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=...
kamran's user avatar
  • 22.2k
1 vote

Can a fluid have more or less static pressure than atmospheric pressure in atmosphere?

The Bernoulli equation applies to conservative flow, meaning there is no added head or energy midstream. If there is a source or sink midway, it has to be accounted for. You are right. If you add ...
kamran's user avatar
  • 22.2k
1 vote

Can a fluid have more or less static pressure than atmospheric pressure in atmosphere?

You are forgeting a very important law and a very important equation, namely the Bernoulli equation. The Bernoulli equation is essentially an equation of conservation of energy. It goes: $p_{s} + p_{d}...
User198's user avatar
  • 113
1 vote

How to quantify a misty-ness of a spray?

The degree of atomization is assessed by measuring the droplet size distribution and plotting the result as a histogram. The size distribution is measured by scattering light off the cloud of spray, ...
niels nielsen's user avatar
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 ...
Solar Mike's user avatar
  • 15.6k
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.
Tiger Guy's user avatar
  • 6,813
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 ...
mechcad's user avatar
  • 523
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 ...
kamran's user avatar
  • 22.2k
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 ...
Ranulph teee's user avatar
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 ...
mechcad's user avatar
  • 523
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 ...
rockets_go_boom's user avatar
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 ...
Phil Sweet's user avatar
  • 4,707

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