	#1
selvam2487 Member Karthik Join Date: Oct 2012 Location: Germany Posts: 53 Rep Power: 14	Dear Friends, I am doing LES of T-junction mixing flows. Hot fluid (in main pipe) is at 142 °C with 0.11 m/s velocity. Cold fluid (in branch pipe) is at 25 °C, flows at 0.08 m/s. I have two questions with regard to my inflow boundary condition at hot pipe: - Hot fluid flow is thermally stratified (about 14 °C between top and bottom of pipe) as seen from experimental data. Any suggestions on computationally incorporating this phenomenon into inflow boundary condition? I have temperature data at four angular positions (top, bottom,left and right). - This is a follow up to the question above: Just as inflow velocity profile for developed flows, is there a defined inflow temperature profile (from top to bottom of pipe's cross-section)? It would be helpful if any references to literature are cited to learn about this topic. Thank you for the help. Regards, Karthick

February 26, 2015, 11:52	Pipe inflow temperature profile	#3
selvam2487 Member Karthik Join Date: Oct 2012 Location: Germany Posts: 53 Rep Power: 14	Dear Glenn, Thank you for recommending Heat and Mass Transfer text book. It really has some very basic information that is very useful to me. Regards, Karthick

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February 24, 2015, 02:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	You can use a inlet profile for the thermal stratification, or define a CEL expression as a function of some dimension as two easy options. Any question about thermal model should go straight to the seminal textbook on the are (well, at least the seminal textbook for me): Heat and Mass Trasfer by Incropera and DeWitt.