Momentum Balance Through Reducing Pipe Bend

[@205mlee]

At 2:39, is that dV a volume or velocity? Thanks

[@LearnChemE]

At 2:39, the integral is with respect to volume, so the dV is a volume term. sorry for the confusion.

[@205mlee]

Thank you!

[@MrLikeidontcare]

How do you know the direction of P2 is inwards? And why is that?

[@husnainhyder6713]

over all your lecture was great but one question where does this Frx and Fry meaning Fr=sqrt(Frx^2+Fry^2) is acting what is the location of action Thanks

[@elionaycaxinga4891]

Why isnt P2 in the direction of flow like P1?

[@MrLikeidontcare]

Can I not just equate FRx + P1 + P2costheta = 0 to find force in the x direction to hold it still?

[@bonnax07]

hello guys.. what is the pressure value that will be used, absolute or gage? thanks

[@rushi00717]

Hi....if you use Gauge pressure you will get resultant force on Bend....so it is the shorted way.... I am from India..

[@MrLikeidontcare]

also isnt this steady state flow?

[@劉昊鑫-k5m]

VERY USEFUL video!!!!!!!!!!!!!!!!!!

[@Sads626]

how did you know the normal was pointing out?

[@thebobhannah]

It's because of the convention that a flow entering the CV is positive and a flow exiting the CV is negative. I don't like how he explained it in this video. My teacher had us remember the word statement "the time rate of change of momentum enclosed in a CV = momentum flow rate entering CV - momentum flow rate exiting CV + the sum of forces acting on the CS (control surface)."