Drying kinetics of droplets containing solids using reaction engineering approach

S.K. Pawar, J.T. Padding, N.G. Deen, A. Jongsma, F. Innings, J.A.M. Kuipers

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

Spray drying is an essential unit operation for production of powders from liquid slurry. Important events occurring inside the spray dryer are droplet formation, droplet drying and interactions between droplets and fine particles. The final goal of our project is to predict the dried solid particle size and mass flux distributions under conditions of collision, coalescence and agglomeration of droplets and particles. A coarse-grained simulation tool is developed which will enable the design more efficient spray dryers that can produce higher throughputs. One of the key ingredients of this simulation tool is the modelling of the drying characteristics of droplets containing solids. In this paper, a model is presented for drying of a droplet containing solids using a reaction engineering approach. The model is validated with experimental literature data for the drying of a single droplet of whole milk and skim milk, initially containing 20% solids. We compare the simulated droplet temperature, mass, drying rate and droplet diameter for different temperatures and solid content with experimental results. We compare correlations of Lin and Chen (2002) and Ranz and Marshall (1952) for the determination of the heat and mass transfer coefficients. Moreover, simulations of a single drying drop of whole milk, containing 30% solid, are compared with photographic results from the literature. We present preliminary simulation results of drying of many droplets in a section of a large scale spray dryer.
Originele taal-2Engels
TitelProceedings of the 19th International Drying Symposium (IDS), 24-27 August 2014, Lyon, France
Aantal pagina's8
StatusGepubliceerd - 2014
Evenement19th International Drying Symposium (IDS 2014), August
24-27 2014, Lyon, France
- Lyon, Frankrijk
Duur: 24 aug 201427 aug 2014
http://www.ispt.eu/events/19th-international-drying-symposium/

Congres

Congres19th International Drying Symposium (IDS 2014), August
24-27 2014, Lyon, France
Verkorte titelIDS 2014
Land/RegioFrankrijk
StadLyon
Periode24/08/1427/08/14
Internet adres

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