Modeling heat transfer for disinfestation and control of insects (larvae and eggs) in date fruits

Modeling heat transfer for disinfestation and control of insects (larvae and eggs) in date fruits

A space-and-time dependent model describing the impact of heat transfer on insect survival rate was developed for analyzing the heat disinfestation process of dates. A 2D axial-symmetric domain was defined with five sub-domains: the bulk date pulp, a thin air layer and the date pit, a larva (located in the air layer) and eggs (on the date surface). The model included convective heating and microwave heating (915 MHz). Dielectric properties of the date pulp, egg and larvae were measured. The model predictions showed good agreement with experimental results in the case of the ''biological model'' (Ephestia kuehniella Zeller) in dates subjected to hot air treatment (70 _C). Sensitive analysis showed that the date size and water content greatly affected the heating time process, during hot air and microwave treatments. Moreover, regarding the eggs' specific surface, it is advisable to combine convective hot air with microwave heating to induce egg mortality on the date surface.

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Bibliographic Details
Main Authors: Ben-Lalli, Ameziane, Bohuon, Philippe, Collignan, Antoine, Méot, Jean-Michel
Format: article biblioteca
Language:eng
Subjects:J11 - Manutention, transport, stockage et conservation des produits d'origine végétale, Q02 - Traitement et conservation des produits alimentaires, H10 - Ravageurs des plantes, datte, lutte antiparasite en entreposage, lutte anti-insecte, traitement thermique, échange thermique, propriété diélectrique, micro-ondes, modèle mathématique, http://aims.fao.org/aos/agrovoc/c_25475, http://aims.fao.org/aos/agrovoc/c_7432, http://aims.fao.org/aos/agrovoc/c_3885, http://aims.fao.org/aos/agrovoc/c_24947, http://aims.fao.org/aos/agrovoc/c_3521, http://aims.fao.org/aos/agrovoc/c_2260, http://aims.fao.org/aos/agrovoc/c_4815, http://aims.fao.org/aos/agrovoc/c_24199, http://aims.fao.org/aos/agrovoc/c_3081, http://aims.fao.org/aos/agrovoc/c_259,
Online Access:http://agritrop.cirad.fr/567684/
http://agritrop.cirad.fr/567684/1/document_567684.pdf
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Summary:A space-and-time dependent model describing the impact of heat transfer on insect survival rate was developed for analyzing the heat disinfestation process of dates. A 2D axial-symmetric domain was defined with five sub-domains: the bulk date pulp, a thin air layer and the date pit, a larva (located in the air layer) and eggs (on the date surface). The model included convective heating and microwave heating (915 MHz). Dielectric properties of the date pulp, egg and larvae were measured. The model predictions showed good agreement with experimental results in the case of the ''biological model'' (Ephestia kuehniella Zeller) in dates subjected to hot air treatment (70 _C). Sensitive analysis showed that the date size and water content greatly affected the heating time process, during hot air and microwave treatments. Moreover, regarding the eggs' specific surface, it is advisable to combine convective hot air with microwave heating to induce egg mortality on the date surface.

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