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Thanks sreid and Benta. Benta do you now such kind of commercial air turbines? I would be grateful if you can provide a link about such air turbines or high speed drill.

Dear All I plan to design and construct an experimental setup with ball bearings which are capable of running to very high speeds as 150 000 -200 000 rpm with a rotor radius of 3-7.5 mm. I need the details of the electric motors that can be used for these range. I would be thankful to you if...

maybe permanent magnet synchronous motors (brushless) are helpful. can you provide a link for these kind of suppliers?

Dear All I plan to design and construct an experimental setup with ball bearings which are capable of running to very high speeds as 150 000 -200 000 rpm with a rotor radius of 3-7.5 mm. I need the details of the electric motors that can be used for these range. I would be thankful to you if...

Dear All I plan to design and construct an experimental setup with ball bearings which are capable of running to very high speeds as 150 000 -160 000 rpm with a rotor radius of 3-7.5 mm. A had a search in the internet and couldn t found any type of ball bearing capable of running to that high...

Dear btrueblood thanks for the links i will check the these. Dear IRstuff I know Magnus effect,but it happens when there is uniform flow also in my case as i told flow is generated only by the cylinder.

Hi All; I try to find the frictional torque on a high speed spindle. There is no flow past the cylinder, the flow is generated due the rotation of the cylinder. I read book of Munson and it is written there that this kind of flow can be modeled by a free votex approach. Is free vortex...

dear all I need to learn the basics of fluid structure interaction. Can you please recommend a book to study the basics? I need a simple book to learn the basic theory. Thanks