Abstract:Experimental measurement of viscous drag is done on a rotating disc using a disc spin-down experiment in various air pressures ranging from atmospheric pressure through a vacuum pressure of 0.3 kPa. The torque is non-dimensionalized using the dynamic viscosity of air, angular velocity, and the characteristic dimension of the disc. The results can be classified as two different sets. Between atmospheric pressure and 13.3 kPa, the curves have a vertical downward trend and are connected to each other while at low… Show more
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