Simulation Model of Two-Dimensional Heat Transfer in Controlled-Atmosphere Grain Bins

Muir, W. E.; Fraser, Bruce; Sinha, R. N.

doi:10.1016/b978-0-444-41939-2.50040-1

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…Total solar radiation (beam plus diffuse) on a horizontal surface can be recorded using a pyranometer. Sky radiation was estimated using a procedure from Maier (1992), and the earth to roof radiation was estimated according to Muir et al (1980). Reradiation values from ASHRAE (1985) were used.…”

Section: Boundary Conditions During Non-aerated Storage Solar Radiatimentioning

confidence: 99%

Development of a Finiteelement Stored Grain Ecosystem Model

Montross¹,

Maier²,

Haghighi³

2002

Transactions of the ASAE

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An axisymmetric finite-element model was developed that predicts the heat, mass, and momentum transfer that occurred in upright corrugated steel storage structures due to conduction, diffusion, and natural convection using realistic boundary conditions. Weather data that included hourly total solar radiation, wind speed, ambient temperature, and relative humidity were used to model the temperature, moisture content, dry matter loss, and maize weevil development during storage with no aeration, and with ambient and chilled aeration. Periods of aeration were simulated assuming a uniform airflow rate through the grain mass. Heat and mass balances were used to calculate the temperature and absolute humidity in the headspace and plenum based on solar radiation, wind speed, ambient conditions, air infiltration, convective heat and mass transfer from the grain surface, and permeable boundaries that allowed natural convection currents to cross grain surfaces. A heat balance was used to estimate the wall temperature. The type of weather data in terms of solar radiation and frequency of data appear to be important when predicting the grain temperature, moisture content, dry matter loss, and maize weevil development.

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Section: Boundary Conditions During Non-aerated Storage Solar Radiatimentioning

confidence: 99%

Development of a Finiteelement Stored Grain Ecosystem Model

Montross¹,

Maier²,

Haghighi³

2002

Transactions of the ASAE

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“…The process of heat and mass transfer was mathematically simulated solving set of equations using the finite difference method. Numerical method using finite differences could be used to simulate temperature in a grain bin with fewer limitations than analytical methods (Muir et al, 1980). The accuracy of the finite difference method approaches that of the analytical solution when suitable time and space increments are chosen (Yaciuk et al, 1975).…”

Section: Introductionmentioning

confidence: 99%

Rice grain cooling using intermittent adsorption and desorption of water vapour: development of a mathematical model

Kariyawasam¹,

Amaratunga²,

Basnayake³

et al. 2015

Trop. Agric. Res.

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A one-dimensional heat and mass transfer model was developed for predicting grain temperature in a deep bed of paddy exposed to intermittent adsorption and desorption cycles and the numerical solutions of the model were approached by finite difference method. The inlet temperature and relative humidity of air were used as the model inputs. The model was validated using a laboratory scale experimental setup. The data were collected by forced air ventilation with moist air following intermittent adsorption and desorption cycles of 5 and 10 min in a 0.15 m bed of paddy in a 0.11 m diameter circular bin. The measured and predicted grain temperatures at different layers were in close agreement over the test period with an accuracy of ± 0.5 °C. Thus, the mathematical model developed can be used in predicting the rice grain temperature with similar applications.

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“…Different mathematical models with one or two dimensional heat and mass transfer equations were used to predict real time temperature, moisture content etc. in various food products (Muir, et al, 1980 andMurata et al, 1996). The numerical solutions of these models can be obtained by finite difference method (Yacink et al, 1975).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Trough Withering of Tea using One Dimensional Heat and Mass Transfer Finite Difference Model

2011

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One-dimensional heat and mass transfer mathematical model was developed to simulate moisture content of tea leaves during trough withering. Model solutions were approached using finite difference method with appropriate boundary conditions. A computer program written in QBASIC was used to calculate the real time moisture content of tea leaves and other psychometric parameters of conditioned air during withering. Four experiments were performed using commercial type of withering trough to validate the developed model. Leaf samples were drawn from top, middle and bottom layers of the leaf bed in the trough for one-hour time interval for 12 h of the test period. Simulated moisture data calculated by the program was compared with the experimental data. Time and space increments of the model were chosen minimizing the estimation error of moisture content. Results showed that the experimental and simulated moisture data were in close agreement for top, middle and bottom layers of the withering trough with standard errors in the range

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Simulation Model of Two-Dimensional Heat Transfer in Controlled-Atmosphere Grain Bins

Cited by 18 publications

References 7 publications

Development of a Finiteelement Stored Grain Ecosystem Model

Development of a Finiteelement Stored Grain Ecosystem Model

Rice grain cooling using intermittent adsorption and desorption of water vapour: development of a mathematical model

Simulation of Trough Withering of Tea using One Dimensional Heat and Mass Transfer Finite Difference Model

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Simulation Model of Two-Dimensional Heat Transfer in Controlled-Atmosphere Grain Bins

Cited by 18 publications

References 7 publications

Development of a Finiteelement Stored Grain Ecosystem Model

Development of a Finiteelement Stored Grain Ecosystem Model

Rice grain cooling using intermittent adsorption and desorption of water vapour: development of a mathematical model

Simulation of Trough Withering of Tea using One Dimensional Heat and Mass Transfer Finite Difference Model

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Product

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Development of a Finiteelement Stored Grain Ecosystem Model

Development of a Finiteelement Stored Grain Ecosystem Model