Could not achieve the Constant Velocity?

Rajkool · March 11, 2021, 11:22

Hello all,

I am trying to simulate a simple two-conduit model. It is a straight double pipe with a length of 5 cm. I want to do thermal analysis at a constant velocity and check heat transfer for different velocities. But when I specify velocity inlet and outflow outlet or pressure outlet. There is an increase in the velocity at the outlet. I would like to take the suggestion to solve the issue and achieve the same velocity at the outlet as an inlet.

Thank you in advance
Raj

Yasser · March 14, 2021, 17:41

Does the density change with temperature?

Compare the mass flow rate at the inlet to that at the outlet. Only worry about mass imbalance.

Rajkool · March 16, 2021, 06:27

Yeah, density has a very slight change and can be ignored. But, in my model phase and velocity being constant is a priority as it is solidified melt.

March 11, 2021, 11:22	Could not achieve the Constant Velocity?	#1
Rajkool Member Raj Join Date: Jan 2020 Posts: 92 Rep Power: 6	Hello all, I am trying to simulate a simple two-conduit model. It is a straight double pipe with a length of 5 cm. I want to do thermal analysis at a constant velocity and check heat transfer for different velocities. But when I specify velocity inlet and outflow outlet or pressure outlet. There is an increase in the velocity at the outlet. I would like to take the suggestion to solve the issue and achieve the same velocity at the outlet as an inlet. Thank you in advance Raj

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March 14, 2021, 17:41		#2
Yasser Member Yasser Selima Join Date: Mar 2009 Location: Canada Posts: 51 Rep Power: 19	Does the density change with temperature? Compare the mass flow rate at the inlet to that at the outlet. Only worry about mass imbalance.

March 16, 2021, 06:27		#3
Rajkool Member Raj Join Date: Jan 2020 Posts: 92 Rep Power: 6	Yeah, density has a very slight change and can be ignored. But, in my model phase and velocity being constant is a priority as it is solidified melt.