Power Laws in the Elasticity and Yielding of Plant Particle Suspensions

Lopez-Sanchez, Patricia and Farr, Robert (2012) Power Laws in the Elasticity and Yielding of Plant Particle Suspensions. Food Biophysics, 7 1: 15-27. doi:10.1007/s11483-011-9238-8

Author Lopez-Sanchez, Patricia
Farr, Robert
Title Power Laws in the Elasticity and Yielding of Plant Particle Suspensions
Journal name Food Biophysics   Check publisher's open access policy
ISSN 1557-1858
Publication date 2012-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.1007/s11483-011-9238-8
Open Access Status Not yet assessed
Volume 7
Issue 1
Start page 15
End page 27
Total pages 13
Place of publication New York, NY United States
Publisher Springer New York LLC
Language eng
Subject 1106 Human Movement and Sports Science
1304 Biophysics
1602 Criminology
2402 Applied Microbiology and Biotechnology
1502 Banking, Finance and Investment
Abstract The yielding and flow behaviour of plant suspensions are perhaps the most important rheological properties in process and product design for applications in paper, biofuel and food industries. Studies are reported here on the yield properties and flow behaviour of suspensions of plant particles with different shapes (clusters of cells, individual cells and cell fragments). Carrot and tomato were selected as model plant systems to prepare suspensions at particle dry mass concentrations ranging from 0. 010 to 0. 065. The flow behaviour was characterised by an apparent yield stress and shear thinning. The Herschel-Bulkley yield stress obtained from up and return flow curves was compared to the yield stress calculated from oscillatory measurements. The dependence of the yield stress values on particle dry mass concentration is approximately a power-law, with a fitted exponent of 3 ± 0. 5 for all the suspensions, independently of the plant origin and particle shape. This same power-law behaviour was found for the elastic modulus G′, and in this case the exponent was 3 for carrot and 4 for the tomato suspensions. The yield strain, calculated from oscillatory measurements, decreased slightly with dry mass fraction, but did not follow a power-law. We discuss possible explanations for power law behaviour, and provide a model for G′ based on folded elastic sheets, which predicts an exponent of 3, similar to the values obtained for these suspensions.
Keyword Carrot
Elastic modulus
Power law
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Nutrition and Food Sciences Publications
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Created: Fri, 15 Aug 2014, 23:07:27 EST by Patricia Lopez-sanchez on behalf of Centre for Nutrition and Food Sciences