Inside pipe wall temperature rise time t=?

tibor · September 2, 2017, 05:24

At time t=0 both the inside and outside temperature of pipe is at 21.1 degc (no fluids inside the pipe).

At time t=? , fluid flows inside the pipe carrying 427 deg c at velocity V.

My question is during the contact of fluid to inside wall pipe, will the inside wall temperature of the pipe will abruptly change from 21.2 deg C to 427 deg C ) Say at 1 sec?

Or is it gradual say 60 sec?

Can we run CFD to obtain this rise time inside the wall of pipe temperature? In case can run, what are data needed ,etc.?

Thanks a lot in advance ..

Or

W!ldejon · September 2, 2017, 11:27

It would change over time until everything reached the same temperature as the incoming fluid.

Could you keep it simple and start with the pipe full of fluid?
Set initial conditions to all volumes and run transiently, shouldn't take long

tibor · September 2, 2017, 22:54

Thanks for the info.. CFD Analysis is required in this face. Do you know some work around to estimate the heat transfer coefficient W/m^2-K of an incoming fluid at say 427 deg C and velocity V.

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tibor · September 17, 2017, 10:26

I already found how to calculate HTC using Ansys Fluent. My next question is "Is HTC time varying also"?.If yes , how to extract in Ansys Fluent?.Many thanks

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tibor · September 22, 2017, 11:59

We are all in the same page in this case

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tibor · September 22, 2017, 18:50

I finally found the answer.. it's only an average value.,

Sent from my iPhone using CFD Online Forum mobile app

September 2, 2017, 05:24	Inside pipe wall temperature rise time t=?	#1
tibor New Member tibor Join Date: Aug 2016 Posts: 8 Rep Power: 10	At time t=0 both the inside and outside temperature of pipe is at 21.1 degc (no fluids inside the pipe). At time t=? , fluid flows inside the pipe carrying 427 deg c at velocity V. My question is during the contact of fluid to inside wall pipe, will the inside wall temperature of the pipe will abruptly change from 21.2 deg C to 427 deg C ) Say at 1 sec? Or is it gradual say 60 sec? Can we run CFD to obtain this rise time inside the wall of pipe temperature? In case can run, what are data needed ,etc.? Thanks a lot in advance .. Or

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September 2, 2017, 11:27		#2
W!ldejon New Member Jon Wilde Join Date: Dec 2016 Posts: 25 Rep Power: 9	It would change over time until everything reached the same temperature as the incoming fluid. Could you keep it simple and start with the pipe full of fluid? Set initial conditions to all volumes and run transiently, shouldn't take long

September 2, 2017, 22:54		#3
tibor New Member tibor Join Date: Aug 2016 Posts: 8 Rep Power: 10	Thanks for the info.. CFD Analysis is required in this face. Do you know some work around to estimate the heat transfer coefficient W/m^2-K of an incoming fluid at say 427 deg C and velocity V. Sent from my iPhone using CFD Online Forum mobile app

September 17, 2017, 10:26		#4
tibor New Member tibor Join Date: Aug 2016 Posts: 8 Rep Power: 10	I already found how to calculate HTC using Ansys Fluent. My next question is "Is HTC time varying also"?.If yes , how to extract in Ansys Fluent?.Many thanks Sent from my iPhone using CFD Online Forum mobile app

September 22, 2017, 11:59		#5
tibor New Member tibor Join Date: Aug 2016 Posts: 8 Rep Power: 10	We are all in the same page in this case Sent from my iPhone using CFD Online Forum mobile app

September 22, 2017, 18:50		#6
tibor New Member tibor Join Date: Aug 2016 Posts: 8 Rep Power: 10	I finally found the answer.. it's only an average value., Sent from my iPhone using CFD Online Forum mobile app