Abstract
A finite difference program was used to simulate an aseptic processing of foods containing particulates. The accumulated lethality at the center of the particle moving through the heat/hold/cool sections of the continuous sterilization system and the minimum processing time to destroy 6 D of Clostridium sp. PA3679 and 12 D of peroxidase necessary to prevent regeneration were calculated. Effect of operating conditions and change of thermal properties of particle and fluid on accumulated lethality and required minimum processing time is presented. Results indicated that size, shape, thermal properties, and residence time distributions of the particle within scraped-surface heat exchanger (SSHE) and holding tube greatly influenced the accumulated lethality and, subsequently, the minimum required processing time. In addition, effects of the overall heat transfer coefficient for both heater and holding tube and the particle surface heat transfer coefficient were found to be significant.
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