Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525622
Title Continuous mixing of solids
Author(s) Raouf, M.S.
Source University. Promotor(en): H.A. Leniger; N.H. Kuiper. - Wageningen : Veenman - 73
Publication type Dissertation, internally prepared
Publication year 1963
Keyword(s) mengers - vermenging - transportvoertuigen - materialen - voorbehandeling - metaalbewerking - mixers - mixing - transporters - materials - pretreatment - metal working
Categories Physical Chemistry
Abstract The most important literature on theoretical aspects of mixing solids was reviewed.

Only when the mixed materials showed no segregation it was possible to analyse the mixing process quantitatively. In this case the mixture could be described by the 'χ' Square test. Longitudinal mixing could be studied by estimating the spread in residence times.

In two common types of mixers the mixing was studied of two kinds of granular materials, differing only in colour of granules. (Colour had no influence on mixing.)

In a continuously operating semi-technical 'Spaans' screw and ribbon mixer the mixing proceeded rapidly but irregularly. The minimal mixer length necessary for apparent completion of mixing decreased at higher speeds of rotation. The performance of a more widely pitched. screw and ribbon element was slightly better. The spread in residence times was appreciable. Longitudinal mixing was slightly more intensive at higher speeds of rotation, wider screw and ribbon pitches and greater mixer lengths.

In a mixer consisting of a simple, rotating, slightly inclined, partially filled, hollow cylinder mixing proceeded more gradually. Mixing was 'diffusive'. The mixing rate increased with increased rotational speed, increased wall roughness and decreasing feed rate. Longitudinal mixing proved to be very limited.

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