The backflow hydraulic diameter of a double volute centrifugal pump

Ahmed Saeed Mansour · March 3, 2016, 21:51

How can I calculate the backflow hydraulic diameter of a double volute centrifugal pump to enter it in the boundary conditions in Fluent?

https://www.google.com.eg/search?q=d...u0CvytI4X9M%3A

LuckyTran · March 5, 2016, 20:55

What you need to specify is the turbulence in case there is reverse flow. It may help to think of it as your k and epsilon or k and omega.

Note that if there is not any reverse flow (which I don't think there should be in a pump) then the backflow properties will never be used except at intermediate iterations.

Ahmed Saeed Mansour · March 7, 2016, 06:34

Quote:

Originally Posted by LuckyTran

What you need to specify is the turbulence in case there is reverse flow. It may help to think of it as your k and epsilon or k and omega.

Note that if there is not any reverse flow (which I don't think there should be in a pump) then the backflow properties will never be used except at intermediate iterations.

I know that the hydraulic diameter is 0.015 m but I don't know what is the formula to know how to calculate it?

March 3, 2016, 21:51	The backflow hydraulic diameter of a double volute centrifugal pump	#1
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	How can I calculate the backflow hydraulic diameter of a double volute centrifugal pump to enter it in the boundary conditions in Fluent? https://www.google.com.eg/search?q=d...u0CvytI4X9M%3A

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March 5, 2016, 20:55		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,754 Rep Power: 66	What you need to specify is the turbulence in case there is reverse flow. It may help to think of it as your k and epsilon or k and omega. Note that if there is not any reverse flow (which I don't think there should be in a pump) then the backflow properties will never be used except at intermediate iterations.