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

TY - JOUR

T1 - Coalescence and agglomeration of individual particles of skim milk during convective drying

AU - Malafronte, L.

AU - Ahrné, L.

AU - Robertiello, V.

AU - Innings, F.

AU - Rasmuson, A.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Dairy

KW - Modelling

KW - Shell formation

KW - Single drop

KW - Spray drying

KW - Stickiness

U2 - 10.1016/j.jfoodeng.2015.11.021

DO - 10.1016/j.jfoodeng.2015.11.021

M3 - Journal article

AN - SCOPUS:84953345304

SN - 0260-8774

VL - 175

SP - 15

EP - 23

JO - Journal of Food Engineering

JF - Journal of Food Engineering

ER -