Force on a plate (momentum question) 2

[flummoxed2002]

How do I calculate the force on a stationary plate that is impacted by a fluid at a mass flow rate of 20 tons/min and velocity of 60ft/s?

 

[FredRosse]

Force is equal to the mass flow rate times the change in velocity, the velocitys (in/out) are vector quantities.

For example: If the flow strikes the plate and turns 90 degrees, then the change in velocity is your 60 ft/sec, if it turns 180 degrees, then the change in velocity is 2 X the initial velocity.

The equation is dimensionally consistent in any rational system of units. If the units in the solution do not come out as a force, then your units are incorrect.

 

[KENAT]

f*t =delta m * v

Wouldnt' be homework would it?

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

What is Engineering anyway: faq1088-1484

 

[flummoxed2002]

Thank you everyone for your replies. This was a simplification of a problem I am working on. Needed confirmation that I was on the right track since I haven't looked into these types of things for some time now.

Thanks again!

 

[JStephen]

The solution from the fluids book involves the application of the Reynold's Transport Theorem to momentum, if I remember correctly.