ABSTRACTResidence time distribution (RTD) affected lethal effects of heat on 1.27 cm diameter particles in the holding section of an aseptic processing system. The variations in particle center and particle surface F0were determined as a function of particle density, flow rate, and particle to fluid heat transfer coefficient, hfp. Particles with density ratios of 1.00‐1.04 relative to the carrier fluid showed diverse RTD characteristics in the hold tube. Particles with density ratio of 1.01 had the least residence time. The distribution of the particle center F0value increased with increase in the hf
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