Effect of System Variables on Heat Transfer to Canned Particulate Non-Newtonian Fluids During End-Over-End Rotation

Abstract

Apparent heat transfer coefficients h ap and U a were evaluated to quantify the heat transfer process with particulates in high viscosity non-Newtonian fluids in end-over-end thermal processing. An orthogonal array L16 experiment was used to examine the significances of system factors on h ap and U a values with plastic particles in CMC aqueous solutions. The variance analysis showed that rotation speed, liquid viscosity, retort temperature, particle material and particle concentration were significant factors ( P < 0.05) for h ap and U a. The effects of can size was also significant for h ap. A central composite rotatable design (CCRD) experiment and two full factorial experiments were carried out to study the effects of those significant factors on h ap and U a values. Results showed that with the decrease of liquid viscosity and the increase of rotation speed, particle density and retort temperature, h ap and U a values increased. With the increase of can size h ap values decreased. With the particle concentration increasing h ap and U a values firstly increased and then decreased with further increase in particle concentration.