Cinética de secagem e difusividade efetiva em folhas de jenipapo (Genipa americana L.)

Silva, L.A.; Resende, Osvaldo; Virgolino, Zirvaldo Z.; Bessa, Jaqueline Ferreira Vieira; Morais, Wilker Alves; Vidal, Vitor Marques

doi:10.1590/1983-084x/14_106

Cited by 20 publications

(17 citation statements)

References 25 publications

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“…An increase of D was observed as the drying air temperature increased during the drying of C. pachystachya leaves. Increments in D increased with increasing of air temperature (Figure 2A), corroborating several studies that have reported the same behavior with increase in drying air temperature (Rodríguez et al, 2014;Dai et al, 2015;Silva et al, 2015;Akpinar & Toraman, 2016;Mghazli et al, 2017). Figure 2B presents the relationship between effective diffusivity and temperature, expressed by the Arrhenius equation.…”

Section: Resultssupporting

confidence: 87%

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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Section: Resultssupporting

confidence: 87%

Drying Kinetics of Cecropia pachystachya Leaves

et al. 2019

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“…Activation energy values did not vary much as a function of the variation in drying air speed; these values are higher than those found by other researchers working with medicinal plants, such as Cymbopogon citratus leaves (53.76 kJ mol -1 ) (Gomes et al, 2017), 'fruta-de-lobo' leaves (44.60 kJ mol -1 ) (Prates et al, 2012), 'jenipapo' leaves (33.87 kJ mol -1 ) (Silva et al, 2015).…”

Section: Resultsmentioning

confidence: 62%

“…( Figure 2). This phenomenon was observed by Radünz et al (2011), who assessed the drying kinetics of 'carqueja' , as well as other researchers studying the drying kinetics of other medicinal plants, such as Prates et al (2012) with 'fruta-de-lobo' leaves, Goneli et al (2014) with 'aroeira' leaves, Martins et al (2015) with 'timbó' leaves, Silva et al (2015) with 'jenipapo' , Gasparin et al (2017) with Mentha piperita leaves.…”

Section: Resultsmentioning

confidence: 72%

“…Gasparin et al (2017), studying the drying kinetics of Mentha piperita leaves at different drying air temperatures and speeds, also found that the model which fitted best to the observed data was the Midilli model. Other researchers have also found that the Midilli model was the most adequate to represent the thin-layer drying of medicinal plants, such as Gomes et al (2017) with Cymbopogon citratus leaves, Silva et al (2015) with 'jenipapo' leaves, Martins et. al (2015) with 'timbó' leaves and Goneli et al (2014) with 'aroeira' leaves.…”

Section: Resultsmentioning

confidence: 97%

“…Mathematical models traditionally used to predict the thinlayer drying of agricultural products were fitted to the moisture content data observed during the drying of blackberry leaves. The mathematical models presented in Table 1 have been used by various researchers in studies with leaves of medicinal plants (Prates et al, 2012;Goneli et al, 2014;Martins et al, 2015;Silva et al, 2015;Gasparin et al, 2017;Gomes et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

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Drying kinetics of blackberry leaves

Martins

Goneli

Gonçalves

et al. 2018

Rev. bras. eng. agríc. ambient.

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Blackberry leaves have some pharmacological properties and one of the most widespread and studied uses is to relieve symptoms of the climacteric and other symptoms during the premenstrual period. Thus, drying becomes important for the conservation and storage of the product until its use or processing. The present study aimed to evaluate the drying kinetics of blackberry leaves, as well as to determine the effective diffusion coefficient and the activation energy during the drying process. Blackberry leaves were dried in an experimental fixed-bed dryer under four controlled temperature conditions (40, 50, 60 and 70 °C) and two drying air speeds (0.4 and 0.8 m s-1). With the experimental data of moisture ratio, eight mathematical models were fitted to represent the process of thin-layer drying of agricultural products. Based on the obtained results, it was found that the Midilli model represented best the phenomenon of drying of blackberry leaves. The increase in temperature and air speed reduced the drying time of blackberry leaves and increased the values of the effective diffusion coefficient. This relation can be described by the Arrhenius equation, which has an activation energy for the liquid diffusion during drying of 65.94 and 66.08 kJ mol-1, for drying air speeds of 0.4 and 0.8 m s-1, respectively.

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Drying kinetics and thermodynamic properties of guava peel

Silva,

Souza,

Mesquita

et al. 2024

Cienc. Rural

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The drying agroindustrial products is used to preserve the sensory and nutritional quality and to reduce the biological activity, preventing deterioration and loss of commercial value. The objective was to study the mathematical modeling Guava bark drying to obtain flour and to determine and evaluate the effective diffusion coefficient, get the activation energy and the thermodynamic properties in drying temperatures of 45, 55, 65 and 75 °C. The experiment was conducted Instituto Federal Goiano - Campus Rio Verde, the guava was purchased in local shops in the city of Rio Verde Goiás, in the commercial maturity. Among the analyzed models, Midilli was the best to represent the drying phenomenon. The effective diffusion coefficient increased with increasing temperature and the activation energy for liquid diffusion drying was 37,207kJ mol-1. The enthalpy and entropy increased with increasing drying temperature. While the Gibbs free energy increased with increasing drying temperature.

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Cinética de secagem e difusividade efetiva em folhas de jenipapo (Genipa americana L.)

Cited by 20 publications

References 25 publications

Drying Kinetics of Cecropia pachystachya Leaves

Drying Kinetics of Cecropia pachystachya Leaves

Drying kinetics of blackberry leaves

Drying kinetics and thermodynamic properties of guava peel

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