Abstract
We measured the pressure distribution around eccentric rotating cylinders, of which the outer cylinder rotates, covering a wide range from a laminar flow to a fully developed turbulent flow in the case of various eccentricity ratios and clearance ratios. Water and glycerine-water solutions are used as working fluids, and pressure measurements are done under the condition that fluid pressure is increased in order to prevent the occurrence of cavitation. And we investigated experimentally the effects of eccentricity ratio and clearance ratio on pressure distribution and forceacting on the inner cylinder. The results obtained are as follows. (1) In the case where clearance ratio is relatively small, the theoretical pressure distribution ehich we reported previously is in good agreement with the measured one in a laminar flow region. (2) In a turbulent flow region, negative pressure occupies the greater part of clearance between the eccentric rotating cylinders. (3) An unstable flow between eccentric rotating cylinders was observed for certain clearance ratios β (β=0.04414 and 0.09413) in a transient region.
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