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

Apparent heat transfer coefficients hap and Ua 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 hap and Ua 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 hap and Ua. The effects of can size was also significant for hap. A central composite rotatable design (CCRD) experiment and two full factorial experiments were carried out to study the effects of those significant factors on hap and Ua values. Results showed that with the decrease of liquid viscosity and the increase of rotation speed, particle density and retort temperature, hap and Ua values increased. With the increase of can size hap values decreased. With the particle concentration increasing hap and Ua values firstly increased and then decreased with further increase in particle concentration.