Abstract
The residence time distribution (RTD) of meat and carrot cubes was evaluated in the vertical scraped surface heat exchanger of a pilot scale aseptic processing system using a full factorial design of experiments employing flow rate (10, 15, 20 and 25 kg/min), particle size (meat cubes of size 10, 15 and 20 mm; and carrot cubes of size 6 and 13 mm) and concentration of the carrier fluid (4, 5 and 6% w w starch) as factors. All factors influenced ( P < 0.05) the fastest particle residence time (FPRT), the mean particle residence time (MPRT), standard deviation of the residence time distribution (SRTD) and their normalized versions. A generalized logistic model showed a reasonable fit for the experimental RTD under all test conditions ( r 2 > 0.95). Analysis of variance revealed that all test factors were responsive ( P < 0.05) to parameters associated with the model: the half concentration internal age ( HRT & HNT), the particle accumulation rate ( B) and the upper limit particle concentration ( U).
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