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Subject: search.filters.subject.Mathematical modelling

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    Item type:Publication,
    Mathematical modelling to control fungal growth in paddy dried using fluidisation
    (2021-04-01)
    Junka, Nittaya
    ;
    Rattanamechaiskul, Chaiwat
    Fungi can infect paddy from the planting process through to storage. Contaminating fungi can produce aflatoxins that can persist in the paddy and in storage until it is used to make other products. In the interests of food safety, in this study, we aimed to control the growth of fungi in paddy during storage using mathematical modelling of a drying method that uses fluidisation at temperatures of 70–150 °C. We found experimentally that an increase in the drying rate was related to an increase in the drying temperature. Drying paddy at a high temperature hardened the texture of rice when cooked, owing to the starch gelatinisation. Drying could decrease fungal growth (FG) and aflatoxin content during storage; however, it also resulted in a decrease in the antioxidant properties of paddy. Mathematical modelling and a proposed FG equation were applied to predict a suitable drying condition. The optimal drying condition reduced the risk of FG in stored paddy by ~50% without affecting antioxidant properties.
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    Item type:Publication,
    Drying guideline to control colour quality of para rubber sheet by computation method
    (2018-12-01)
    Junka, Nittaya
    ;
    Rattanamechaiskul, Chaiwat
    ;
    Prachayawarakorn, Somkiat
    ;
    Soponronnarit, Somchart
    Colour is one of the most important basic physical characteristics of dried para rubber sheets. This characteristic is used to determine the standards and trading prices. In this research, a mathematical model and a colour change equation were developed for para rubber sheet drying in a hot air oven, with the yellowness index (YI) as an indicator. The results show that the mathematical model provides validation of the moisture change and that the first-order rate reaction equation gives a satisfactory prediction of the colour change. The determination coefficient for every drying condition is between 0.9080–0.9742 and 0.9273–0.9813. Suitable drying conditions were used in the simulation using the model and equation, and the shortest drying time was applied in the study. Moreover, the colour value of the simulated para rubber sheet is not higher than that of the reference Unsmoked Sheet (USS) whose moisture is decreased by sun drying and is still in the best standard range.