Airflow resistance of wheat bedding as influenced by the filling method

Łukaszuk, J.; Molenda, M.; Horabik, J.; Szot, B.; Montross, Michael D.

doi:10.17221/8/2008-rae

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…The increase in the static pressure of the gradient with the highest airflows is noted. These results corroborate those obtained in other experiments, such as quinoa (Gratão et al, 2013), peanut pods (Figueiredo et al, 2012), macadamia nut (Biaggioni et al, 2005), canola (Santos et al, 1999), white (Lukaszuk et al, 2008), grains, and cereals in general (ASAE, 2011).…”

Section: Resultssupporting

confidence: 91%

Variation of static pressure in a crambe (Crambe abyssinica Hochst) grains column

BrandÃ£o¹,

Silva²,

Sperotto³

et al. 2016

Afr. J. Agric. Res.

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The crambe has emerged as an option for the production of biodiesel, constituting itself as an alternative for off-season grain in Brazil. To obtain the best performance in the post-harvest product processing, knowledge of physical characteristics of the grains to as well as of the design of machines and structure storage is necessary. After pre-cleaning, the crambe (Crambe abyssinica Hochst) with a water content of 8% (wb) was placed into a silo prototype, provided a fan and plenum, and subjected to five airflow densities that were pre-determined in a total of four repetitions for each tested airflow. The static pressure was measured through the column in five layers. The results show that there is a significant effect of air flow on the static air pressure in the crambe column, which increased linearly with depth. The experimental data fitted with good accuracy the models of Hunter and Shedd, thus enabling their use for the crambe column as well. The objectives of this study were to evaluate the variation of static pressure along a column of grains of crambe that were subjected to five airflow densities and check the fit of this variation following mathematical models suggested by Sheed and Hunter.

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Section: Resultssupporting

confidence: 91%

Variation of static pressure in a crambe (Crambe abyssinica Hochst) grains column

BrandÃ£o¹,

Silva²,

Sperotto³

et al. 2016

Afr. J. Agric. Res.

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show abstract

“…It is necessary to analyze the airflow and temperature distribution of grain piles through experimental studies to optimize the drying equipment to improve the aeration conditions. The factors influencing the airflow distribution and heat transfer efficiency during the fixed bed drying of grain include grain particle size and distribution (Yue & Zhang, 2017a, 2017b), moisture content (Dousthaghi et al, 2022), loading method (Łukaszuk et al, 2008), and particle shape (Łukaszuk et al, 2009). Scholars have developed prediction models for temperature in fixed beds (Dotto et al, 2016) and airflow resistance during aeration (Chelladurai et al, 2015), which are mainly empirical or semi‐empirical.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of flow and heat transfer in a fixed bed of non‐spherical grains using the DEM‐CFD method

Liu

Chen

Zheng

et al. 2023

J Food Process Engineering

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Fixed‐bed drying of grains is a widely used method for determining temperature and humidity changes and pressure drop characteristics during aeration. In this study, an accurate particle‐resolved computational fluid dynamics (CFD) numerical model was developed to investigate the flow and heat transfer in fixed beds of soybean, wheat, and maize grains. A randomly filled non‐spherical grain fixed bed structure was generated using the discrete element method (DEM), and the contact areas between the packed particles are automated. The distribution of grain particles near the wall surface was approximately circular, and the circle became more regular with increase grain sphericity. Compared with the fixed beds of soybean and maize, there was no significant stratification in the fixed beds of wheat, and the difference between the peaks and troughs of porosity oscillations was smaller. Detailed particle‐resolved CFD simulations of the flow and heat transfer in fixed beds with different grains were performed. The results showed that the pressure drop results of the DEM–CFD simulation of different grain shapes were in good agreement with the Nemec–Levec equation and experimental results. The velocity and temperature distribution in the fixed bed have obvious non‐uniform distribution characteristics, which are more visible in the maize pile. Regions with high porosity have a higher average velocity, and the temperature near the wall is higher than that at the center when the heat transfer is unbalanced. The DEM‐CFD model includes the heat conduction process between the fluid and solid phases, which is consistent with the experimental temperature results. Practical Applications In this work, an accurate particle‐resolved computational fluid dynamics numerical model was developed to investigate the flow and heat transfer in fixed beds of soybean, wheat, and maize grains. The randomly filled non‐spherical grain fixed bed structure is generated by the discrete element method (DEM), and the contact areas between the packed particles are automated treated. The pressure drop and heat transfer processes of different grains were measured using the fixed bed drying experimental platform. The results show that the pressure drop results of DEM–CFD simulation of different grain shapes are in good agreement with Nemec–Levec equation results and experimental results. The DEM‐CFD model includes the heat conduction process between fluid and solid phases, which is in close agreement with the experimental temperature results.

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“…For grain aeration technology, it is critical to determine the pressure drop through grain bulk under vertical pressure. Pressure drop in rice [12][13][14], wheat [15,16], soybeans [17], corn [18], rape [19], and other crops has been studied using a variety of variables such as airflow velocity, bed depth, moisture content, filling mode, and theoretical models of pressure drop calculation [20,21].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Pressure Drop Characteristics of Soybean Grain under Vertical Pressure

et al. 2022

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The vertical pressure lead to increased airflow resistance through the grain bulk, which affected the efficiency of ventilation and drying. The effects of vertical pressures at 50, 150, and 250 kPa on the pressure drop characteristics of soybeans were studied using experiment and numerical simulation. The random packing and different compression states for soybean packed beds were generated by the Discrete Element Method (DEM). The Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) were coupled to investigate the radial velocity and pressure drop of soybean bulk. The simulation results showed that the radial porosity had an oscillating distribution, and the radial average dimensionless velocity was consistent with the distribution trend of porosity. The increase in vertical pressure causes a decrease in porosity and an increase in local velocity. The PathFinder code was used as a supplementary method to calculate the pore path and pore characterization parameters, and the resistance coefficient term in the Forchheimer equation was determined. The compression of soybeans measured by the experiment mainly occurred within two hours after loading. The pressure drop of soybeans increased with the vertical pressure, with the average pressure drop at vertical pressures of 50, 150, and 250 kPa being 36%, 57%, and 92% higher than the uncompressed state (0 kPa). The pressure drop of soybeans calculated by the DEM-CFD method and the Forchheimer equation under different vertical pressures were in close agreement with the experimental results, and an average relative difference was found to be less than 10%. These results provide guidance for estimating the pressure drop of soybeans at different grain depths.

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Airflow resistance of wheat bedding as influenced by the filling method

Cited by 18 publications

References 7 publications

Variation of static pressure in a crambe (Crambe abyssinica Hochst) grains column

Variation of static pressure in a crambe (Crambe abyssinica Hochst) grains column

Numerical and experimental investigation of flow and heat transfer in a fixed bed of non‐spherical grains using the DEM‐CFD method

Experimental and Numerical Study of Pressure Drop Characteristics of Soybean Grain under Vertical Pressure

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