Simulation of soya bean flow in mixed-flow dryers using DEM

Khatchatourian, Oleg; Binelo, Manuel Osório; Lima, Rodolfo França de

doi:10.1016/j.biosystemseng.2014.05.003

Cited by 21 publications

(9 citation statements)

References 23 publications

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“…Algumas hipóteses apresentadas em [2] e [4] referentes ao MED foram adotadas na realização desta pesquisa, de modo a simplificar o problema em estudo. Destaca-se:…”

Section: Método Dos Elementos Discretosunclassified

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Estudo dos Efeitos das Propriedades Morfológicas Sobre o Escoamento de Grãos de Aveia

Balbinot¹,

Binelo²,

Khatchatourian³

et al. 2018

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

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Resumo O presente trabalho tem por objetivo a modelagem matemática e computacional do escoamento de grãos de aveia aplicando o Método dos Elementos Discretos, a fim de investigar o impacto da morfologia do grão no seu escoamento. Para tanto, foram realizados experimentos em laboratório a fim de coletar dados sobre oângulo repouso dos grãos de aveia e o tempo de escoamento dos grãos pelo corpo de uma calha experimental. Posteriormente, foi criado um modelo computacional da calha, idêntico ao modelo utilizado nos experimentos, no software Yade, que implementa o Método dos Elementos Discretos. Para validar o modelo escolhido, os resultados simulados foram comparados com os dados experimentais. Os resultados alcançados neste estudo mostram que o Método dos Elementos Discretosé capaz de prever o fluxo de descarga dos grãos de aveia com boa precisão. Além disso, verificou-se que a utilização de clumps de esferas para aproximar a geometria do grão de aveia torna o método muito mais consistente com os dados reais. Palavras-chave. Método dos Elementos Discretos, Modelagem Matemática, ModelagemComputacional. IntroduçãoAtualmente existem no mercado diferentes tipos de secadores que visam atender desde pequenos até grandes produtores. Entre os secadores existentes destaca-se o secador de fluxo misto queé amplamente utilizado na agricultura, porém ainda existe a necessidade de otimizar o processo envolvido em tal secador, visto que o fluxo de grãos pelo corpo do secador não foi suficientemente analisado e estudado [7]. A criação de modelos matemáticos capazes de predizer o fluxo de grãosé de extrema importância para o projetos de secadores de grãos mais eficientes. A modelagem matemática do escoamento de grãos mais próximos de esferas, como a soja, foi realizada em trabalhos como [4], mas grãos com pouco esfericidade, como a aveia, são um desafio mais complexo.

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“…Algumas hipóteses apresentadas em [2] e [4] referentes ao MED foram adotadas na realização desta pesquisa, de modo a simplificar o problema em estudo. Destaca-se:…”

Section: Método Dos Elementos Discretosunclassified

“…A criação de modelos matemáticos capazes de predizer o fluxo de grãosé de extrema importância para o projetos de secadores de grãos mais eficientes. A modelagem matemática do escoamento de grãos mais próximos de esferas, como a soja, foi realizada em trabalhos como [4], mas grãos com pouco esfericidade, como a aveia, são um desafio mais complexo. …”

unclassified

Estudo dos Efeitos das Propriedades Morfológicas Sobre o Escoamento de Grãos de Aveia

Balbinot¹,

Binelo²,

Khatchatourian³

et al. 2018

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

View full text Add to dashboard Cite

show abstract

“…With the development of computer technology, DEM has been regarded as a powerful tool to simulate the dynamic behavior of granular materials in agricultural engineering, such as seeding [1][2][3][4] , tillage [5][6][7] and grain drying [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Modeling of flexible wheat straw by discrete element method and its parameters calibration

Liu

Zhang

Chen

2018

International Journal of Agricultural and Biological Engineering

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Abstract:To simulate the bending behavior of wheat straw, a flexible straw model was developed based on the Hertz-Mindlin with bonding model using discrete element method. The proposed model was constructed by bonding straw units (filled by multi-spherical method) through parallel bonding keys. By means of a three-point bending test, single-factor sensitivity analysis and calibration of bonding parameters were performed. Results showed that elastic modulus of the flexible straw enhanced with the increase of bonded disk radius, normal stiffness per unit area and shear stiffness per unit area. The three bonding parameters were respectively calibrated to be 2.11 mm, 9.48×10 9 N/m 3 and 4.67×10 9 N/m 3 by solving the regression equation developed from Box-Behnken design. The simulated elastic modulus (in terms of those three calibrated parameters) exhibited 4.20% difference with the measured one. It proved that the flexible straw could accurately demonstrate bending property of the wheat straw. This would not only help to improve accuracy in simulating wheat straw, but also provide references for flexible straw modeling and parameters calibration of other crops.

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“…The seed metering devices were simulated on EDEM by using a Hertz-Mindlin no-slip contact model [22,24] . The setting of global parameters is shown in Table 1.…”

Section: Dem Simulationmentioning

confidence: 99%

“…Thus, mechanical seed metering devices guarantee high seeding efficiency under medium-and low-speed practices. For instance, the vertical-disc hole-typed soybean seed metering device developed by Kinze reaches a seeding qualified index above 90% under the working speed of 8 km/h, but its qualified index of seed spacing under high-speed practices is low [21,22] .…”

Section: Introductionmentioning

confidence: 99%

Design and key parameter optimization of an agitated soybean seed metering device with horizontal seed filling

Chen

Zhao

et al. 2018

International Journal of Agricultural and Biological Engineering

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Abstract:Since the low seed filling speed of mechanical seed metering devices reduces the low qualified rate of seed spacing during high-speed practices, it is significant to design agitated seed metering devices with horizontal seed filling that are suitable for high-speed practices. The combination of horizontal seed filling and agitated seed filling can accelerate the seed filling of mechanical seed metering devices, and improve the qualified rate of seed spacing during high-speed practices. In this study, theoretical analysis, discrete element method-based simulation and indoor bench test verification were conducted to investigate how key parameters of the agitated seed metering device with horizontal seed filling (angles, installation position and number of agitating plates, diameters of convex spoons) would affect the characteristics of soybean seed movement, seed number and seeding performance (qualified index, multiple index, missing seeding index) under different working speeds. Computer-based simulation, test design and regression analysis were combined to analyze the population moving rules and optimize the design parameters of seed metering devices. Based on the test scheme as designed, simulations were conducted on Fluent EDEM, and the optimal angle of the agitating plates was determined by analyzing the population migrating rules. Regression equations were established through the regression of test results, and used to find out the optimal design parameters (diameter of convex spoon, positions and number of agitating plates) of seed metering devices. Then the optimal parameter combination among different working conditions was determined that the angle, position and number of agitating plates were 30°, 24.4 mm, and 13, respectively, and the diameter of convex spoon was 11.0 mm. With the optimal parameter combination and at the seeding speed of 12 km/h, the qualified index, multiple index and missing seeding index were 93.1%, 2.1% and 4.8%, respectively. Under high-speed practices, the new seed metering device was not significantly different from the pneumatic seed metering device, but significantly outperformed the mechanical seed metering device.

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Simulation of soya bean flow in mixed-flow dryers using DEM

Cited by 21 publications

References 23 publications

Estudo dos Efeitos das Propriedades Morfológicas Sobre o Escoamento de Grãos de Aveia

Estudo dos Efeitos das Propriedades Morfológicas Sobre o Escoamento de Grãos de Aveia

Modeling of flexible wheat straw by discrete element method and its parameters calibration

Design and key parameter optimization of an agitated soybean seed metering device with horizontal seed filling

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