Simulation of Coupled Heat and Mass Transfer in Granular Porous Media: Application to the Drying of Wheat

Hemis, Mohamed; Singh, Chandra B.; Jayas, Digvir S.; Bettahar, A.

doi:10.1080/07373937.2011.591712

Cited by 25 publications

(15 citation statements)

References 15 publications

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“…(2) All particles of WG have the same MC. (3) Volume shrinkage of WG is negligible during drying [22,23]. (4) Horizontal variation of air temperature and humidity in the FBD are negligible [22,23].…”

Section: Governing Equations and Assumptionsmentioning

confidence: 99%

“…Thin-layer drying models for drying behaviors of biological products can be classified into three different types, namely, theoretical, semi-theoretical, and empirical models [26][27][28]. The theoretical type is generally derived from the Fick's second law of diffusion with Arrhenius-type temperature dependent diffusivity or simultaneous heat and mass transfer equations [22][23][24][25]29]. The semi-theoretical type concerns the approximated theoretical equations, which is valid for the temperature, relative humidity, air velocity, and MC [29].…”

Section: Introductionmentioning

confidence: 99%

“…It provides helpful information between the macro fluid (air bubbles) and the micro fluid (suspended particles). The mass transfer equations for the thin-layer drying approach were used to calculate the MC of grain [22][23][24][25][26][27][28][29][30]. Thin-layer drying models for drying behaviors of biological products can be classified into three different types, namely, theoretical, semi-theoretical, and empirical models [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Modelling Condensation and Simulation for Wheat Germ Drying in Fluidized Bed Dryer

Chan

Kuo

2018

Processes

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Abstract:A low-temperature drying with fluidized bed dryer (FBD) for wheat germ (WG) stabilization could prevent the loss of nutrients during processing. However, both evaporation and condensation behaviors occurred in sequence during FBD drying of WG. The objective of this study was to develop a theoretical thin-layer model coupling with the macro-heat transfer model and the bubble model for simulating both the dehydration and condensation behaviors of WG during low-temperature drying in the FBD. The experimental data were also collected for the model modification. Changes in the moisture content of WG, the air temperature of FBD chamber, and the temperature of WG during drying with different heating approaches were significantly different. The thermal input of WG drying with short heating time approach was one-third of that of WG drying with a traditional heating approach. The mathematical model developed in this study could predict the changes of the moisture content of WG and provide a good understanding of the condensation phenomena of WG during FBD drying.

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Section: Governing Equations and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling Condensation and Simulation for Wheat Germ Drying in Fluidized Bed Dryer

Chan

Kuo

2018

Processes

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“…For modeling the unsteady deep-bed drying of grain, different approaches have been developed such as the one-dimensional model of Sun and Woods [7] and the 2D model of Sitompul et al [8]. More recently, deep-bed drying models have also been published by Bathiebo et al [9] and Hemis et al [10]. These transient models were successfully applied to predict fixed-bed ventilation drying of grain, but often formed the basis for continuous drying models as well.…”

Section: Introductionmentioning

confidence: 99%

“…Tracer gas concentration (CO 2 ) measured at the outlet air ducts No 10,11,12. and 13 for diagonal arrangement.…”

mentioning

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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Heat consumption and modeling of corn seeds intermittent drying

Raimundini Aranha,

Lopes Ferrari,

Paschoal

et al. 2023

JSFA Reports

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BACKGROUNDCorn seed is produced on a large scale, and as production is carried out seasonally, the storage is needed to supply uninterrupted demand. To carry out the storage, as the material from the harvest has a high initial moisture content, it is necessary to carry out the drying process. In order to reduce energy consumption, an alternative is intermittent drying. The purpose of this article is to fit mathematical model of intermittent drying by distributed parameters, based on experimental data of temperature and moisture content of corn seeds submitted to intermittent drying, to determine the diffusivity value and to assess heat consumption.RESULTSFor samples dried to the final moisture content of 16.0 % in dry basis (d.b.), the condition of intermittent drying at a temperature of 40 °C and 10 minutes of tempering period led to the lowest heat consumption, in comparison to conventional drying and to intermittent drying under higher temperatures. In addition, to obtain a final moisture content of 14.0 % (d.b.), the conventional drying condition at 55 °C resulted in the lowest heat consumption, compared to the other drying conditions. The distributed parameter model can predict the experimental data with a global deviation lower than 10.0 %CONCLUSIONAnalyzing the moisture distribution profiles for the corn seeds, it was verified that there was a difference in the moisture content along the position inside the material, being necessary to evaluate the influence of moisture distribution along the position inside the material in kinetic drying models.This article is protected by copyright. All rights reserved.

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Simulation of Coupled Heat and Mass Transfer in Granular Porous Media: Application to the Drying of Wheat

Cited by 25 publications

References 15 publications

Modelling Condensation and Simulation for Wheat Germ Drying in Fluidized Bed Dryer

Modelling Condensation and Simulation for Wheat Germ Drying in Fluidized Bed Dryer

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

Heat consumption and modeling of corn seeds intermittent drying

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