Abstract
ABSTRACTResidence times of multiple particles in aqueous solutions of carboxy‐methylcellulose (CMC) in a holding tube arrangement were measured at different conditions of fluid viscosity, suspension flow rate, particle sizes and particle concentrations. Nearly neutrally buoyant polystyrene spheres were used to simulate food particles. Residence time distribution functions, E(t), applicable to lethality calculations in aseptic processing were developed along with equations to predict the mean (RTmean), minimum (RTmin) and standard deviation (RT std) of the residence times as a function of process parameters. Results showed that viscosity, flow rate and particle concentrationhad significant (a = 0.05) effects on RTmean) RT min and RT std while particle size affected only RT std. The ratio of mean residence time to minimum residence time was 1.06 to 1.16.
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