×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Dynamics of a tank

Dynamics of a tank

Dynamics of a tank

(OP)
I am designing a rectangular that will be on a trailer and would like to know where to determine the forces due to liquid sloshing when stopping.

How do I determine these forces?

JL

RE: Dynamics of a tank

Maybe consider putting some baffles in the tank to settle things down a bit.
 

RE: Dynamics of a tank

(OP)
I will be putting baffles but I am trying to model/determine the forces created when stopping the trailer the tank will sit on.
a) forces on the tank's walls
b) forces transmitted onto the trailer

JL

RE: Dynamics of a tank

Hmmm interesting questions, my 2 cents at worst case (with out going into kinetic analysis) would be to calculate the g load when stopping and then multiply that by the mass of the fluid and then divide that number by the area of half the tank.  This will at least get you to a pressure on the walls on the front part of the tank and then you can calc out your stress on the walls.  At least this will be my first pass just to see what the numbers might be.

Does it have to be rectangular?  There are equations for stress for cylinder tanks.
 

Tobalcane
"If you avoid failure, you also avoid success."
"Luck is where preparation meets opportunity"  

RE: Dynamics of a tank

Of course the pressure would havee a gradient. For  1G deceleration (not a bad assumption for worst case), imagine the tank tilted forward 45 deg and gravity increased by 40%.

Engineering is the art of creating things you need, from things you can get.

RE: Dynamics of a tank

(OP)
My tank needs to be rectangular. Approx 8'x8' x 30" high. Will be on a trailer and built to DOT and UN standards. Tank will have baffles to diffuse the energy created by sloshing but I was curious to see if simple formulas existed for a equivalent force applied when braking.

JL

RE: Dynamics of a tank

Any high school physics textbook will have all the equations you would need to determine "equivalent force applied when braking".

Determining what to do with that number you have calculated might require referencing some college-level textbooks, or class notes.

RE: Dynamics of a tank

Without looking at the literature on the subject, my first inclination would be to treat it like a fire hose shooting water against a wall; this would give an initial and maximum pressure equal to Bernouli's formula for stagnation pressure.

p=rho*V^2/2g

where I assume a sudden stoppage of the vehicle.



 

RE: Dynamics of a tank

(OP)
Quite useful although Appendix F is missing some pages

JL

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources