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Author: search.filters.author.Chuwattanakul, V.Subject: search.filters.subject.Drying

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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.
    ;
    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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    Hydrodynamics investigation of pepper drying in a swirling fluidized bed dryer with multiple-group twisted tape swirl generators
    (2019-03-01)
    Chuwattanakul, V.
    ;
    Eiamsa-Ard, S.
    The present work aims to investigation the behavior of drying peppers in a swirling fluidized bed dryer (S-FBD) fitted with multiple twisted tape swirl generators. A multiple-group twisted tape swirl generator was located at the air inlet at the bottom of the bed. The effects of the superficial air velocity (U∗=U/U <inf>mf</inf> = 1.0, 1.1 and 1.2) on the moisture content (MC), moisture content ratio (MR) and drying rate (DR) were examined. The experimental results showed that the S-FBD can reduce the moisture content of peppers more rapidly than a conventional fluidized bed dryer (FBD). The S-FBD gave a higher DR and decreased drying time compared to that of a FBD. The results also indicated that operation at higher superficial air velocities resulted in a greater DR, especially at the beginning stage of the drying process. For the S-FBD, the reduced of MC, MR and DR at a high superficial air velocity (U∗=U/U <inf>mf</inf> = 1.2) was better than at low superficial air velocities (U∗= 1.0 and 1.1). Furthermore, five different drying models were evaluated to predict the performance of the S-FBD.