Effects of Clearances and Grooves on Fluid Friction of Rotating Discs

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  • 回転円板の流体抵抗におよぼすすきまとみぞの影響
  • カイテン エンバン ノ リュウタイ テイコウ ニ オヨボス スキマ ト ミゾ ノ エイキョウ

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Abstract

Experiments on a rotating grooved disc in a closed grooved vessel, were carried out with various clearances, especially very small axial clearances, and over wider range of Reynold's number. From these results the effects of axial clearance S, pitch p and depth T of grooves on the resisting coefficient are determined as follows : (1) When the axial clearahces are very small and the surfaces are smooth, resisting coefficient Cf is in proportion to R6-5/6in larminar flow region, and to Re-1/4 in turbulent flow region, and independent of Re in transitional region. (2) Cf takes a minimum value at S/d≒0.0066, where d is the disc diameter, irrespective of the exsistance of grooves. In general, grooves have little infiuences on S/d. (3) Cf of smooth or grooved disc. in grooved vessel takes a minimum value, when p/d= 0.088, T/d=0.0066. The combination of a smooth disc and a grooved vessel is desirable in order to decreases Cf in larminar flow region. On the other hand, in turbulent flow region, the combination of a grooved disc and a grooved vessel is prefered.

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