Experimental dryer design for agricultural products

Goneli, André Luís Duarte; Martins, Elton Aparecido Siqueira; Jordan, Rodrigo Aparecido; Geisenhoff, Luciano Oliveira; Garcia, Renato Tertuliano

doi:10.1590/1809-4430-eng.agric.v36n5p938-950/2016

Cited by 7 publications

(5 citation statements)

References 23 publications

(8 reference statements)

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“…Para o início de projetos ou adaptações de estruturas e equipamentos utilizados na póscolheita, tais como silos e sistemas de transporte, secagem, limpeza, classificação e aeração, é fundamental a obtenção de dados referentes às principais propriedades físicas do produto trabalhado (GONELI et al, 2016;CARVALHO, 2015). Dentre essas propriedades, podem ser citadas a massa específica aparente, porosidade intergranular, circularidade, esfericidade, área projetada e superficial, entre outras.…”

Section: Introductionunclassified

Caracterização Física Das Sementes De Feijão-Caupi, Cultivar BRS Guariba, Durante O Processo De Secagem

et al. 2019

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CARACTERIZAÇÃO FÍSICA DAS SEMENTES DE FEIJÃO-CAUPI, CULTIVAR BRS GUARIBA, DURANTE O PROCESSO DE SECAGEM GUILHERME CARDOSO OBA1, ANDRÉ LUÍS DUARTE GONELI2, ELTON APARECIDO SIQUEIRA MARTINS2, CESAR PEDRO HARTMANN FILHO1, ALEXANDRE ALVES GONÇALVES1 1 Programa de Pós-Graduação em Agronomia da Universidade Federal da Grande Dourados – UFGD, Rodovia Dourados/Itahum, Km 12 - Unidade II, Cep: 79.804-970, Dourados-MS, Brasil. E-mails: guilherme_oba@hotmail.com; cphartmann21@hotmail.com; alexandre_alvesg@hotmail.com 2 Faculdade de Ciências Agrárias da UFGD, Rodovia Dourados/Itahum, Km 12 - Unidade II, Cep: 79.804-970, Dourados-MS, Brasil. E-mails: andregoneli@ufgd.edu.br; elton_asm@yahoo.com.br RESUMO: Os produtos agrícolas podem apresentar alterações significativas em seus caracteres físicos, como tamanho e forma, quando submetidos a condições capazes de modificar seu teor de água. Assim, objetivou-se caracterizar a variação das principais propriedades físicas das sementes de feijão-caupi, cultivar BRS Guariba, durante o processo de secagem. As sementes, colhidas com um teor de água de 0,47 base seca (b.s.), foram secas em estufa de ventilação forçada de ar, a 40 °C, até atingirem 0,11 b.s. Durante a secagem, determinaram-se as seguintes propriedades físicas: volume da massa e unitária, diâmetro geométrico, área projetada e superficial, circularidade, esfericidade, porosidade intergranular e massa específica aparente e real. Avaliou-se ainda, por meio dos volumes determinados, a contração volumétrica da massa e unitária das sementes. Constatou-se que ambas as contrações volumétricas podem ser representadas pelos modelos de Bala e Woods modificado (1984), Corrêa et al. (2004), Exponencial, Polinomial de primeiro e segundo grau e Rahman (1995). O decréscimo do teor de água resulta no aumento da massa específica aparente e na redução das magnitudes das demais propriedades físicas, exceto a circularidade e esfericidade, que sofrem pouca alteração na faixa de teor de água avaliada. Palavras-Chave: propriedades físicas, teor de água, Vigna unguiculata (L.) Walp. PHYSICAL CHARACTERIZATION OF COWPEA SEEDS, BRS GUARIBA CULTIVAR, DURING DRYING PROCESS ABSTRACT: Agricultural products may present significant changes in their physical characteristics, such as size and shape, when subjected to capable conditions to modifying their moisture content. Thus, it was aimed to characterize the variation of the main physical properties of cowpea seeds, BRS Guariba cultivar, during drying process. Seeds, harvested with a moisture content of 0.47 dry basis (d.b.), were dried in forced air ventilation oven, at 40 °C, until they reaching 0.11 d.b. During drying process, the following physical properties were determined: mass and unit volume, geometric diameter, projected and superficial area, circularity, sphericity, intergranular porosity, bulk and true density. Also, mass volumetric shrinkage and seeds unit was evaluated through the determined volumes. It was found that both volumetric shrinkages can be represented by the modified Bala and Woods (1984), Corrêa et al. (2004), Exponential, Polinomial of first and second degree and Rahman (1995) models. The decrease in the moisture content results in the increase of the bulk density and in the reduction of the magnitudes of the other physical properties, except the circularity and sphericity, that undergo little change in the evaluated moisture content range. Keywords: physical properties, moisture content, Vigna unguiculata (L.) Walp.

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Section: Introductionunclassified

Caracterização Física Das Sementes De Feijão-Caupi, Cultivar BRS Guariba, Durante O Processo De Secagem

et al. 2019

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“…Each triplicate contained approximately 7 g of leaves, which had an initial moisture content of approximately 2.76 (decimal, d.b.). The rest of the sample was immediately dried in an experimental fixedbed dryer, as described by Goneli et al (2016). Drying was performed for various drying air conditions (Table 1), until the leaves reached the final moisture content of approximately 0.11 (decimal, d.b.).…”

Section: Methodsmentioning

confidence: 99%

Post-harvesting of Solanum paniculatum L. leaves. Part II: Antioxidant activity and chemical composition

Martins

Goneli

Cardoso

et al. 2021

Rev. bras. eng. agríc. ambient.

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‘Jurubeba’ (Solanum paniculatum L.) is a medicinal plant used in traditional medicine for liver problems, in addition to being used as a cholagogue, emmenagogue, healing agent, febrifuge, anti-inflammatory, antipyretic, tonic, decongestant, diuretic and against inappetence. Thus, the objective of this study was to evaluate the antioxidant activity, concentration of phenolic compounds and total alkaloids of aqueous extracts prepared from ‘Jurubeba’ leaves subjected to drying. ‘Jurubeba’ leaves were dried at different temperatures (40, 50, 60 and 70 °C) and velocities (0.4 and 0.8 m s-1) of the drying air. Aqueous extracts of the leaves, subjected to drying, were evaluated by absorbance reading in a spectrophotometer. Increase in drying air temperature reduced the contents of total phenolics and total alkaloids of the leaf aqueous extracts, whereas increment in air velocity increased the concentration of these substances. Antioxidant activity was not influenced by the increase in air temperature at air velocity of 0.4 m s-1, but under air velocity of 0.8 m s-1 there was reduction with increasing temperature. Drying of ‘Jurubeba’ leaves can be carried out with temperature of 40 or 50 °C and drying air velocity of 0.4 m s-1.

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“…In a steady state, the amount of air supplied to the drying chamber S a(in * ) (Figure 3) can be determined empirically based on two parameters specified by the manufacturer: fan specifications and the hydraulic resistance of a grain layer through which air is passed [47]. Hydraulic resistance is determined by the dryer's structure, grain filling level, grain type, and its moisture content [48][49][50].…”

Section: Drying Air Sourcementioning

confidence: 99%

Generalized Mathematical Model of the Grain Drying Process

Myhan

Markowski²

2022

Processes

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Convective cereal grain drying is an energy-intensive process. Mathematical models are applied to analyze and optimize grain drying processes in different types of dryers and in different stages of drying to improve final grain quality and reduce energy consumption. The aim of the present study was to develop a generalized mathematical model of the grain drying process that accounts for all drying stages, including loading and unloading of unprocessed grain, drying, and cooling of dry grain. The developed mathematical model is a system of algebraic equations, where the calculated coefficients are determined by the thermophysical and diffusive properties of dried grain. The model was validated for batch drying of wheat, canola, and corn grain, as well as continuous flow drying of wheat grain. The results were compared with published findings. The relationships between energy consumption during drying and drying time vs. air temperature at the dryer inlet and air stream volume were determined. Dryer capacity and drying conditions specified by the manufacturers, as well as loading and unloading capacity, were considered during batch drying. Continuous flow drying simulations were conducted in counter-flow, parallel-flow, and cross-flow mode. Simulation results indicate that the proposed models correctly depicted process flow in both batch and continuous flow dryers.

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Experimental dryer design for agricultural products

Cited by 7 publications

References 23 publications

Caracterização Física Das Sementes De Feijão-Caupi, Cultivar BRS Guariba, Durante O Processo De Secagem

Caracterização Física Das Sementes De Feijão-Caupi, Cultivar BRS Guariba, Durante O Processo De Secagem

Post-harvesting of Solanum paniculatum L. leaves. Part II: Antioxidant activity and chemical composition

Generalized Mathematical Model of the Grain Drying Process

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