Flow through a perforated drum

[ALREMAN]

Does anyone of a suggestion on how to estimate the flow of water through a perforated screen? I have a slowly rotating drum (1.2 rpm) 30" in diameter. I want to know how much water I can flow through it from the inside out. I will be pumping into it but it will drain by gravity flow. Any help would be appreciated.

Thanks!

 

[jari001]

Please describe the situation with more detail. Will it be pumped into the top of the drum or bottom of the drum? Will the drum drain while it's being filled from somewhere other than the screen surface area?

Maybe this will point you in the right direction.

 

[ALREMAN]

Thanks for the reply. I have uploaded a diagram of what I am working on. It is a screw chiller for olives. The idea is that the cold water comes in from a manifold in the bottom. The water flows through the outer shell into the perforated drum. Water dams prevent the water from short circuiting, so to get out it must go through the perforated drum first. The water will flow into then out of the perforated drum in a dewatering area. The drum turns very slowly so the olives have a retention time of 5 minutes. The water dams only go halfway up the drum, so if the flow is too high the water can spill over the top. The question I am trying to answer is how much flow can I push through the drum? Or, alternatively, what percent open do my perforations need to be for the flowrate I've chosen? The outer drum is 36" and the inner perf. drum is 30". I am going to extend the length a little to add a dead spot in the screen just before the dewatering area so that the water can pile up higher before dewatering. Otherwise the water level will rise and fall as the auger flights turn past the last water dam.

I hope this makes sense. Thanks for your time.

 

[bimr]

The volume of flow will be very large, but it is not possible to say without knowing the type of screen.

Huber makes these types of drum screens and may be able to assist.

http://www.huber-technology.com/pro...ra-fine-screens/huber-drum-screen-liquid.html