Numerical investigation of case hardening of plant tissue during dying and its influence on the cellular level shrinkage

Karunasena, H.C.P., Gu, Y.T., Brown, R.J., & Senadeera, W. (2014) Numerical investigation of case hardening of plant tissue during dying and its influence on the cellular level shrinkage. Drying Technology, 33(6), pp. 713-734.

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Abstract

Dried plant food materials are one of the major contributors to the global food industry. Widening the fundamental understanding on different mechanisms of food material alterations during drying assists the development of novel dried food products and processing techniques. In this regard, case hardening is an important phenomenon, commonly observed during the drying processes of plant food materials, which significantly influences the product quality and process performance. In this work, a recent meshfree-based numerical model of the authors is further improved and used to simulate the influence of case hardening on shrinkage characteristics of plant tissues during drying. In order to model fluid and wall mechanisms in each cell, Smoothed Particle Hydrodynamics (SPH) and the Discrete Element Method (DEM) are used. The model is fundamentally more capable of simulating large deformation of multiphase materials, when compared with conventional grid-based modelling techniques such as Finite Element Methods (FEM) or Finite Difference Methods (FDM). Case hardening is implemented by maintaining distinct moisture levels in the different cell layers of a given tissue. In order to compare and investigate different factors influencing tissue deformations under case hardening, four different plant tissue varieties (apple, potato, carrot and grape) are studied. The simulation results indicate that the inner cells of any given tissue undergo limited shrinkage and cell wall wrinkling compared to the case hardened outer cell layers of the tissues. When comparing unique deformation characteristics of the different tissues, irrespective of the normalised moisture content, the cell size, cell fluid turgor pressure and cell wall characteristics influence the tissue response to case hardening.

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ID Code: 82937
Item Type: Journal Article
Refereed: Yes
Additional Information: Published online 24 Nov 2014. The embargo on the accepted manuscript version will expire on 24 May 2016
Additional URLs:
Keywords: Food drying, Case hardening, Shrinkage, Plant tissue, Numerical modelling, Meshfree methods, SPH, DEM, Microscale models
DOI: 10.1080/07373937.2014.982759
ISSN: 0737-3937
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > FOOD SCIENCES (090800) > Food Engineering (090802)
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
Funding:
Copyright Owner: Copyright 2014 Taylor and Francis Inc.
Deposited On: 30 Mar 2015 05:45
Last Modified: 07 Jun 2016 05:19

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