STUDIES ON DOWNWARD SWIRLING FLOW IN VERTICAL PIPES

Abstract

Studies on the downward swirling flow in vertical tub .s with tangential liquid entries have been conducted. In swirling flow, the pressure drop across the entry head and the tube through which the liquid is flowing, is the summation of the friction loss due to sudden expansion of cross section of the pipe, the radial pressure drop at the entry head, the pressure drop due to the swirling flow inside the tube and the . pressure drop dUe to friction in the entry pipes. The various parameters involved are not easily amenable for measurement and in view of this difficulty, using dimensional analysis, following correlation has been proposed to predict the pressure drop. -.0 .0 3 -0.85 (Eu)=2 .05x103 e)•(Fr)0601 (Di/Dt) (L/Dt) The computed values of the pressure drop from theoretical considerations have been found to Tie within + 3)% deviation of the experimental values while the values of pressure drop computed from correlation lie within 15% of the experimental values.