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The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory of relativity.. In its original 1909 formulation as presented by Paul Ehrenfest in relation to the concept of Born rigidity within special relativity, [1] it discusses an ideally rigid cylinder that is made to rotate about its axis of symmetry. [2]
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.
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The brake disc is the rotating part of a wheel's disc brake assembly, against which the brake pads are applied. The material is typically gray iron, [6] a form of cast iron. The design of the discs varies. Some are solid, but others are hollowed out with fins or vanes joining the disc's two contact surfaces (usually included in the casting ...
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A rotary atomizer comprises a rotating surface. This surface can be in the form of a flat or a vaned disc, a cup, or a slotted wheel. A basic rotary atomizer is displayed in the figure. The liquid first flows radially outwards in the disc and is then released from the disc's outer limits at a relatively very high speed.