Abstract
Residence time distribution (RTD) of meat and carrot cubes in the holding tube of a commercial pilot scale aseptic processing system was evaluated using a full factorial design of experiments employing holding tube length (4·6, 9·2, 13·8 and 18·4 m), flow rate (10, 15 and 20 kg/min), particle size (10 and 20 mm meat cubes and 6 and 13 mm carrot cubes) and concentration of the carrier fluid (40 and 60 g/100 g starch) as factors. All test factors significantly ( P< 0·05) influenced the fastest particle residence time and its normalized counterpart, the mean particle residence time and standard deviation of RTD. Experimental RTD was well described by a generalized logistic model ( r 2> 0·95). The model parameters were responsive to test factors and could be well described using multiple regression analyses of test factors and their interactions.
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