(217g) Terminal Velocity and Drag Curve of Non Spherical Particles in Liquids | AIChE

(217g) Terminal Velocity and Drag Curve of Non Spherical Particles in Liquids

Authors 

Susarla, S. - Presenter, STANLEY COLLEGE OF ENGINEERING AND TECHNOLOGY FOR WOMEN


Importance of settling velocities and drag curve of spherical and non ? spherical particles in liquids is well recognized. Several correlations for drag coefficient both for spherical and non ? spherical particles in Newtonian liquids are available in literature. Data correlations for power law fluids are often on similar lines as of Newtonian liquids. In this paper a wide range of experimental data are being generated to evaluate the existing correlations for drag coefficient that include particle shape effect, wall effect and the power law parameters. The range of data covers water, glycerol, glycerol solutions, caster oil, glucose solutions, honey (Newtonian liquids) and CMC solutions of six concentrations in water (non - Newtonian - power law). The particle shapes are cubes, cones, ellipsoids, cylinders of various cross sections circular, square, hexagonal and triangular, the material used would include Aluminum, brass, copper, steel, glass, acrylic, Teflon and Perspex. The glass column diameters range from 10mm ? 100mm. Visual characteristics of the particles are being photographed for any rotation or swinging. The literature correlations are often between drag coefficient and Reynolds number (modified for non ? Newtonian liquids) with sphericity as a parameter. The characteristics of settling and drag coefficient would be discussed using correlations for specific shapes (spherical, disc, cylinder) and unified correlations of drag.

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