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Capillary wetting of heterogeneous powders

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Capillary wetting of heterogeneous powders (Volume 15)

Jana Kammerhofer (Author)

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ISBN-13 (Hard Copy) 9783736970823
ISBN-13 (eBook) 9783736960824
Language English
Page Number 156
Lamination of Cover matt
Edition 1.
Book Series SPE-Schriftenreihe
Volume 15
Publication Place Göttingen
Publication Date 2019-09-09
General Categorization Dissertation
Departments Mechanical and process engineering
Keywords Capillary penetration, Wetting, Dissolution, Heterogeneity, Viscosity build up, Contact angle, Food powder, Reconstitution, Hydrophilic, Hydrophobic, Crystalline sucrose, Washburn setup, Washburn equation, Pore network, Model
Description

The objective of this PhD thesis is the enhancement of understanding and prediction of capillary wetting of heterogeneous, soluble food powders. Therefore, the capillary penetration is studied experimentally by increasing stepwise the complexity. Firstly, the heterogeneity in terms of contact angle and the effect of solubility during capillary wetting as the two main influencing factors are investigated separately and in a second step both factors are combined. Furthermore, a new model based on the coupling of the Washburn and the mass transfer equation is presented dealing simultaneously with capillary penetration and dissolution. It is observed that the viscosity increase is dominant during liquid penetration for the powder systems containing the most soluble component (sucrose) at a high concentration. For powder mixtures containing a less soluble component with less viscosity development (sodium chloride), the hydrophobic contact angle drives the liquid penetration.