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Access type: UnknownSubject: search.filters.subject.fluidized bed drying

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    Influence of hot air fluidized bed drying on quality changes of purple rice
    (2016-09-09)
    Rattanamechaiskul, Chaiwat
    ;
    Junka, Nittaya
    ;
    Wongs-Aree, Chalermchai
    ;
    Prachayawarakorn, Somkiat
    ;
    Soponronnarit, Somchart
    The influence of drying using a fluidization technique on the quality of purple rice was investigated in this study. The results demonstrated that the initial moisture of rice was 28.3% dry basis (db). Compared to the sun-dried or reference purple rice samples, the influence of drying at temperatures ranging from 100 to 150°C did not affect the quality of color, anthocyanin content, total phenolic content, or antioxidant activity. At this initial moisture level, samples should be dried at 150°C air because such temperatures yield the highest drying rate. Drying at this temperature also causes an increase in the head purple rice yield because of the gelatinization of starch. In the case of an initial moisture content of 33.3% (db), the drying temperature should not exceed 130°C.
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    Modeling heat and mass transfer–induced stresses in germinated brown rice kernels during fluidized bed drying
    (2016-04-25)
    Srisang, Naruebodee
    ;
    Soponronnarit, Somchart
    ;
    Thuwapanichayanan, Ratiya
    ;
    Prachayawarakorn, Somkiat
    ABSTRACT: A study of stress distribution inside a germinated brown rice (GBR) kernel during drying is important to understand the fissure formation of GBR and hence control the drying process in order to improve the quality of GBR. In this study, a finite element method performed in three dimensions in conjunction with the heat and mass balance of the drying system was developed to describe moisture, temperature, and stress distributions inside GBR kernels during fluidized bed drying. The modeling was carried out using the coupling of heat and mass transfer and validated with experimental data at 90–150°C. The results of moisture and temperature predictions agreed well with the experiments. During drying, tensile stress occurred at the layers close to surface and compressive stress occurred at the inner portion of a kernel. The tensile and compressive stresses increased to the highest value at about 30 s of drying, corresponding to the highest moisture gradient, and then decreased afterwards. The tensile and compressive stresses were higher at a higher drying temperature. These stress prediction results corresponded to the experiments, which show more severe GBR fissuring at higher drying temperatures.