Mathematical modelling and numerical simulation of phosphine flow during grain fumigation in leaky cylindrical silos

Mat Isa, Zaiton, Farrell, Troy W., Fulford, Glenn, & Kelson, Neil A. (2016) Mathematical modelling and numerical simulation of phosphine flow during grain fumigation in leaky cylindrical silos. Journal of Stored Products Research, 67, pp. 28-40.

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The phosphine distribution in a cylindrical silo containing grain is predicted. A three-dimensional mathematical model, which accounts for multicomponent gas phase transport and the sorption of phosphine into the grain kernel is developed. In addition, a simple model is presented to describe the death of insects within the grain as a function of their exposure to phosphine gas. The proposed model is solved using the commercially available computational fluid dynamics (CFD) software, FLUENT, together with our own C code to customize the solver in order to incorporate the models for sorption and insect extinction. Two types of fumigation delivery are studied, namely, fan- forced from the base of the silo and tablet from the top of the silo. An analysis of the predicted phosphine distribution shows that during fan forced fumigation, the position of the leaky area is very important to the development of the gas flow field and the phosphine distribution in the silo. If the leak is in the lower section of the silo, insects that exist near the top of the silo may not be eradicated. However, the position of a leak does not affect phosphine distribution during tablet fumigation. For such fumigation in a typical silo configuration, phosphine concentrations remain low near the base of the silo. Furthermore, we find that half-life pressure test readings are not an indicator of phosphine distribution during tablet fumigation.

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1 citations in Web of Science®
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ID Code: 93422
Item Type: Journal Article
Refereed: Yes
Keywords: Mathematical modelling, Fumigation, Grain storage, Phosphine, Computational fluid dynamics
DOI: 10.1016/j.jspr.2016.01.002
ISSN: 0022-474X
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > APPLIED MATHEMATICS (010200) > Applied Mathematics not elsewhere classified (010299)
Australian and New Zealand Standard Research Classification > AGRICULTURAL AND VETERINARY SCIENCES (070000) > CROP AND PASTURE PRODUCTION (070300) > Crop and Pasture Post Harvest Technologies (incl. Transportation and Storage) (070307)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Computational Fluid Dynamics (091501)
Divisions: Current > QUT Faculties and Divisions > Division of Technology, Information and Library Services
Current > Research Centres > High Performance Computing and Research Support
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Elsevier
Copyright Statement: Licensed under the Creative Commons Attribution; Non-Commercial; No-Derivatives 4.0 International. DOI: 10.1016/j.jspr.2016.01.002
Deposited On: 06 Mar 2016 23:34
Last Modified: 15 Mar 2016 04:42

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