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Flow of Non-Newtonian Fluids in an Annulus with Rotation of the Inner Cylinder  

김영주 (성균관대학교 기계공학과)
우남섭 (성균관대학교 기계공학과)
황영규 (성균관대학교 기계공학과)
Publication Information
Tunnel and Underground Space / v.12, no.4, 2002 , pp. 277-283 More about this Journal
Abstract
This experimental study concerns the characteristics of a helical flow in a concentric annulus with a diameter ratio of 0.52, whose outer cylinder is stationary and inner one is rotating. The pressure losses and skin friction coefficients have been measured for the fully developed flow of Non-Newtonian fluid, aqueous solution of sodium carbomethyl cellulose (CMC) and bentonite with inner cylinder rotational speed of 0~400 prm. Also, the visualization of helical flows has been performed to observe the unstable waves. The results of present study reveal the relation of the Reynolds number Re and Rossby number Ro with respect to the skin friction coefficients. In somehow, they show the existence of flow instability mechanism. The pressure losses increase as the rotational speed increases, but the gradient of pressure losses decreases as the Reynolds number increases in the regime of transition and turbulence. And the increase of flow disturbance by Taylor vortex in a concentric annulus with rotating inner cylinder results in the decrease of the critical Reynolds number with the increase of skin friction coefficient.
Keywords
Concentric-Annulus Flow; Slim-Hole Drilling; Non-Newtonian Fluid;
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