interesting problem of liquid surge

[ausengg]

so ive got this design problem of liquid surge in tanker.
scenario: the tanker on a truck is divided into two parts by baffle to stop liquid surge. The baffle is dome shaped. liquid level is same on both sides of the container. Design pressure rating for the baffle material is known. The question is what "acceleration or deceleration" would cause the baffle to buckle.
if any one could guide me on this or maybe suggest any reference for this problem, would be great.

 

[BigInch]

You must know your maximum acceleration and deceleration.
Combine that acceleration vector with the gravitational vector.
Determine the liquid surface angle under the combined acceleraton vector.
You know the mass of the liquid.
Force = mass x acceleration x height of liquid column
Pressure = Force/Area


Independent events are seldomly independent.

 

[desertfox]

Is there any technical information to go with your description or do we make it up ourselves

 

[SNORGY]

BigInch

I have no problem with your approach, but the calculation of force doesn't work dimensionally. Probably needs a "rho x g" in there somewhere (on the h term?). I suspect that was implied but just not completely spelled out.

Can the baffle buckle under a collision scenario?

 

[BigInch]

I was thinking that acceleration included g? Maybe I should have said "mass density" instead of "mass".

Independent events are seldomly independent.

 

[bimr]

The baffle may also buckle from vacuum if the vent was not opened when draining or steam cleaning of the tank

 

[ausengg]

thanks for replies everyone. im ignoring the vaccum condition for the time being but as pointed out it may buckle under this scenario as well. as for technical values we can choose practical values like 1300 for density of liquid and normal dimensions of a tanker, so ive made an exel file where i can change them as required.
i am thinking that the pressure due to acceleration of truck only is responsible for the buckling of the baffle and combining the gravity vector with acceleration vector to find the combined acceleration will only give us the max pressure force at some angle.
Ive used P=rho*accel*h, with P as the design pressure the baffle can withold which is known and ive worked for acceleration. The h value ive used is the horizontal length or height behind the baffle so essentially the same pressure formula but in the horizontal direction. any advise on whether this method is correct or not?

 

[BigInch]

I believe H should be coincident to the combined acceleration vector.

Independent events are seldomly independent.