Modeling kinetics of convective drying of Curcuma longa L.
ABSTRACT This study aimed to determine drying curves of land saffron (Curcuma longa L.) rhizomes at different temperatures and ventilation conditions to adjust non-linear regression models, and to calculate effective diffusion coefficients and activation energies. Saffron rhizomes were randomly coll...
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Universidade Federal de Campina Grande
2021-01-01
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| Series: | Revista Brasileira de Engenharia Agrícola e Ambiental |
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| author | Maria S. Lima Samuel V. Ferreira Lígia C. de M. Silva Daniel E. C. Oliveira Paulo V. T. Leão Marco A. P. Silva |
| author_facet | Maria S. Lima Samuel V. Ferreira Lígia C. de M. Silva Daniel E. C. Oliveira Paulo V. T. Leão Marco A. P. Silva |
| author_sort | Maria S. Lima |
| collection | DOAJ |
| description | ABSTRACT This study aimed to determine drying curves of land saffron (Curcuma longa L.) rhizomes at different temperatures and ventilation conditions to adjust non-linear regression models, and to calculate effective diffusion coefficients and activation energies. Saffron rhizomes were randomly collected in natura with a hoe from the soil in Rio Verde, Goiás, Brazil. They were subsequently sized, sanitized, and sliced into 2.63 ± 0.1 mm thick sections. Rhizomes were dried in an oven with forced air ventilation at 45, 55, 65 and 75 °C for 18, 14, 10 and 9 hours, respectively. As the temperature increased, drying time was reduced. Consequently, moisture content also decreased, facilitating the drying process by decreasing the energy required to remove water molecules. Among the analyzed models, the Midilli model was best adjusted to the data under different drying air conditions. Effective diffusion coefficients (D) were 9.17 × 10-11, 13.33 × 10-11, 20.09 × 10-11, and 35.89 × 10-11 m2 s-1 at 45, 55, 65 and 75 °C, respectively, increasing with higher temperatures. Activation energy for liquid diffusion during drying was 21.186 kJ mol-1. |
| format | Article |
| id | doaj-art-68cd0dd62dc2470f837fa8542ecb3a39 |
| institution | Kabale University |
| issn | 1807-1929 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Universidade Federal de Campina Grande |
| record_format | Article |
| series | Revista Brasileira de Engenharia Agrícola e Ambiental |
| spelling | doaj-art-68cd0dd62dc2470f837fa8542ecb3a392025-08-20T03:33:31ZengUniversidade Federal de Campina GrandeRevista Brasileira de Engenharia Agrícola e Ambiental1807-19292021-01-0125319720210.1590/1807-1929/agriambi.v25n3p197-202Modeling kinetics of convective drying of Curcuma longa L.Maria S. Limahttps://orcid.org/0000-0003-1679-1073Samuel V. Ferreirahttps://orcid.org/0000-0003-1544-191XLígia C. de M. Silvahttps://orcid.org/0000-0001-9058-975XDaniel E. C. Oliveirahttps://orcid.org/0000-0002-3824-994XPaulo V. T. Leãohttps://orcid.org/0000-0003-2213-1995Marco A. P. Silvahttps://orcid.org/0000-0002-3875-1104ABSTRACT This study aimed to determine drying curves of land saffron (Curcuma longa L.) rhizomes at different temperatures and ventilation conditions to adjust non-linear regression models, and to calculate effective diffusion coefficients and activation energies. Saffron rhizomes were randomly collected in natura with a hoe from the soil in Rio Verde, Goiás, Brazil. They were subsequently sized, sanitized, and sliced into 2.63 ± 0.1 mm thick sections. Rhizomes were dried in an oven with forced air ventilation at 45, 55, 65 and 75 °C for 18, 14, 10 and 9 hours, respectively. As the temperature increased, drying time was reduced. Consequently, moisture content also decreased, facilitating the drying process by decreasing the energy required to remove water molecules. Among the analyzed models, the Midilli model was best adjusted to the data under different drying air conditions. Effective diffusion coefficients (D) were 9.17 × 10-11, 13.33 × 10-11, 20.09 × 10-11, and 35.89 × 10-11 m2 s-1 at 45, 55, 65 and 75 °C, respectively, increasing with higher temperatures. Activation energy for liquid diffusion during drying was 21.186 kJ mol-1.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662021000300197&tlng=enland saffrondrying curveseffective diffusion coefficientMidilli model |
| spellingShingle | Maria S. Lima Samuel V. Ferreira Lígia C. de M. Silva Daniel E. C. Oliveira Paulo V. T. Leão Marco A. P. Silva Modeling kinetics of convective drying of Curcuma longa L. Revista Brasileira de Engenharia Agrícola e Ambiental land saffron drying curves effective diffusion coefficient Midilli model |
| title | Modeling kinetics of convective drying of Curcuma longa L. |
| title_full | Modeling kinetics of convective drying of Curcuma longa L. |
| title_fullStr | Modeling kinetics of convective drying of Curcuma longa L. |
| title_full_unstemmed | Modeling kinetics of convective drying of Curcuma longa L. |
| title_short | Modeling kinetics of convective drying of Curcuma longa L. |
| title_sort | modeling kinetics of convective drying of curcuma longa l |
| topic | land saffron drying curves effective diffusion coefficient Midilli model |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662021000300197&tlng=en |
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