On Fluid Friction of Rotational Rough Disc in Rough Vessel

概要

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Though numerous studies of disc friction of smooth surface were already carried out, but the detail discussions of disc friction of rough surface have not yet been performed. Experiments were carried out for both cases of discs with smooth surface and rough surface, consisting of sand-grain of various size and shape. The main results obtained may be sumarized as follows : 1) Resistance Coefficient C_f in turbulent flow region tends to a certain value with increasing R_e for rough surface. 2) For a certain small value of clearance, coefficient C_f takes a minimum value. 3) Resisting moment of cast-iron disc is equal to that of the disc with rough surface IV. 4) When geometrical similarity is held for the dimension of apparatus, C_f depends on R_e only. 5) For increment value of resistance coefficient induced by roughness, the relations C_<f1>≒2C_<f2>≒4C_<f3> hold.
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