Modelling and simulation of cross flow grain dryers

Khatchatourian, Oleg; Vielmo, Horácio A.; Bortolaia, Luís Antônio

doi:10.1016/j.biosystemseng.2013.09.001

Cited by 23 publications

(14 citation statements)

References 27 publications

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“…In the paper published by Khatchatourian, Vielmo and Bortolaia [5], the researchers conclude they could evaluate the non-uniformity of temperature and grain moisture content distributions in dryers, the length of drying process and the energy efficiency for each geometry and control regime.…”

Section: Results Of Studied Modelsmentioning

confidence: 99%

“…, ρ a is the density of dry air (kg.m −3 ) and ρ p is the density of product (kg.m −3 ). In [5], the mass and heat transfer processes during the drying of soya beans in a continuous cross-flow dryer with three drying stages and cooling chamber were described by a system of four order non-linear partial differential equations. The system is shown below:…”

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confidence: 99%

“…Air temperature significantly affects the mass transfer process, whereas air velocity poses almost no effect, and a low velocity lessens energy consumption. Rice Vertical Silo [5] Soya Beans Cross Flow Grain Dryers [6] Paddy Columnar Dryer [7] Brown Rice Shallow Depth Forced-Air [8] Generic Grains Mixed-Flow Dryer [9] Corn and Rice Mixed-Flow Dryer [10] Corn Not specified…”

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confidence: 99%

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A Survey on Heat Transfer in the Aerated Drying Process of Stored Grains

Petravicius¹,

Moraes²,

Souza³

et al. 2020

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

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The purpose of this review is to investigate and analyze recent publications on experimental studies on mathematical models that evaluate, or suggest that such a method can be evaluated, the drying process of stored grains by aeration and how the heat transfer occurs in this process. The emphasis for this paper is on the observation of types of grains ordinarily usually used in the experimental studies, on the mathematical techniques that define the models and on the efficiency observed for these studied models. Finally, it is expected to present a paper with a synthesis consistent with the current reality that might direct subsequent research on the area of heat transfer on stored grains drying by aeration.

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Section: Results Of Studied Modelsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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A Survey on Heat Transfer in the Aerated Drying Process of Stored Grains

Petravicius¹,

Moraes²,

Souza³

et al. 2020

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics

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“…The model can be applied to construct effective drying processes. A mathematical model for cross flow grain dryers was developed by Khatchatourian et al [15] to simulate the dryer performance with and without air recirculation. Different dryer outlines were investigated with a variable number of airflow stages considering co-current and counter-current flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the airflow distribution in mixed-flow grain dryers

et al. 2015

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The aim of this study was to investigate the airflow distribution in the mixed-flow dryer (MFD) and to study the effect of different bed materials and air duct arrangements. The results were used to validate the numerical model developed in a previous work based on the Computational Fluid Dynamics (CFD). A series of experiments have been conducted at a semi-technical MFD test dryer with horizontal and diagonal air duct arrangement.Wheat and rapeseed were used as bed materials. The experiments were performed under isothermal conditions. Two experimental methods were selected and adapted to the measuring problem -the measurement of the isobar distribution within the grain bed and the residence time analysis using the tracer gas pulse method.As could be shown, the isobar distributions measured for wheat and rapeseed agreed well with the model predictions. The numerical model could well calculate the influence of the bed material with its different particle characteristics (e.g. particle shape, particle size, bed porosity). The results obtained from the residence time analysis confirmed the known quartering of the air stream flowing from one inlet air duct to the four surrounding outlet Downloaded by [New York University] at 20:13 22 July 20152 air ducts for the horizontal air duct arrangement. Whereas, in the diagonal air duct arrangement, the air steam from one inlet air duct was nearly halved flowing to the two adjacent diagonal outlet air ducts. These results were confirmed by investigations of the air velocity distribution within the grain bulk. Further experiments are necessary to refine the model. For it, the residence time and isobar measurements will be extended to study the influence of different air properties under real drying conditions, the effect of structural elements and dryer designs.

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“…Both natural and artificial drying involve interaction between the product and the environment via heat and mass transfer. Transfer intensity and gradient formation can qualitatively alter the final product, depending on the drying conditions used (Nádvorníková et al, 2018;Defendi et al, 2016;Khatchatourian et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Drying process: effects of temperature on the oil of different sunflower genotypes

Wenneck

Saath

Rezende

et al. 2020

Idesia

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Drying is a critical stage in postharvest grain processing and alters its structural and physiological characteristics, affecting the quality of the final product. This study aimed to assess the effect of drying sunflower achenes on oil content. A randomized block design was used, in a 5 x 4 factorial scheme consisting of four drying treatments (35, 40, 50 and 70 ºC) in a forced-air dryer and one under uncontrolled conditions (drying terrace), with four repetitions. Oil content and acid value were analyzed in oil extracted from the achenes of 13 sunflower genotypes grown under the same conditions, whose moisture content declined from 30 to 8 % (dry basic) under different drying temperatures. Data were analyzed using the Scott-Knott test (p < 0.05). Drying under controlled conditions at high temperatures (50 and 70 ºC) reduced the achene oil content for all the genotypes assessed, with an acid value close to (50 ºC) or above (70 ºC) the maximum legal limit. Uncontrolled drying and controlled low temperatures (35 and 40 ºC) showed no significant variations in oil content or acid value.

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Modelling and simulation of cross flow grain dryers

Cited by 23 publications

References 27 publications

A Survey on Heat Transfer in the Aerated Drying Process of Stored Grains

A Survey on Heat Transfer in the Aerated Drying Process of Stored Grains

Experimental and numerical study of the airflow distribution in mixed-flow grain dryers

Drying process: effects of temperature on the oil of different sunflower genotypes

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