Thermodynamic properties and drying kinetics of Bauhinia forficata Link leaves

Silva, Fernanda P. da; Siqueira, Valdiney Cambuy; Martins, Elton Aparecido Siqueira; Miranda, Fábio M. N.; Melo, R. M. C. A.

doi:10.1590/1807-1929/agriambi.v21n1p61-67

Cited by 17 publications

(24 citation statements)

References 18 publications

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“…Thickness (L) was measured using a digital micrometer, with resolution of 0.001 mm. To obtain the average thickness of Piper aduncum leaves, 50 leaves were randomly chosen among the set of leaves which were going to be dried, and readings were taken at six preestablished points, three on each side of the midrib (Silva et al, 2017).…”

Section: Mathematical Modeling and Diffusion Coefficientmentioning

confidence: 99%

“…According to Silva, Siqueira, Martins, Miranda and Melo (2017), along the drying process it is interesting to not only describe the drying kinetics, but also to monitor the thermodynamic properties. They provide important information on the properties of water and on the energy required in the process, such as enthalpy and entropy, which characterize variations existing in the water-product system (Corrêa, Oliveira, Botelho, Goneli, & Carvalho, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Thin-Layer Drying Kinetics of Piper aduncum L. Leaves

Quequeto¹,

Siqueira²,

Mabasso³

et al. 2019

JAS

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As well as most agricultural products, some medicinal plants need to go through a drying process to ensure quality maintenance, however each product behaves differently. Therefore, the present study aimed to evaluate the drying kinetics of spiked pepper (Piper aduncum L.) leaves and determine their thermodynamic properties at different drying temperatures in laboratory scale. Leaves with initial moisture content of 78% w.b. (wet basis) were subjected to drying at temperatures of 40, 50, 60 and 70 ºC and air speed of 0.85 m s-1 in an experimental fixed bed dryer. The drying kinetics of the leaves was described by statistical fitting of mathematical models and determination of effective diffusion coefficient and activation energy. Enthalpy, entropy and Gibbs free energy were also evaluated for all drying conditions. It was concluded that, among the models evaluated, only Midilli and Valcam can be used to represent the drying of Piper aduncum leaves; the first for the two highest temperatures (60 and 70 ºC) and the second for 40 and 50 ºC. The activation energy was approximately 55.64 kJ mol-1, and the effective diffusion coefficient increase with the elevation of temperature. The same occurs with the values of Gibbs free energy, whereas the specific enthalpy and entropy decrease.

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Section: Mathematical Modeling and Diffusion Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Thin-Layer Drying Kinetics of Piper aduncum L. Leaves

Quequeto¹,

Siqueira²,

Mabasso³

et al. 2019

JAS

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“…Such resistance is probably caused by the higher rigidity and thickness of C. pachystachya leaves, but Silva et al (2017a) highlight the importance of also considering the chemical composition as a factor that influences diffusivity.…”

Section: Resultsmentioning

confidence: 99%

“…Various drying conditions should be tested to adjust the characteristics of each product during moisture content reduction, and theoretical mathematical models have been constantly used in literature to predict this phenomenon (Silva et al, 2017a;Maciel et al, 2017;Sonmete et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Drying Kinetics of Cecropia pachystachya Leaves

et al. 2019

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The species Cecropia pachystachya has important medicinal purposes and its leaves have been used in pharmaceutical research, so the drying of this product may help maintaining its chemical properties and ensure safe storage. Thus, the objective of this study was to select mathematical models to represent the drying kinetics of Cecropia pachystachya leaves, determine the effective diffusion coefficient and obtain the activation energy during drying at different temperatures. Leaves were dried in an oven under five temperature conditions (40, 50, 60 and 70 °C), until reaching hygroscopic equilibrium moisture content. Among the models analyzed, the Logarithmic model best represented the drying kinetics at temperatures of 40 and 60 °C, whereas Modified Henderson & Pabis and Dryceleaves represented temperatures of 50 and 70 °C, respectively. The effective diffusion coefficient increased with increasing air temperature, and the activation energy for liquid diffusion in the drying process was 64.53 kJ mol-1.

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“…The drying of leaves of medicinal plants has been studied by several researchers, aiming to provide technical information of this important post-harvest stage for the more efficient processing of these products. Most studies of drying of leaves of medicinal plants evaluate only the effect of different drying air temperatures on the process (Reis et al, 2012;Goneli et al, 2014;Silva et al, 2015;Melo et al, 2016;Silva et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Post-harvesting of Solanum paniculatum L. leaves. Part I: Drying kinetics

Martins

Goneli

Gonçalves

et al. 2020

Rev. bras. eng. agríc. ambient.

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Solanum paniculatum L. (jurubeba) is among the numerous medicinal plants used by the Brazilian population, and the use of its leaves is quite popular, in the form of tea, as a remedy against hangovers after excessive consumption of alcohol and food, besides being used in the form of ointments as healing agent and also in the treatment of liver and digestive problems. Leaves of medicinal plants usually have a high moisture content, requiring its reduction by drying, so that the product can be stored safely until its processing. The objective of this study was to evaluate the drying kinetics of jurubeba leaves and to determine the effective diffusion coefficient and activation energy during drying. Jurubeba leaves were dried at different air temperatures (30, 40, 50, 60 and 70 °C) and speed (0.4 and 0.8 m s-1). The Midilli model satisfactorily fitted to the observed data of drying of jurubeba leaves for all air conditions. Increasing the drying air temperature and speed reduced the drying time and increased the effective diffusion coefficient. For the air temperature range from 40 to 70 °C, as the drying air speed increases, the activation energy for the drying of the jurubeba leaves is reduced.

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Thermodynamic properties and drying kinetics of Bauhinia forficata Link leaves

Cited by 17 publications

References 18 publications

Mathematical Modeling of Thin-Layer Drying Kinetics of Piper aduncum L. Leaves

Mathematical Modeling of Thin-Layer Drying Kinetics of Piper aduncum L. Leaves

Drying Kinetics of Cecropia pachystachya Leaves

Post-harvesting of Solanum paniculatum L. leaves. Part I: Drying kinetics

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