Modeling on heat and mass transfer in stored wheat during forced cooling ventilation

Wang, Yuancheng; Duan, Haifeng; Zhang, Hao; Fang, Zhaohong

doi:10.1007/s11630-010-0167-5

Cited by 15 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thirdly, ventilation is another feasible method to limit the fungal growth and reduce the risks caused by high moisture content. 39 It was reported that ventilation can accelerate the air low in storage facilities and hinder the fast growth of fungi and insects. 40 In most cases, the internal circulation ventilation is integrated with the utilization of fumigation as an effective way to kill fungi and insects in the grain bulk.…”

Section: Strategies For the Wheat Seeds Storagementioning

confidence: 99%

Effects of deterioration and mildewing on the quality of wheat seeds with different moisture contents during storage

et al. 2020

View full text Add to dashboard Cite

Deterioration and mildewing caused by moisture of wheat seeds are serious problems that should be addressed for safe storage. In this work, simulated storage facilities were employed to preserve wheat seeds with different moisture contents (16%, 18%, 20% and 22%). The temperature changes in grain bulk, the mildewing situation, and the biochemical properties of wheat seeds were analyzed. Microstructures of endosperm and embryos were observed under electron microscopy. The results showed that with the increase of moisture content in wheat seeds, the deterioration and mildewing became serious. In the storage of wheat seeds with high moisture content, serious damage to the internal structure of endosperm and embryo was observed. Besides, the temperature increase and the fungal growth in grain bulk are attributed to the moisture of wheat seeds. Particularly, with the nutrient loss and cell damage, germination efficiency decreased with the extension of the storage period and the biochemical properties of wheat seeds are negatively impacted. Based on the results of this study, to prevent the deterioration and mildewing of wheat seeds and protect the biochemical properties in long-term storage, moisture should be controlled during the storage.

show abstract

Section: Strategies For the Wheat Seeds Storagementioning

confidence: 99%

Effects of deterioration and mildewing on the quality of wheat seeds with different moisture contents during storage

et al. 2020

View full text Add to dashboard Cite

show abstract

“…where W is the moisture in wheat piles, and ρ t is the density of the grain kernels on a dry basis. The momentum conservation equation was expressed as [34]:…”

Section: Fluid Transport Equationsmentioning

confidence: 99%

“…The energy transfer equation based on the local equilibrium heat model of porous media (air temperature equal to grain temperature) is expressed as [34]:…”

Section: Fluid Transport Equationsmentioning

confidence: 99%

Numerical Study of Low-Temperature Ventilation Drying in a Wheat Grain Silo Considering Non-Uniform Porosity Distribution

Zheng,

Li,

Chen

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The temperature and moisture content inside a grain pile are two important indicators for judging the safety of grain storage. To accurately predict the temperature and moisture content inside a grain pile, a numerical simulation was carried out of the drying process of a mesoscale wheat grain soil based on a thin-layer drying method, considering non-uniform porosity. The effectiveness of this method for wheat piles was verified through a comparison with the experimental data. The influence of different ventilation cage heights and ventilation temperatures on heat and moisture transfer in the wheat grain pile were also studied. The results show the following points. The numerical simulation method in this paper can effectively predict the temperature and moisture content of a wheat grain pile. The non-uniform porosity distribution model can better reproduce the state of ventilation during storage of wheat grain piles than the uniform porosity distribution model. The distribution patterns of flow lines in silos with different ventilation cage heights have certain similarities, but the high-speed airflow area will decrease as the height of the ventilation cage increases. Different ventilation temperatures will significantly affect the areas of high temperature and the rewetting inside a wheat grain pile.

show abstract

“…To better understand and optimize the process of drying, simulation studies of heat and moisture transfer are needed. In recent years, the application of numerical simulation methods to describe heat and mass transfer has been limited to two-dimensional (2D) (Thorpe, 2008;Wang et al, 2010Wang et al, , 2021 and three-dimensional (3D) single-particle models (Ateeque et al, 2014;Montanuci et al, 2014;Prakash et al, 2011;Wu et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Study on heat and moisture transfer of nonspherical rice during hot‐air drying in thin‐layer grain pile

Li,

Yang,

Wang

et al. 2024

J Food Process Engineering

Self Cite

View full text Add to dashboard Cite

To investigate fluid flow and coupled heat‐moisture transfer in the hot‐air drying of grain piles, this study integrated the discrete‐element method with computational fluid dynamics. A model for a thin‐layer grain pile, consisting of nonspherical rice particles represented by 13 spheres, was developed. Using a heat‐moisture transfer model based on fluid–solid coupling, the drying process with hot air was simulated and validated against experimental data. Finally, by controlling the drying temperature and the initial moisture content of rice, the variations in temperature and moisture content during the hot‐air drying process were explored. The numerical results indicated that the nonuniform pore structure within the grain pile, gaps on the surface of nonspherical rice, and the wall effect led to complex airflow patterns, resulting in the formation of dead zones within the grain pile. The oscillation frequency and amplitude of radial porosity near the wall were relatively large, and the minimum porosity occurred at a radial distance of 1/2dg. Heat and moisture transfer rates between the rice and drying air were influenced by the temperature and moisture concentration differences. During the drying process, variations in temperature and moisture content were observed among rice particles. Limited by the moisture diffusion coefficient, there existed a notable disparity in moisture content between the interior and surface of the rice. The results also showed that the curvature of the drying curve in the grain pile varied and was influenced by the drying conditions, especially under the high‐temperature drying condition of 60°C.Practical ApplicationsIn this study, a grain pile model for nonspherical rice particles composed of 13 spheres was developed based on the discrete‐element method and computational fluid dynamics. Furthermore, in accordance with the heat and mass transfer mechanism of fluid–solid coupling, a heat‐moisture transfer model for the hot‐air drying of the grain pile was constructed. This was done to deeply explore the internal fluid dynamic characteristics and the heat‐moisture transfer within the grain pile during the drying process. The newly established model can be widely applied to numerical simulation studies of drying and also has reference value for the design of drying systems.

show abstract

Modeling on heat and mass transfer in stored wheat during forced cooling ventilation

Cited by 15 publications

References 12 publications

Effects of deterioration and mildewing on the quality of wheat seeds with different moisture contents during storage

Effects of deterioration and mildewing on the quality of wheat seeds with different moisture contents during storage

Numerical Study of Low-Temperature Ventilation Drying in a Wheat Grain Silo Considering Non-Uniform Porosity Distribution

Study on heat and moisture transfer of nonspherical rice during hot‐air drying in thin‐layer grain pile

Contact Info

Product

Resources

About