5 votes

Limits of Euler-Bernoulli Beam Theory for Wide Plate in Flexure?

For a rectangular simply supported plate with length $a$ and width $b$ (Roark's Formulas for stress and strain): $$\sigma_{max} = \sigma_b= \frac{\beta qb^2} {t^2} $$ $\beta$ ranges from 0.287 for a=...
  • 21.2k
1 vote
Accepted

Routing the flow from an axial "box" fan

Converging ducts have been constructed for years. Often an exercise to work out the angle needed for lowest losses, about 6 degrees iirc. Aslo an exercise to calculate the shortest joint lines ...
  • 14.2k
1 vote

Pressure variation through reduction (Bernoulli) and pipe wall design

You can't design for a lower pressure in higher velocity sections of piping because you have to design for the zero flow pressure as well.
  • 4,913
1 vote

Is Bernoulli’s equation applicable for systems with pumps?

Solar Mike is correct, but requires more explanation why. The Bernoulli equation is an energy conservation law. The pump is imparting energy on the fluid, therefore, needs to be accounted for as a ...
  • 513
1 vote

Can I dismiss wind loads for this solar panel configuration?

Normally one would use ASCE 7-10 Wind Load Calculations for leeward roofs. $$p=qGCp−qi(GCpi) $$ Depending on the location, height, prevalent winds, zone, and some other factors you end up with a ...
  • 21.2k
1 vote

Venturi Duct flow

Hi sorry I was posting as a guest before and it signed me out so I have to answer instead of comment. It’s a duct where both ends are open and water is flowing in from converging end. Transitions are ...
1 vote
Accepted

Calculating Pipe Leak Flow Rate

This is a correct method, given you have a good estimate of the discharge coefficient (C). There are a lot of resources out there on estimates for C for an orifice in a cross flow configuration such ...
  • 513
1 vote

If a gas is pushed through a widening section of a pipe with a piston, will the pressure increase?

I'm going to assume the piston is moving subsonically here (since you indicated velocity decreases with increasing area). The key here is that the end of the pipe is not a closed boundary, so the ...
1 vote

Bernoulli equation on moving cart

I'm going to post this as an answer even though it isn't one. I was hoping the OP would post the actual substitutions into the Bernoulli equation to support their observation that you measure a ...
  • 3,695

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