A particle based model to simulate microscale morphological changes of plant tissues during drying

Karunasena, H.C.P., Senadeera, Wijitha, Brown, Richard J., & Gu, YuanTong (2014) A particle based model to simulate microscale morphological changes of plant tissues during drying. Soft Matter, 10(29), pp. 5249-5268.

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Fundamental understanding on microscopic physical changes of plant materials is vital to optimize product quality and processing techniques, particularly in food engineering. Although grid-based numerical modelling can assist in this regard, it becomes quite challenging to overcome the inherited complexities of these biological materials especially when such materials undergo critical processing conditions such as drying, where the cellular structure undergoes extreme deformations. In this context, a meshfree particle based model was developed which is fundamentally capable of handling extreme deformations of plant tissues during drying. The model is built by coupling a particle based meshfree technique: Smoothed Particle Hydrodynamics (SPH) and a Discrete Element Method (DEM). Plant cells were initiated as hexagons and aggregated to form a tissue which also accounts for the characteristics of the middle lamella. In each cell, SPH was used to model cell protoplasm and DEM was used to model the cell wall. Drying was incorporated by varying the moisture content, the turgor pressure, and cell wall contraction effects. Compared to the state of the art grid-based microscale plant tissue drying models, the proposed model can be used to simulate tissues under excessive moisture content reductions incorporating cell wall wrinkling. Also, compared to the state of the art SPH-DEM tissue models, the proposed model better replicates real tissues and the cell-cell interactions used ensure efficient computations. Model predictions showed good agreement both qualitatively and quantitatively with experimental findings on dried plant tissues. The proposed modelling approach is fundamentally flexible to study different cellular structures for their microscale morphological changes at dehydration.

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4 citations in Scopus
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5 citations in Web of Science®

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ID Code: 73377
Item Type: Journal Article
Refereed: Yes
Keywords: Smoothed Particle Hydrodynamics, SPH, cells and tissue, Meshfree Methods, Drying, DEM, Numerical Modeling
DOI: 10.1039/C4SM00526K
ISSN: 1744-6848
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 The Royal Society of Chemistry
Deposited On: 06 Jul 2014 23:08
Last Modified: 30 Aug 2015 23:58

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