Optimization of co-current spray drying process of sugar-rich foods. Part I - Moisture and glass transition temperature profile during drying


Autoria(s): Truong, Vinh; Bhandari, Bhesh R.; Howes, Tony
Data(s)

01/11/2005

Resumo

A steady state mathematical model for co-current spray drying was developed for sugar-rich foods with the application of the glass transition temperature concept. Maltodextrin-sucrose solution was used as a sugar-rich food model. The model included mass, heat and momentum balances for a single droplet drying as well as temperature and humidity profile of the drying medium. A log-normal volume distribution of the droplets was generated at the exit of the rotary atomizer. This generation created a certain number of bins to form a system of non-linear first-order differential equations as a function of the axial distance of the drying chamber. The model was used to calculate the changes of droplet diameter, density, temperature, moisture content and velocity in association with the change of air properties along the axial distance. The difference between the outlet air temperature and the glass transition temperature of the final products (AT) was considered as an indicator of stickiness of the particles in spray drying process. The calculated and experimental AT values were close, indicating successful validation of the model. (c) 2004 Elsevier Ltd. All rights reserved.

Identificador

http://espace.library.uq.edu.au/view/UQ:75767

Idioma(s)

eng

Publicador

Elsevier Sci Ltd

Palavras-Chave #Glass Transition Temperature #Mathematical Modeling #Optimization #Maltodextrin #Sucrose #Spray Drying #Stickiness #Sugar-rich Foods #Engineering, Chemical #Food Science & Technology #Humidity Profiles #Air-temperature #Cell Model #Dryers #C1 #290102 Food Engineering #670104 Fruit and vegetable products (incl. fruit juices) #670105 Dairy products #259903 Industrial Chemistry #620106 Sugar
Tipo

Journal Article