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| Siqueira,Valdiney Cambuy; Resende,Osvaldo; Chaves,Tarcísio Honório. |
| The jatropha has emerged on the world scene as a promising plant for the production of biodiesel. However, this crop still lacks the development of specific equipment for its processing, particularly post-harvest. Therefore, the aim of this work was to fit different mathematical models to experimental data obtained while drying jatropha fruits, and to recommend the one that best represents the facts. Jatropha fruit with a moisture content of 4.4 (kg moisture kg-1 dry matter) were subjected to drying in a greenhouse with forced air-ventilation at five temperature conditions: 45; 60; 75; 90 and 10 ºC and relative humidities of 14.5; 7.4; 3.8; 2.2 and 1.4%, respectively, until reaching a moisture content of 0.10 ± 0.005 (kg moisture kg-1 dry matter),with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiesel; Drying temperatures; Mathematical models. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200009 |
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| Mabasso,Geraldo Acácio; Siqueira,Valdiney Cambuy; Quequeto,Wellytton Darci; Resende,Osvaldo; Goneli,André Luís Duarte. |
| ABSTRACT Mechanical properties of agricultural products are essential for a proper project design or processing equipment dimensioning, as well as for establishment of parameters on the supported load. An experiment was set up in a completely randomized design, with five treatments (continuous and intermittent drying under 4, 8, 12, and 16 h of rest period) and four replications, to evaluate the effect of intermittent drying. Corn kernels of the cultivar Cargo TL were harvested with a moisture content of 25.37% wb and submitted to drying in an experimental fixed bed dryer set to a temperature of 100 °C and an airflow of 1.5 m3 min-1 m-2. Drying was performed until the kernels reached a moisture content of 14±0.3% wb. The process was interrupted in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intermittent drying; Mechanical properties; Rupture force; Hardness; Drying rate. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400415 |
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| Resende,Osvaldo; Rodrigues,Silvestre; Siqueira,Valdiney Cambuy; Arcanjo,Renan Vieira. |
| Objetivou-se com o presente trabalho estudar a cinética da secagem de quatro clones de café da espécie Coffea canephora submetidos à secagem em terreiro de chão batido, bem como ajustar diferentes modelos matemáticos aos valores experimentais selecionando aquele que melhor representa o fenômeno em estudo. Foram utilizados frutos de café dos clones: Cpafro 194, Cpafro 193, Cpafro 167 e Cpafro180, colhidos com os teores de água iniciais de 1,20; 1,32; 1,51 e 1,46 (decimal base seca (b.s.)), respectivamente. A secagem prosseguiu em terreiro de chão batido até que o produto atingisse o teor de água de 0,137; 0,133; 0,142 e 0,140 (decimal b.s.) respectivamente para os clones Cpafro 194, Cpafro 193, Cpafro 167 e Cpafro 180. Aos dados experimentais foram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modelagem matemática; Teor de água; Processamento; Pós-colheita. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000200002 |
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| Siqueira,Valdiney Cambuy; Leite,Rafael Araújo; Mabasso,Geraldo Acácio; Martins,Elton Aparecido Siqueira; Quequeto,Wellytton Darci; Isquierdo,Eder Pedroza. |
| ABSTRACT Buckwheat has become important in the food sector as its flour does not contain gluten. Since buckwheat is a relatively new crop in the agricultural environment, there is little information available regarding its processing. Drying is one of the most important post-harvest stages of buckwheat. The aim of the present study was to describe the drying process of buckwheat grains. Buckwheat grains with a moisture content of 0.41 ± 0.01 (dry basis, d.b.) were harvested, followed by drying in an experimental dryer at the temperatures of 40, 50, 60, 70, and 80 °C, at an air speed of 0.8 m s-1. The drying rate was determined, and the mathematical models generally employed to describe the drying process of several agricultural products were fitted to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activation energy; Fagopyrum esculentum Moench; Mathematical models; AIC and BIC; Gluten. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100235 |
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| Isquierdo,Eder Pedroza; Borém,Flávio Meira; Oliveira,Pedro Damasceno de; Siqueira,Valdiney Cambuy; Alves,Guilherme Euripedes. |
| Rest periods during the coffee drying process may help improve the final coffee quality and reduce power consumption. The objective of the present study was to evaluate the effect of the moisture content of coffee fruit at the point when the drying process is temporarily interrupted on the quality of natural coffee using sensory analysis and electrical conductivity and potassium leaching tests. Ripe coffee fruits were manually and selectively harvested, sun-dried in a concrete yard for two days and subjected to mechanical drying in fixed-bed dryers. When the coffee reached moisture contents of 20%, 17% and 14% (wet basis, wb), the drying process was interrupted, and the coffee was allowed to remain at rest for 5, 15 or 30 days. Following this rest period,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parceling of the drying; Dry method processing; Sensory analysis. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400008 |
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| Resende,Osvaldo; Afonso Júnior,Paulo Cesar; Corrêa,Paulo César; Siqueira,Valdiney Cambuy. |
| Avaliar a qualidade do café conilon (Coffea Canephora Pierre) depois da secagem em terreiro híbrido e de concreto, processado por via seca para as condições climáticas do Estado de Rondônia, foi o principal objetivo deste trabalho. O café foi colhido, manualmente, pelo sistema de derriça no pano, com teor de água de aproximadamente 50% (b.u.), separado por diferença de massa específica em três grupos: cerejas, boia e café mistura. Posteriormente, cada um dos grupos foi dividido em dois lotes e submetidos à secagem em terreiro híbrido e terreiro de concreto. A análise sensorial foi realizada pela degustação por especialista e a qualidade química do produto foi avaliada por meio das análises da acidez titulável, sólidos solúveis totais e condutividade... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pós-colheita; Redução do teor de água. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000200014 |
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