Abstract
Convective transport of micro-organisms and staling effects are not normally considered during the design of a tunnel pasteurization plant. However, if increasing demands on product quality are to be met, those effects have to be taken into account. This paper describes a model for the unsteady convective heat transfer inside a bottle, taking into account the influence of the convective flow on pasteurization and staling effects. Simulation results indicate that the model gives a good representation of experimental results, both of laboratory and process data. Simulation studies show that the traditional procedure for determining pasteurization units ( PU ) can overestimate the actual effect considerably if the reference point is not chosen accurately with reference to the bottle size and shape. Furthermore, it is suggested that a unit definition for the pasteurization induced staling effect should be developed comparable to the PU definition.
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