Search found 375 matches

by admin
Sun Aug 08, 2010 9:27 am
Forum: Flow calculators and fluid flow problems
Topic: Gas Flow In Small Pipe
Replies: 3
Views: 5575

Re: Gas Flow In Small Pipe

I still don't have calculator for this kind of problem but you can read theory at: Discharge through valves, fittings and pipes http://www.pipeflowcalculations.com/pipeflowtheory/discharge_through_valves_fittings_and_pipes.htm and for expansion factor Y please find formula for orifices at: Flow thro...
by admin
Fri Aug 06, 2010 9:01 pm
Forum: Flow calculators and fluid flow problems
Topic: Gas Flow In Small Pipe
Replies: 3
Views: 5575

Re: Gas Flow In Small Pipe

You must tell me the pressure difference from start to finish to calculate flow rate.
I think that 8 bar is on the start, and what do you have on the end - a tank or atmosphere or cylinder?
by admin
Fri Aug 06, 2010 7:27 pm
Forum: Flow calculators and fluid flow problems
Topic: FLOWRATE CALCULATIONS
Replies: 1
Views: 3582

Re: FLOWRATE CALCULATIONS

Here you have simple pressure drop calculator and it can be used to calculate water flow rate as well:
http://www.pipeflowcalculations.com/pre ... /index.htm
by admin
Fri Aug 06, 2010 7:25 pm
Forum: Flow calculators and fluid flow problems
Topic: Car Exhaust Diameter Flow Question
Replies: 3
Views: 11141

Re: Car Exhaust Diameter Flow Question

My opinion is the best solution is to have no car exhaust pipe at all if you want highest power :) Now as this is not a option, than you are trying to get close to it - which is pipe should be as big as possible, but, Flow through car exhaust is by no means stationary - it is oscillating with time v...
by admin
Thu Aug 05, 2010 7:46 am
Forum: Flow calculators and fluid flow problems
Topic: P in pipe that goes up 18' then back down...
Replies: 4
Views: 6815

Re: P in pipe that goes up 18' then back down...

For that height the pressure will be above evaporation point for the normal temperatures (20-30 OC). In order to start the circulation energy (head) on one side must be higher than energy (head) on the other. It can be achieved with pump or with level difference between two tanks. In the second case...
by admin
Thu Aug 05, 2010 7:34 am
Forum: Flow calculators and fluid flow problems
Topic: losses thru a valve
Replies: 3
Views: 5960

Re: losses thru a valve

This problems in my opinion can be solved only by experiment.
Calculation is maybe possible but with very limited accuracy.

Maybe using numerical methods some better results can be obtained but again, some experiment is also required - that is what I think.
by admin
Tue Aug 03, 2010 7:28 am
Forum: Flow calculators and fluid flow problems
Topic: losses thru a valve
Replies: 3
Views: 5960

Re: losses thru a valve

The calculator for air pressure drop http://www.pipeflowcalculations.com/airflow/index.htm can be used with value of resistance coefficient - K entered. Value for K can be obtained from the valve manufacturer or found in literature. If you can tell me more about the valve - type of valve (globe, gat...
by admin
Mon Aug 02, 2010 10:00 pm
Forum: Flow calculators and fluid flow problems
Topic: Venturi Expansion Factor and Discharge Coefficient
Replies: 6
Views: 11490

Re: Venturi Expansion Factor and Discharge Coefficient

As fluid is considered as incompressible no expansion factor is included in calculator, for this time but will be soon.

For the second point you are right of course and it will be indicated more clearly. Thank you for your analysis.
by admin
Mon Aug 02, 2010 7:49 pm
Forum: Flow calculators and fluid flow problems
Topic: Venturi Expansion Factor and Discharge Coefficient
Replies: 6
Views: 11490

Re: Venturi Expansion Factor and Discharge Coefficient

And just to point out following: I have two questions that I would appreciate if any one help me to find their answers. let's start. The discharge coefficient used for venturi in the calculator is: Cd=a+b.(Ln Re)^2+c.(Ln Re)^3 and apparently the expansion factor used for it, is: Buckingham Eq: Y=1-(...