Drag forces on rigid spherical particles suspended at specific points in a tube carrying viscous solutions of sodium carboxymethylcellulose (CMC) were measured using a load cell. Polystyrene spheres of diameter 1, 2.22 and 3.175 cm were used in a plexiglass tube of 4.75 cm internal diameter. the range of consistency coefficient of the carrier fluid studied was 5 to 16 Pa‐sn. Mass flow rate was varied between 0.01 and 0.9 kg/s. the drag coefficient‐generalized particle Reynolds number correlation developed from linear regression was: Cd = 101.35/[(NRe)p]0.84/n. This correlation may be used to estimate drag forces on suspended spherical food solids in aseptic holding tubes.
An obstacle in modeling aseptic processing of particulate foods is the lack of a reliable estimator for the drag force of the non‐Newtonian liquid phase on the suspended particles as they flow through the holding tubes of such systems. The objective was to develop an expression for the drag force on cubic assemblies of spherical particles suspended in a pseudoplastic fluid flowing in a tube.
An apparatus was assembled for direct measurement of the drag force exerted by solutions of sodium carboxymethyl cellulose (CMC) on the assemblies inside a tube. An empirical drag correction factor, as a function of particle volume fraction (applicable to Stokes' law), was developed.
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