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Start date: 2023Subject: search.filters.subject.Fluidized bed

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    Performance comparison between gradient orifice and uniform orifice distributors in rotating fluidization for coated jasmine rice
    (2026-04-01)
    Prakotmak, Preeda
    ;
    Phothong, Watchama
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    Rattanamechaiskul, Chaiwat
    ;
    Junka, Nittaya
    A rotating fluidized bed coater offers an alternative technology in which particles are fluidized by balancing centrifugal, buoyant, and gravitational forces, thereby improving coating homogeneity and mass transfer. The coating performance between the gradient orifice distributor (GOD) and the uniform orifice distributor (UOD) was compared at rotational speeds of 20, 70, or 120 rpm. The experiment was set up to coat a turmeric-extract solution onto the surface of jasmine rice. The coating substance was sprayed from the nozzle at 35 or 40 mL/min at an air-atomization pressure of 1.5 bar for 6 or 8 min. Hot air (55 or 60 °C) flows were passed at an inlet velocity of 2.9 m/s, with 85 % by volume of the air recycled. The quality of the sample was evaluated based on its final moisture content, percentage of fissure kernels, head-coated rice yield, color, coating efficiency, total phenolic content, and antioxidant activity. Based on the results, GOD was a suitable distributor plate for producing turmeric-extract-coated rice. For optimal coating conditions, the jasmine rice should be coated at a drying temperature of 55 °C, using a coating solution spray rate of 35 mL/min, a rotational speed of 70 rpm, a spraying coating time of 6 min, and a drying time of 10 s after the spraying stage. Using these conditions, the coating efficiency was 84.2 % and the antioxidant activity of the coated rice was 30.53 % higher than that of the referent white rice.
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    Influence of bed height and drying temperature on shrimp drying characteristics using a fluidized-bed dryer
    (2023-08-01)
    Nanan, K.
    ;
    Eiamsa-ard, S.
    ;
    Chokphoemphun, S.
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    Kumar, Manoj
    ;
    Pimsarn, M.
    The aim of this work was to study shrimp drying in a fluidized-bed dryer to develop a process that performs better than traditional (sun dried) shrimp production. In these experiments, the influence of shrimp size (small, medium and large), bed height (h/D = 0.33, 0.66 and 1.0) and air temperature (60, 70 and 80 °C) on the drying rate were studied under a constant blower power. The experimental results showed that the moisture content of boiled shrimp decreased with an increased drying temperature due to the consequently higher temperature differential between the hot air and the shrimp. When the bed height (h/D) was reduced, shrimp moisture removal increased, but it also increased when shrimp size decreased. Moreover, the production rate of dried shrimp under a bed height h/D = 1.0 and drying temperature of 80 °C yielded the highest dried shrimp production rate of 4.83, 4.21 and 3.72 kg/h for small, medium and large shrimps, respectively.
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