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CCE
2007

A dimensionless study of the evaporation and drying stages in spray pyrolysis

13 years 11 months ago
A dimensionless study of the evaporation and drying stages in spray pyrolysis
An original dimensionless study of the pure evaporation and precipitation stages of a spray pyrolysis process has been performed. An estimation of the evaporation time is proposed and the influence of the main processing parameters has been investigated. For operating conditions corresponding to industrial requirements, the main limiting step of the evaporation stage is thermal transfer from the column walls to the gas, not mass or thermal transfer at the droplet surface. Therefore, gas and liquid temperatures remain equal and constitutive equations can be greatly simplified. Moreover, in these conditions, neither solute concentration nor temperature gradients exist inside micronic droplets. Some data from the literature have been modelled and show the large range of validity of the equations and explanations proposed. Finally, with the assumptions made here, the dimensionless study of the precipitation stage shows that the presence of a crust can increase the drying time four-fold....
N. Reuge, B. Caussat
Added 12 Dec 2010
Updated 12 Dec 2010
Type Journal
Year 2007
Where CCE
Authors N. Reuge, B. Caussat
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