A novel model of pressure drop for airflow penetrating randomly packed cylindrical particles

Zhang, Chengquan; Xia, Yunfei; Gao, Jun; Xu, Yukun; Xie, Wuhao; Yu, Yanlei; Zeng, Lingjie; Gao, Y.-B.

doi:10.1016/j.powtec.2022.117727

Cited by 5 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PRCFD can directly obtain the pressure drop of the bed, with an average error of less than 8% compared to the experiment. The PRCFD considers several factors, including particle shape, wall effects, internal friction, and the sudden expansion and contraction of the flow channel during fluid flow, which resulted in more accurate pressure drop outcomes (Rezvani et al, 2015; Zhang, Xia, et al, 2022; Zhang, Zhang, et al, 2022). The HCM underestimated the pressure drop at higher inlet velocities, resulting in an average deviation of 21% from the experimental values.…”

Section: Resultsmentioning

confidence: 99%

“…The grain bin was equipped with a centrifugal fan and a dedicated air accurate pressure drop outcomes (Rezvani et al, 2015;Zhang, Xia, et al, 2022;. The HCM underestimated the pressure drop at higher inlet velocities, resulting in an average deviation of 21% from the experimental values.…”

Section: Pilot-scale Validation Systemmentioning

confidence: 99%

“…In the 1990s, researchers studying airflow distribution in grain storage piles focused on computational efficiency by treating the piles as homogeneous continuous media. They accomplished this by modifying the granary structure, inlet duct configurations, inlet velocity conditions, and grain packing forms (Alagusundaram et al, 1990; Kashaninejad et al, 2010; Khatchatourian & De Oliveira, 2006; Nawi et al, 2010; Zhang, Xia, et al, 2022; Zhang, Zhang, et al, 2022). Although the particle‐resolved computational fluid dynamics (PRCFD) method, which restores the packing structure and porosity distribution of particles in a fixed bed, and solves the heat and mass transfer inside particles, was available, its high computational cost made it unsuitable for large‐scale practical production (Ambaw et al, 2017; Liu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

Liu

Chen

Zheng

et al. 2023

J Food Process Engineering

View full text Add to dashboard Cite

To investigate the influence of pore structure distribution on the flow and heat transfer during the aeration process of a grain pile, an anisotropic continuous model (ACM) was developed based on the homogeneous continuous model (HCM). The improved ACM includes spatial resistance factors and effective thermal conductivity correction coefficients. The experimental results were compared with the particle‐resolved computational fluid dynamics (PRCFD) and ACM simulation results to verify the accuracy. At higher inlet velocities, the HCM underestimated the pressure drop in the wheat fixed bed, with an average deviation of 21%. In contrast, the improved ACM incorporates the effect of resistance factors and had an average deviation of less than 10% from the experimental. By simulating the pilot‐scale bin aeration system, the accuracy of the improved ACM applied to the real bin was ensured, considering the change in the porosity of the grain pile along the center of the bin to the bin wall and the grain pile height direction. The range of variable porosity distribution was set at .35–.45, and the total average deviation between the ACM simulation static pressure and the experimental value was 9.7% when the inlet airflow velocity was .019 m/s. The simulated temperature of the ACM matches the measured temperature better compared to the temperature values of the grain pile at different heights in the HCM with a constant porosity of .45. Therefore, the impact of four central air collection duct forms on airflow and temperature was discussed, and it was determined that the pipe with a larger diameter at the top and a smaller diameter at the bottom air collection duct was more advantageous when used in a horizontal aeration system by applying the improved ACM to different scenarios.Practical ApplicationsThis study introduces the resistance factor and effective thermal conductivity in a laboratory‐scale fixed bed of wheat. An improved anisotropic continuous model was established for simulating the flow and heat transfer in the fixed bed during the aeration process. The improved anisotropic continuous model accurately reflected the non‐uniformity of fixed bed flow and temperature transfer in the fixed bed. This model can be employed for simulating flow and heat transfer in large‐scale actual storage systems characterized by heterogeneous pore distribution, while ensuring appropriate computational efficiency and precision.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Pilot-scale Validation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

Liu

Chen

Zheng

et al. 2023

J Food Process Engineering

View full text Add to dashboard Cite

show abstract

“…7,8 Extensive experimental research and hydrodynamic models have been proposed to guide the design of superior packings. 3,9 For example, Billet et al proposed correlation models for estimating the pressure drop and liquid holdup in vertical pipe flow by considering the balance of liquid microelement gravity and friction force on the surface of packing 10 ; Delft et al developed hydrodynamic models by examining liquid film flow on the surface of inclined wavy plates, categorizing hydrodynamic performance into gas-liquid interactions, gasgas interactions, and alterations in airflow direction 11,12 ; SRP models establish the connection between hydrodynamic performance and mass transfer performance by predicting the pressure drop, liquid holdup, and effective interface area. 13,14 These experimental results and models have been widely applied in developing packings, designing columns, and simulating processes (i.e., Aspen, Fluent, and computational fluid dynamic).…”

mentioning

confidence: 99%

New insight and experimental study of ineffective void in hydrodynamic performance of countercurrent‐flow packing column

Xu,

Gao,

Gao

et al. 2024

AIChE Journal

View full text Add to dashboard Cite

Extensive experimental research and hydrodynamic models have been proposed to guide the design of superior packings. However, most research has concentrated on the effective void (ε − H) of packing while ignoring the ineffective void (ε − H − HL), which causes discrepancies in hydrodynamic performance compared to actual observations. This study evaluated the hydrodynamic performance under diverse conditions considering the liquid holdup (H), pressure drop (ΔP), and gas flooding velocity (uf). A novel approach to hydrodynamic model construction is introduced by incorporating an ineffective void. The results indicate that at a constant hold‐up area, liquid flow (L) and viscosity (μ) significantly influence liquid hold up, moderated by the gas velocity in the flooding area. The pressure drop rises as the viscosity, gas flow rate, and liquid flow rate increase. Notably, a considerable pressure drop initiates flooding at the bottom of the absorber. Elevated liquid flow rates and viscosities correlate with higher ineffective void values (HL) in the packing column. At low gas flow rates, the gas flow rate marginally affects HL values. However, after the flooding point was achieved, the values of HL rapidly increased as the gas flow rate increased. Moreover, a linear relationship emerges between the liquid holdup and HL, as evidenced by the consistent variation in the liquid holdup and the F‐factor. Utilizing the ineffective void yields a more accurate fit for the experimental data, reducing the average absolute relative deviation to 10.2%, 7.4%, and 10.8%, respectively.

show abstract

Study on the dynamics of slip and detachment of thin de-icing fluid films on wing surfaces

Cui,

Chang,

Xing

et al. 2024

Meccanica

View full text Add to dashboard Cite

A novel model of pressure drop for airflow penetrating randomly packed cylindrical particles

Cited by 5 publications

References 34 publications

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

An improved anisotropic continuum model for the flow and heat transfer in grain aeration system

New insight and experimental study of ineffective void in hydrodynamic performance of countercurrent‐flow packing column

Study on the dynamics of slip and detachment of thin de-icing fluid films on wing surfaces

Contact Info

Product

Resources

About