Residence time distribution of the drum dryer

Wan Ramli Wan Daud, W. D. Armstrong

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The residence time distribution of the drum dryer is investigated for the first time using a simple technique of analysing the output responses to instantaneous and step inputs of a tracer on the assumption that no dispersion occurs. The "vessel" of the drum dryer is defined to include the cylinder of gel (sausage) which is normally formed at the point where the drum and the roller are closest, and the narrow space between them (nip). Sodium chloride is the inert tracer used. The age distribution curves of the tracer corresponding to instantaneous inputs fit very well the Cholette and Cloutier model which consists of a parallel combination of a bypass and an ideal stirred tank with a dead volume connected to the latter. The response curves corresponding to the step inputs deviate slightly from the model due to slight oscillations of the tracer pump. The extent of fluid mixing and stagnation increases with the size of the sausage and the nip.

Original languageEnglish
Pages (from-to)2399-2405
Number of pages7
JournalChemical Engineering Science
Volume43
Issue number9
DOIs
Publication statusPublished - 1988

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Residence time distribution
Sodium chloride
Sodium Chloride
Gels
Pumps
Fluids

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Residence time distribution of the drum dryer. / Wan Daud, Wan Ramli; Armstrong, W. D.

In: Chemical Engineering Science, Vol. 43, No. 9, 1988, p. 2399-2405.

Research output: Contribution to journalArticle

Wan Daud, Wan Ramli ; Armstrong, W. D. / Residence time distribution of the drum dryer. In: Chemical Engineering Science. 1988 ; Vol. 43, No. 9. pp. 2399-2405.
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