Resistance to axial flow in cylinder under conditions of varying RPM and obstructions

[pratikpatilict]

Hi,

(I am a first time poster. If in your experience this question suits more to other forums please suggest me that)

I would to like to ask my question in series of increasingly complex scenarios.
1. A hollow cylinder (diameter/length = 1.585 and diameter = 0.5 m) with holes in its rear surface is rotating. Rotation is alternatively clockwise/anticlockwise at 50 RPM for most time of test and at 1400 RPM for short time in middle of run-time. Schematics for setup and RPM profile are as follows:-

Are there any correlations which will give me how such flow is related to pressure drop across cylinder as whole w.r.t. dimensionless parameters like Re and Taylor number. Any other literature reference is also appreciated.

2. Now if there is outer stationary cylinder around the rotating one, how would flow be divided and what would be resultant pressure drop. (I am interested in overall pressure-drop in flow through component). Again any reference to specific study is appreciated here. System is represented below:

3. Lastly (this may be asking a bit too much), what would happen if inner roatating cylinder has some labile solid sheet like substance which covers 60-70% volume of inner cylinder? I am assuming that more flow would go through annulus. Could a relation between obstructing substance's amount and partition of flow between two possible regions be formulated?

(please inform me if such detailed questions are not preferred/expected in this forum.)


Thank you,

 

[LittleInch]

A washing machine / dryer?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pratikpatilict]

Hi,
I originally asked this question. Yes, it is Dryer. I am trying to make Math model of it. Model consists of each physical component of machine. Each component is physical representation of momentum, energy, mass transports happening inside of it. But as opposed to CFD, here it is considered on lump-sum basis, rather than on FEM/FVM. This question is regarding momentum balance across Two concentric cylinder components inside the machine. I am trying understand if some correlation on component level for Pressure drop vs. flow characs could be obtained for these systems.

 

[IRstuff]

Is this for school? Someone, possibly you, posted these same 3 drawings in the last week. Student posting is not allowed.

TTFN
I can do absolutely anything. I'm an expert!
faq731-376 forum1529

 

[pratikpatilict]

Hi,
No, this is not for school. I posted the same question but accidentally put it in wrong forum. I reported that question and asked if could e routed to this forum. I got reply that I should just repost it in this forum. After that question posted on earlier forum was gone. And it is here now.

I am currently searching for literature on current problem. I posted to get some direction regarding that

 

[IRstuff]

OK. You never mentioned what the fluids involved are. You say "drying," so it's water? If it's a dryer, then I think you need holes on the cylinder wall, like a washing machine basket.

TTFN
I can do absolutely anything. I'm an expert!
faq731-376 forum1529

 

[pratikpatilict]

Hi,
Fluids I am considering is air (at around 100 C at entrance). In the case I am considering holes on inner cylinder's curved surface are blocked, since material to be dried covers much of the curved surface (especially during high RPM). So I am assuming that flow will occur mostly through rear holes. With that in mind, I am trying to find correlation for dP vs flow rate charac especially when inner cylinder is under high RPM