Experimental characterization and modelling of multiphase systems during the freezing process at the pilot scale : Application to sorbet manufacturing in scraped surface heat exchangers

Abstract : The partial freezing of the mix inside the scraped surface heat exchanger (SSHE) is the most critical step in sorbet manufacturing, since it is the only stage where new ice crystals are produced; further in the process these ice crystals will only grow. The main objective of the freezing process is to form the smallest possible ice crystals, so as to assure a smooth texture in the final product. During the freezing process the product is subjected to coupled interactions of fluid flow, heat transfer, ice phase change and shear. These interactions are determined by the freezing operating conditions and affect the evolution of the ice crystals size distribution (CSD) and the final texture of the product. This work presents the experimental characterization and the modelling of the initial freezing process of a sorbet. The freezing of sorbet was carried out in a SSHE at the pilot scale. The main objective of this work was the study of the influence of the freezing operating conditions on the final product characteristics: ice CSD, product temperature, ice volume fraction, apparent viscosity. The product flow behaviour in the SSHE was characterized by an experimental and modelling study of the residence time distribution (RTD) of the product. An ice crystallization modelling approach, taking into account the coupling of an empirical RTD model with heat transfer equations and a population balance of the different ice crystal size classes was developed. With a first set of estimated parameters, the ice crystallization model predicts satisfactorily the experimental trends, and made it possible to have an insight on the evolution of ice CSD during the freezing process in the SSHE.
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Marcela Patricia Arellano Salazar. Experimental characterization and modelling of multiphase systems during the freezing process at the pilot scale : Application to sorbet manufacturing in scraped surface heat exchangers. Food engineering. AgroParisTech, 2012. English. ⟨NNT : 2012AGPT0088⟩. ⟨pastel-01059043⟩

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