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  2. Von Kármán swirling flow - Wikipedia

    en.wikipedia.org/wiki/Von_Kármán_swirling_flow

    Von Kármán swirling flow is a flow created by a uniformly rotating infinitely long plane disk, named after Theodore von Kármán who solved the problem in 1921. [1] The rotating disk acts as a fluid pump and is used as a model for centrifugal fans or compressors.

  3. Homopolar generator - Wikipedia

    en.wikipedia.org/wiki/Homopolar_generator

    A homopolar generator is a DC electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A potential difference is created between the center of the disc and the rim (or ends of the cylinder) with an electrical polarity that depends on the direction of ...

  4. Ehrenfest paradox - Wikipedia

    en.wikipedia.org/wiki/Ehrenfest_paradox

    Ehrenfest considered an ideal Born-rigid cylinder that is made to rotate. Assuming that the cylinder does not expand or contract, its radius stays the same. But measuring rods laid out along the circumference should be Lorentz-contracted to a smaller value than at rest, by the usual factor γ. This leads to the paradox that the rigid measuring ...

  5. Revolving cylinder engine - Wikipedia

    en.wikipedia.org/wiki/Revolving_Cylinder_Engine

    Most revolving cylinder, axial piston engine designs utilize a fixed, multi-lobed barrel-type cam and rollers on the pistons to control the reciprocating movement of the pistons. [1] The benefit of this approach, versus a conventional crankshaft -and- connecting-rod mechanism, is that the kinematics of the piston motion can be optimized with ...

  6. How to Do a Free Reverse Phone Lookup & the 8 Best ... - AOL

    www.aol.com/finance/free-reverse-phone-lookup-8...

    By using a free reverse phone search service, you can enter the phone number that’s been calling you into a search engine and find out who owns that number. It’s a great way to find out if the ...

  7. Category:Rotating disc computer storage media - Wikipedia

    en.wikipedia.org/wiki/Category:Rotating_disc...

    The discs may be permanently attached to, or removable from, the computer. For large computer systems such as mainframes and server farms, the discs may be connected to a network, and thus may be situated physically distant from the computers they serve. In the latter setup, rotating discs tends to replace some magnetic tape data storage ...

  8. Flettner rotor - Wikipedia

    en.wikipedia.org/wiki/Flettner_rotor

    The Buckau, the first vehicle to be propelled by a Flettner rotor. A Flettner rotor is a smooth cylinder with disc end plates which is spun along its long axis and, as air passes at right angles across it, the Magnus effect causes an aerodynamic force to be generated in the direction perpendicular to both the long axis and the direction of airflow. [1]

  9. Contact AOL customer support - AOL Help

    help.aol.com/articles/account-management...

    Phone support is available for account management and password reset help, Mon-Fri: 8am-12am ET; Sat: 8am-10pm ET. For additional hours of operation for different services visit our support options page for contact info.