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 525768
Title Vacuolenvorming bij het verstuivingsdrogen
Author(s) Verhey, J.G.P.
Source University. Promotor(en): E.A. Vos. - Wageningen : Pudoc - ISBN 9789022004500
Publication type Dissertation, internally prepared
Publication year 1973
Keyword(s) melkpoeder - sproeidroging - vloeistofmechanica - gassen - vloeistoffen (liquids) - vloeistoffen (fluids) - mengsels - stroming - dried milk - spray drying - fluid mechanics - gases - liquids - fluids - mixtures - flow
Categories Thermodynamics
Abstract

Experiments with a pilot spray drier showed that vacuoles in spray-powder particles originate from air bubbles. These are dispersed in the liquid during spraying, before actual atomization. During drying, the air bubbles expand as a result of gradual solidification of the droplet surface ('case hardening') before drying is complete. The vacuole volume is governed by the degree of air incorporation (related to type and design of atomizer and properties of the feed liquid) and the bubble expansion (related, for instance, to inlet air temperature).

Vacuoles do not develop as a result of spontaneous boiling phenomena. Vacuole-free powders can be produced by replacing the air in the atomizer by steam.

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