Mathematical Modelling of Airflow and Thermal State in Large Aerated Grain Storage

Khatchatourian, Oleg; Oliveira, F.A. de

doi:10.1016/j.biosystemseng.2006.05.009

Cited by 43 publications

(32 citation statements)

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“…Resistance to airflow is a function of both product and air properties (Khatchatourian and Oliveira, 2006). The air pressure, required to force air through a bed of grain, is dissipated continuously due to friction and turbulence.…”

Section: Introductionmentioning

confidence: 99%

Airflow resistance in soybean

Kenghe¹,

Nimkar²,

Shirkole³

et al. 2012

International Agrophysics

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A b s t r a c t. Resistance of material to airflow is an important factor to consider in the design of a dryer or an aeration system. The airflow resistance of soybean was determined with the modified airflow resistance apparatus. It was found that pressure drop increased with increase in airflow rate, bulk density, bed depth and decreased with moisture content. Modified Shedd equation, Hukill and Ives equation and modified Ergun equation were examined for pressure drop prediction. Airflow resistance was accurately described by modified Shedd equation followed by Hukill and Ives equation and modified Ergun equation. The developed statistical model comprised of airflow rate, moisture content and bulk density could fit pressure drop data reasonably well.K e y w o r d s: airflow resistance, pressure drop, soybean, models INTRODUCTIONThe soybean (Glycine max L.) has been reported to have originated in Eastern Asia. It contains about 20% oil and 40% protein. Soybean protein is rich in the valuable amino acid lycine (5%). A large number of Indian and Western dishes such as bread, chapati, milk, sweets, pastries etc. can be prepared with soybean. Production of soybean in India at present is restricted mainly to Madhya Pradesh, Uttar Pradesh, Maharashtra and Rajasthan. It is also grown on a small acreage in Andhra Pradesh, Karnataka, Nagaland and Gujarat. In India during 2007-08 area, production and yield of soybean is recorded as 8.88 mln ha, 9.99 mln t and 1 124 kg ha -1 , respectively (ISO, 2007).The relationship between a drop in pressure and the rate of airflow through an agricultural product is important in the design of drying or aeration systems. Resistance to airflow is a function of both product and air properties (Khatchatourian and Oliveira, 2006). The air pressure, required to force air through a bed of grain, is dissipated continuously due to friction and turbulence. The pressure drop for airflow through any particulate system depends on the rate and direction of airflow, surface and shape characteristics of the grain, the number, size and configuration of the voids, the particle size range, bulk density, depth of product bed, method of filling bin, fines concentration and moisture content. The data on the airflow-static pressure relationship of a number of agricultural grains have been published (ASABE, 2007). Most of researchers have reported airflow resistance data for agricultural grains but for low ranges of airflow. The data on airflow resistance of agricultural crops are scarce for high airflow range as reported by Nimkar and Khobragade (2006).The phenomenon of pressure drop in airflow through agricultural products has been widely investigated for various grains (Nimkar and Chattopadhyay, 2003;Rajabipour et al., 2001) and root vegetables and other crops (Kashaninejad and Tabil, 2009;Reed et al., 2001;Shahbazi and Rajabipour, 2008;Verboven et al., 2004). In most cases, data were analyzed by means of Shedd (1953) and Hukill and Ives (1955) equations. Both the models have been widely used because they ...

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Section: Introductionmentioning

confidence: 99%

Airflow resistance in soybean

Kenghe¹,

Nimkar²,

Shirkole³

et al. 2012

International Agrophysics

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“…Dry matter loss did not exceed limits that would reduce commercial quality, although seeds could be affected when stored wet and during summer. Khatchatourian et al (2006) developed a mathematical model, an algorithm, and a software for simulating airflow and heat transfer, in aerated soybean storage under nonuniform conditions, to predict seed mass. They adapted this method for a variable section deep bed, tested the method on experimental data, and used it for modeling the thermal state of silos.…”

Section: Storagementioning

confidence: 99%

Trends in Recent Studies on Post-Harvest Technology

Natsuga

2015

Journal of Biosystems Engineering

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Purpose: This article summarizes the trends in recent research publications in relation to post-harvest technology for drying, storage, and quality, between 2005 and 2015. Methods: As of September 7, 2015, a search query using two keywords, drying and agriculture, on the Web of Science (Registered trademark of Thomson Reuters) resulted in 3749 articles that were published between 2005 and 2015. However, the review was restricted to research articles published in the journals Transactions of the ASABE (American Society of Agricultural and Biological Engineers) and Biosystems Engineering: Journal of European Agricultural Engineering. Results: The total number of articles in the two journals related to drying, storage, and quality was 500, 319, and 885, respectively. The number of articles related to drying, storage, and quality was 250, 177, and 250, respectively, in Transactions of the ASABE. The number of articles related to drying, storage, and quality was 250, 142, and 283, respectively, in Biosystems Engineering. Conclusions: A shift in research focus from drying and storage to quality in Transactions of the ASABE might reflect a shift toward quality-conscious consumers. It seems that ASABE members are more focused on articles related to post-harvest technologies on quality than their European counterparts. Articles were cited based on their abstract content. Readers should read the full articles for more details.

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“…No trabalho de Khatchatourian & Oliveira [7] foi mostrado que, para as condições de resfriamento de grãos por aeração, o número de Bioté pequeno (Bi < 0.2), que justifica o uso de um coeficiente de difusividade térmica efetivo para a camada de grãos. Mesmo assim, para evitar a necessidade de levar em conta a variação significativa deste coeficiente durante o processo de resfriamento conforme a seção considerada, foram propostos alguns modelos matemáticos que não utilizam este coeficiente e que apresentaram boa concordância com os dados experimentais.…”

Section: Modelo Matemáticounclassified

“…Vários autores tentaram descrever a dinâmica de variação de temperatura da massa de grãos. Alguns deles, como por exemplo, Bakker-Arkema & Bickert [1], Khatchatourian et al [6], Khatchatourian & Oliveira [8], admitiram que, para o caso da aeração de grãos, o fenômeno de transferência de massa deágua pode ser desprezado. Outros autores, como Hunter [4], Sanderson et al [11], White [13], levaram em conta nos modelos matemáticos a existência de transferência de calor e de massa nas camadas de grãos.…”

Section: Introductionunclassified

Modelagem Matemática do Resfriamento de Massa de Grãos Armazenados em Silos com Aeração

Oliveira¹,

Khatchatourian²,

Bihain³

2007

TEMA - Tendências Em Matemática Aplicada E Computacional

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Resumo.Neste artigo, foi realizado um estudo teórico-experimental sobre o estado térmico de uma massa de grãos de soja armazenada em silos sujeita a aeração. Para simular a dinâmica de resfriamento foi proposto um modelo matemático, que se apresenta como um caso intermediário entre o problema de estado térmico de um corpo constituído por dois materiais diferentes (com fronteira fixa) e o problema de Stefan, onde a fronteira móvel separa os domínios de fases diferentes. Foi obtida a solução analítica deste problema e feita a identificação do modelo proposto pelos dados experimentais. Realizou-se a comparação das simulações deste modelo com os dados experimentais e com outros três modelos matemáticos já conhecidos na literatura.Foi mostrado que o modelo proposto neste trabalho, descreve razoavelmente o processo de resfriamento.

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Mathematical Modelling of Airflow and Thermal State in Large Aerated Grain Storage

Cited by 43 publications

References 20 publications

Airflow resistance in soybean

Airflow resistance in soybean

Trends in Recent Studies on Post-Harvest Technology

Modelagem Matemática do Resfriamento de Massa de Grãos Armazenados em Silos com Aeração

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