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| Registros recuperados: 17 | |
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| Martins,Elton A. S.; Lage,Eduardo Z.; Goneli,André L. D.; Hartmann Filho,Cesar P.; Lopes,Jéssica G.. |
| Propôs-se, neste trabalho, avaliar a cinética de secagem de folhas de timbó (Serjania marginata Casar) e ajustar diferentes modelos matemáticos aos valores experimentais de razão de umidade. As folhas de timbó foram colhidas com teor de água inicial de 2,03 ± 0,10 decimal b.s., sendo submetidas à secagem sob condições controladas de temperatura (40, 50, 60 e 70 ºC), até o teor de água de 0,08 ± 0,02 decimal b.s. Aos dados experimentais foram ajustados dez modelos matemáticos utilizados para representação da secagem de produtos agrícolas. Com base nos resultados obtidos o modelo matemático de Midilli é o que melhor representa a cinética de secagem para as folhas de timbó. O aumento da temperatura promove: uma taxa maior de remoção de água nas folhas de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modelo de Midilli; Coeficiente de difusão; Propriedades termodinâmicas; Razão de umidade. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000300238 |
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| Martins,Elton A. S.; Goneli,André L. D.; Goncalves,Alexandre A.; Hartmann Filho,Cesar P.; Siqueira,Valdiney C.; Oba,Guilherme C.. |
| ABSTRACT 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Morus nigra L.; Medicinal plant; Air speeds; Midilli model. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000800570 |
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| Silva,Fernanda P. Da; Siqueira,Valdiney C.; Quinzani,Guilherme A.; Martins,Elton A. S.; Goneli,André L. D.. |
| ABSTRACT: The objectives of this study were to describe the process of drying niger seeds through the fitting of different mathematical models to the experimental drying data, to select the best model that represents the phenomenon, and to determine the diffusion coefficients and thermodynamic properties of the product. Seeds with an initial moisture content of 0.42 (d.b) were collected and dried at 40°, 50°, 60°, 70°, and 80°C in a fixed bed experimental dryer. After drying, different mathematical models were fitted to determine the diffusion coefficient by applying liquid diffusion theory, which allowed for calculation of the energy activation, enthalpy, entropy, and Gibbs free energy values. The Page model was selected to represent the drying process of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activation energy; Effective diffusion coefficient; Guizotia abyssinica Cass; Mathematical models. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400727 |
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| Goneli,André L. D.; Araujo,Willian D.; Hartmann Filho,Cesar P.; Martins,Elton A. S.; Oba,Guilherme C.. |
| ABSTRACT: The aim of this study was to adjust mathematical models to the experimental data on the peanut kernels drying in thin layer, as well as to determine the effective diffusion coefficient and the main thermodynamic properties involved in drying of the grains under different air conditions. The peanut kernels, with a water content of 0.59 ± 0.002 (dry basis, d.b.), were dried in a forced air ventilation oven with different temperature levels (40, 50, 60 and 70 °C) until reaching a water content of 0.04 ± 0.001 (d.b.). For the experimental data, eight mathematical models traditionally used to represent the drying kinetics of thin layer of agricultural products were adjusted, also being determined the effective diffusion coefficient and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arachis hypogaea L.; Effective diffusivity; Activation energy; Page model; Thermodynamic properties. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500994 |
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| Coradi,Paulo C.; Fernandes,Carlos H. P.; Helmich,Jean C.; Goneli,André L. D.. |
| ABSTRACT This study aimed to evaluate the effect of air-drying temperature and initial moisture content on volume shrinkage, physical quality and oil extraction yield of soybean grains. The grains used in this experiment were harvested at two distinct moisture levels of 19 and 25%. Then, these grains were taken to dryness at three different air temperatures of 75 °C, 90 °C and 105 °C, in a forced circulation convection oven of the air. The results showed a drying time reduction with increasing air temperatures. Regarding volume shrinkage, moisture content reductions influenced grain volume and the Rahman's model was the one that best fit the data. Moreover, the higher the air temperature, the greater the effects on soybean grain shrinkage and physical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Extraction; Performance; Processing. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000500866 |
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| Goneli,André L. D.; Corrêa,Paulo C.; Oliveira,Gabriel H. H. de; Resende,Osvaldo; Mauad,Munir. |
| ABSTRACT Sorption isotherms are of great importance in post-harvest procedures, especially for predicting drying and storage, which help to establish the final moisture content of the product under certain environmental condition. Hysteresis is a phenomenon that occurs due to the difference between adsorption and desorption curves, which aids the evaluation of chemical and microbiological deteriorations, indicating the stability of stored products. Moisture sorption isotherms of castor beans were determined and hysteresis was analyzed. Static gravimetric technique at different temperatures (25, 35, 45 and 55 ± 1 °C) was used. Saturated salt solutions in the range of 37-87% ± 2% were utilized to create the required controlled relative humidity environment.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Equilibrium moisture content; Mathematical modeling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800751 |
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| Goneli,André L. D.; Corrêa,Paulo C.; Oliveira,Gabriel H. H. de; Oliveira,Ana P. L. R. de; Orlando,Roberto C.. |
| ABSTRACT Knowledge on the water sorption within agricultural products is extremely important for decision making during post-harvest procedures. In order to improve this knowledge, thermodynamic properties regarding water sorption provide useful data. Thermodynamic properties of castor beans, related to sorption, were determined. Static gravimetric technique under different conditions of temperature (25, 35, 45 and 55 ± 1 °C) was used. Saturated salt solutions in the range of 37-87% ± 2% were utilized to create the required controlled humidity environment. After the sorption procedure, differential enthalpy, differential entropy and Gibbs free energy of this process were calculated and decreased with increased values of equilibrium moisture content. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Moisture content; Enthalpy–entropy compensation theory. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800757 |
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| Martins,Elton A. S.; Goneli,André L. D.; Hartmann Filho,Cesar P.; Mauad,Munir; Siqueira,Valdiney C.; Gonçalves,Alexandre A.. |
| ABSTRACT Safflower is an oil crop and its oil can be used for food and industrial purposes. However, there is little information about the physical properties of these grains, which is important for the planning and execution of post-harvest stages. Thus, this study was carried out with the aim of evaluating the effect of drying on the main physical properties of safflower grains. Safflower grains were harvested with an initial moisture content of approximately 0.445 decimal d.b. (dry basis) and subjected to drying in an oven with forced air circulation at 40 °C, until the grains reached a final moisture content of 0.073 ± 0.008 decimal d.b. During the drying, bulk density and true density, porosity, thousand-grain mass, circularity, sphericity, projected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carthamus tinctorius L.; Bulk density; Shape of grains. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500344 |
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| Andrade,José C. de; Goneli,André L. D.; Hartmann Filho,Cesar P.; Goes,Rafael H. de T. E B. de; Gonçalves,Alexandre A.. |
| ABSTRACT: The gap in the storage industry has brought a series of problems for the agro industrial market today, as its ability to directly infer the quality of newly collected material. The present study was carried out with the objective of evaluating the quality of second crop corn harvested with different water contents depending on the period until drying. The corn grains were harvested with moisture contents of approximately 28.5; 22.4; 21 and 19%, and subjected to temporary storage for ten days, simulating the time between harvest and drying. In the period, every two days the quality was evaluated by determining the specific mass, electrical conductivity, color, crude protein content, ethereal extract, ashes and carbohydrates. Based on the obtained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Grain quality; Post-harvest. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000501004 |
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| Araujo,Willian D.; Goneli,André L. D.; Souza,Cristiano M. A. de; Gonçalves,Alexandre A.; Vilhasanti,Henrique C. B.. |
| Objetivou-se, com o presente trabalho, avaliar o efeito da secagem sobre as características físicas dos grãos de amendoim. Foram utilizados grãos de amendoim com teor inicial de água de aproximadamente 0,56 decimal (base seca) e submetidos à secagem com temperatura de 40 ºC. Foram determinadas as propriedades físicas: massa específica aparente, massa específica unitária, porosidade intergranular, massa de mil grãos, esfericidade, circularidade, área projetada, área superficial e a relação superfície/volume. Com base nos resultados obtidos conclui-se que a redução do teor de água proporcina redução em todas as propriedades físicas dos grãos de amendoim com exceção da porosidade e da relação superfície/volume que tiveram seus valores aumentados com a redução... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arachis hypogaea L.; Massa específica aparente; Porosidade; Teor de água; Esfericidade. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000300006 |
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| Ribeiro,Deise M.; Corrêa,Paulo C.; Furtado,Bruno F.; Goneli,André L. D.; Resende,Osvaldo. |
| O presente trabalho teve como objetivo verificar a influência do teor de água nos valores da força máxima de compressão para uma deformação fixa (2 mm) e do módulo proporcional de deformidade de grãos de soja submetidos à compressão em diferentes posições. Foram utilizados grãos com teores de água variando de 0,58 a 0,093 (b.s.), comprimidos uniaxialmente entre duas placas paralelas, na direção de suas três dimensões principais, sob velocidade de compressão de 0,001 m s-1. A partir dos resultados obtidos, concluiu-se que a força de compressão e o módulo proporcional de deformidade diminuem com o aumento do teor de água. Além disso, os grãos de soja apresentam maior resistência à compressão quando submetidos a esforços na posição de repouso (P1),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Propriedades reológicas; Módulo proporcional de deformidade; Secagem. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162007000300019 |
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| Andrade,José C. de; Goneli,André L. D.; Hartmann Filho,Cesar P.; Azambuja,Thalita M. S. de; Barboza,Valdenise C.. |
| ABSTRACT The objective of this study was to evaluate the quality of second-crop corn harvested with different moisture contents as a function of time before drying. The corn grains were harvested with moisture content of 28.5, 22.4, 21 and 19%, and submitted to a temporary storage for ten days, simulating the time between harvesting and drying. Quality was subsequently evaluated every two days, based on the commercial classification of the grains, sanity test and dry bulk density. The results showed that: the increase in moisture content at harvest affects the physical and sanitary quality of second-crop corn, and this effect is aggravated over time; the moisture content of 19% is the one that least affects grain quality during the ten days of temporary... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Physical and sanitary quality of grains; Post-harvest. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100803 |
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| Goneli,André L. D.; Corrêa,Paulo C.; Figueiredo Neto,Acácio; Kirsch,Michele R. H.; Botelho,Fernando M.. |
| ABSTRACT Knowledge regarding the static pressure drop in granular layers is of fundamental importance in the development of efficient drying and aeration projects of agricultural products. Thus, the objective of this study was to evaluate the effects of impurity contents on the static pressure drop in different bed depth of castor bean grains, as well as modify the mathematical models per the obtained experimental data and select the model that best represents this phenomenon. First, impurities in castor bean grains of the Guarani variety were eliminated and 6% of the moisture content (dry basis) was retained. The coarse impurity contents were obtained with 2%, 4%, and 6% of mass addition. The pressure drop in different bed depth of clean and impure castor... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Load loss; Porosity; Ricinus communis L.; Moisture content. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000200184 |
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| Registros recuperados: 17 | |
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