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Coalescence and agglomeration of individual particles of skim milk during convective drying

Loredana Malafronte (Institutionen för kemi och kemiteknik, Kemisk apparatteknik) ; Lilia Ahrné (Institutionen för biologi och bioteknik, Livsmedelsvetenskap) ; V. Robertiello ; F. Innings ; Anders Rasmuson (Institutionen för kemi och kemiteknik, Kemisk apparatteknik)
Journal of Food Engineering (0260-8774). Vol. 175 (2016), p. 15-23.
[Artikel, refereegranskad vetenskaplig]

This work presents a methodology, which combines experiments and modelling, for investigating the coalescence and agglomeration ability of a product and to support the modelling of product properties during spray drying. Two particles were dried simultaneously and contact tests were performed along the drying time. A validated mathematical model describing the drying kinetics of milk particles was used to predict surface conditions during contact tests. Three major mechanisms were observed, coalescence, stickiness, and non-stickiness, which were related to adhesion and cohesion forces. The simulation model allowed evaluation of the surface Ohnesorge dimensionless number and surface glass transition temperature, which showed to be good parameters for predicting contact mechanisms. The model was also used to predict shell formation in drying particles. Wet and dry shell formation was simulated over the drying time, to improve understanding of observed contact behaviour.

Nyckelord: Spray drying, Stickiness, Dairy, Shell formation, Modelling, Single drop



Denna post skapades 2016-02-24. Senast ändrad 2016-04-22.
CPL Pubid: 232390

 

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