Doubts in pipe turbulent flow theoretical analysis calculation

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August 3, 2018, 15:41
Doubts in pipe turbulent flow theoretical analysis calculation
#1
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Aakash
Join Date: Aug 2018
Posts: 3
Rep Power: 7
Hello,

I need to analysis the pipe routings by theoretically, I have done some major loss (Darcy Weisbach eq) and minor loss fittings calculation.

But I don't know the exact calculations becuase I am not an expert in fluid mechanics.

I have attached image please look at that, give me your golden suggestions

Attached Images
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 August 3, 2018, 15:50 #2 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,689 Rep Power: 66 You just write a system of equations in terms of the major and minor losses. But your system is under-defined at the moment. You need to know the flow splits or the pressures at the outlets to solve this problem. E.g. where you have flow & pressure? at each outlet, you need to know one or the other for each. Ajithmahi likes this.

 August 3, 2018, 16:58 #3 New Member   Aakash Join Date: Aug 2018 Posts: 3 Rep Power: 7 Thankyou for quick response luckytran, Actually i want to find that things. For example how i am expecting : inlet 60 lpm it has some static pressure and additionally we given 1 bar pressure at inlet. it moves towards the outlet with some major and minor losses, so i have assumed to subtract the losses. eg. 1 bar pressure it will decrease to 0.4 bar due to friction and fittings. and also we need to apply pressure energy Potential energy for lift to outlet 3. Bernoulli's equation. etc. may we can assume in all outlet is atm pressure. Thanks

August 5, 2018, 19:01
#4
Senior Member

Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,689
Rep Power: 66
Quote:
 Originally Posted by Ajithmahi may we can assume in all outlet is atm pressure.

Right... you need to know something more. Otherwise, knowing only the inlet conditions is not enough. Can you assume all the outlets are at atmospheric pressure? I don't know, you are the one specifying the problem.

 August 6, 2018, 05:01 #5 New Member   Aakash Join Date: Aug 2018 Posts: 3 Rep Power: 7 Could you please briefly explain, What is the approach & what is the input required to solve this kind of problem? Could you tell me some sample example problem? That would be very useful to me. Thanks in Advance. Last edited by Ajithmahi; August 7, 2018 at 03:35.

 August 8, 2018, 15:18 #6 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,689 Rep Power: 66 I've written it twice already. Repeatedly asking the same question won't make me change my answer... You have three outlet pipes. You need to know the pressures at each outlet. Maybe they are all equal and all atmospheric, maybe they are different. They are something. Or you need to know the flowsplits. I.e. does is it 1/3, 1/3, 1/3 or maybe 1/5, 2/5, 3/5, or whatever. Ajithmahi likes this.

 Tags calculation, cfd - post, fluid mechanics, formulas, theoretical

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