Drying and cracking mechanisms in a starch slurry

Goehring, L. ORCID: 0000-0002-3858-7295, 2009. Drying and cracking mechanisms in a starch slurry. Physical Review E, 80 (3), 036116. ISSN 1539-3755

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Starch-water slurries are commonly used to study fracture dynamics. Drying starch cakes benefit from being simple, economical, and reproducible systems, and have been used to model desiccation fracture in soils, thin-film fracture in paint, and columnar joints in lava. In this paper, the physical properties of starch-water mixtures are studied, and used to interpret and develop a multiphase transport model of drying. Starch cakes are observed to have a nonlinear elastic modulus, and a desiccation strain that is comparable to that generated by their maximum achievable capillary pressure. It is shown that a large material porosity is divided between pore spaces between starch grains, and pores within starch grains. This division of pore space leads to two distinct drying regimes, controlled by liquid and vapor transport of water, respectively. The relatively unique ability for drying starch to generate columnar fracture patterns is shown to be linked to the unusually strong separation of these two transport mechanisms.

Item Type: Journal article
Publication Title: Physical Review E
Creators: Goehring, L.
Publisher: American Physical Society
Date: 21 September 2009
Volume: 80
Number: 3
ISSN: 1539-3755
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 05 Sep 2016 10:17
Last Modified: 09 Jun 2017 14:05
URI: http://irep.ntu.ac.uk/id/eprint/28377

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