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Experimental Study of the Viscous Pump with a Helical Channel Rotor:torsion effect of the Channel

Journal of Thermal Science 2010年第2期19卷 154-159页

作者： Yasutaka HAYAMIZU Kyoji YAMAMOTO Shinichiro YANASE Toru HYAKUTAKE Shinichi MORITA Shigeru OHTSUKA Department of Mechanical Engineering Yonago National College of Technology4448 Hikona-choYonago-shiTottori 683-8502 Graduate School of Natural Science and Technology Okayama University3-1-1 TushimanakaOkayama-shiOkayama 700-8530

The viscous pump,which has a rotor with a helical square channel,is studied *** non-dimen-sional channel curvature is taken to be about *** types of torsion of the channel are made to investigate the torsion effect on the flow *** measure the flux through the channel at a constant rotor speed by changing the pressures at the entrance and exit of the *** also observe the secondary flow at a cross-section of the *** of the results obtained are shown as follows:The friction factor along the channel to get the same flux is large for large channel torsion at a constant rotation,and becomes small when the favorable rotation of the rotor to the flow is *** for the secondary flow in a cross-section,there appear several types of *** there is no rotation,the secondary flow is almost a symmetric two-vortex type for small flux as is the ordinary Dean vortex,but it changes to a four-vortex type when the flux is *** secondary flow becomes asymmetric as the rotation is *** have unsteady flow patterns at large flux and rotation.

关键词： Viscous Pump Helical Channel torsion effect Secondary Flow Flow Visualization Dean Number Taylor Number

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Experimental Study of the Flow in Helical Circular Pipes:torsion effect on the Flow Velocity and Turbulence

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Journal of Thermal Science 2008年第3期17卷 193-198页

作者： Yasutaka HAYAMIZU Kyoji YAMAMOTO ShinichiroYANASE Toru HYAKUTAKE Toru SHINOHARA Shinichi MORITA Department of Mechanical Engineering Yonago National College of Technology Graduate School of Natural Science and Technology Okayama University

An objective of the present paper is to experimentally clarify the torsion effect on the flow in helical circular pipes. We have made six helical circular pipes having different pitches and common non-dimensional curvature δ of about 0.1. The torsion parameter β0, which is defined by β0 = τ/（2δ）1/2 with non-dimensional torsion r, are taken to be 0.02, 0.45, 0.69, 1.01, 1.38 and 1.89 covering from small to very large pitch. The velocity distributions and the turbulence of the flow are measured using an X-type hot-wire anemometer in the range of the Reynolds number from 200 to 20000. The results obtained are summarized as follows： The mean secondary flow pattern in a cross section of the pipe changes from an ordinary twin-vortex type as is seen in a curved pipe without torsion （toroidal pipe） to a single vortex type after one of the twin-vortex gradually disappears as β0 increases. The circulation direction of the single vortex is the same as the direction of torsion of the pipe. The mean velocity distribution of the axial flow is similar to that of the toroidal pipe at small β0, but changes its shape as β0 increases, and attains the shape similar to that in a straight circular pipe when ,β0 = 1.89. It is also found that the critical Reynolds number, at which the flow shows a marginal behavior to turbulence, decreases as ,β0 increases for small ,β0, and then increases after taking a minimum at ,β0 ≈ 1.4 as ,β0 increases. The minimum of the critical Reynolds number experimentally obtained is about 400 at ,β0 ≈ 1.4.

关键词： Helical Circular Pipe torsion effect Critical Reynolds Number Turbulence

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