Flow characteristics of a pilot-scale high temperature, short time pasteurizer

Journal of Dairy Science
P M Tomasula, M F Kozempel

Abstract

In this study, we present a method for determining the fastest moving particle (FMP) and residence time distribution (RTD) in a pilot-scale high temperature, short time (HTST) pasteurizer to ensure that laboratory or pilot-scale HTST apparatus meets the Pasteurized Milk Ordinance standards for pasteurization of milk and can be used for obtaining thermal inactivation data. The overall dimensions of the plate in the pasteurizer were 75 x 115 mm, with a thickness of 0.5 mm and effective diameter of 3.0 mm. The pasteurizer was equipped with nominal 21.5- and 52.2-s hold tubes, and flow capacity was variable from 0 to 20 L/h. Tracer studies were used to determine FMP times and RTD data to establish flow characteristics. Using brine milk as tracer, the FMP time for the short holding section was 18.6 s and for the long holding section was 36 s at 72 degrees C, compared with the nominal times of 21.5 and 52.2 s, respectively. The RTD study indicates that the short hold section was 45% back mixed and 55% plug flow for whole milk at 72 degrees C. The long hold section was 91% plug and 9% back mixed for whole milk at 72 degrees C. This study demonstrates that continuous laboratory and pilot-scale pasteurizers may be used to study inactiva...Continue Reading

References

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Jul 21, 2004·Journal of Dairy Science·P M Tomasula, R P Konstance

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Citations

Apr 12, 2016·Journal of Dairy Science·Michael H TunickPeggy M Tomasula
Feb 24, 2015·Journal of Dairy Science·Phoebe X QiPeggy M Tomasula
Mar 8, 2011·Journal of Food Protection·C O GillW J Meadus

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