determine the hydrodynamic torque component from the total torque

bejanyar · July 10, 2015, 14:46

Hello.
I know " torque_x()@disk " in a butterfly valve will give me the total torque.
It is correct ??
Now, i want to find hydrodynamic torque component from the total torque.
How can i do this ??
I found a below formula:
Td = T *(1-(p*/p))
But I dont know what mean P* or P ??

ghorrocks · July 11, 2015, 06:16

What is the hydrodynamic torque?

I have no idea what your formula means either. Try reading the reference you got it from.

bejanyar · July 11, 2015, 09:57

I refer you to this paper:
"A Numerical Study of the Flow through a Safety Butterfly Valve in a Hydro-Electric Power Scheme"
By : A. D. Henderson, J. E. Sargison, G. J. Walker and J. Haynes
Page 1120 in topic "Comparison with field measurements"
If you cant find it , i can send it to you.

ghorrocks · July 12, 2015, 06:01

I don't have time to read research papers on your topic. You are going to have to post enough information about the issue that we can answer it.

July 10, 2015, 14:46	determine the hydrodynamic torque component from the total torque	#1
bejanyar Member Hamidreza Bijanyar Join Date: Jun 2015 Posts: 40 Rep Power: 10	Hello. I know " torque_x()@disk " in a butterfly valve will give me the total torque. It is correct ?? Now, i want to find hydrodynamic torque component from the total torque. How can i do this ?? I found a below formula: Td = T (1-(p/p)) But I dont know what mean P* or P ??

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July 11, 2015, 06:16		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	What is the hydrodynamic torque? I have no idea what your formula means either. Try reading the reference you got it from.

July 11, 2015, 09:57		#3
bejanyar Member Hamidreza Bijanyar Join Date: Jun 2015 Posts: 40 Rep Power: 10	I refer you to this paper: "A Numerical Study of the Flow through a Safety Butterfly Valve in a Hydro-Electric Power Scheme" By : A. D. Henderson, J. E. Sargison, G. J. Walker and J. Haynes Page 1120 in topic "Comparison with field measurements" If you cant find it , i can send it to you.

July 12, 2015, 06:01		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I don't have time to read research papers on your topic. You are going to have to post enough information about the issue that we can answer it.