An experimental and theoretical study on particles-in-air behavior characterization at different particles loading and turbulence modulation

Kabeel, A.E.; Elkelawy, Medhat; Bastawissi, Hagar Alm‐Eldin; Elbanna, Ahmed Mohammed

doi:10.1016/j.aej.2019.04.002

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…Consequently, following the completion of the primary filling process, the seed orientation within the effective filling area undergoes adjustment to a singular reclined posture through variable-diameter and airflow-guided positioning. The seeds at the hole were positioned through the pressure generated by turbulence resistance ( Kabeel et al., 2019 ). So, a through-hole is incorporated at the bottom of the hole insert to achieve airflow guidance and precise positioning.…”

Section: Methodsmentioning

confidence: 99%

Development of a new environmentally friendly and efficient centrifugal variable diameter metering device

Zhang,

Zhao,

Gao

et al. 2024

Front. Plant Sci.

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IntroductionThe design of the maize metering device involves centrifugal variable diameter pneumatic and cleaning mechanisms, aiming to enhance the performance and power efficiency of pneumatic maize metering devices. Leveraging the impact of changes in centrifugal diameter and the guidance and positioning of airflow, we optimize the hole insert, seeding plate, seed limit board, and integrated front shell. This optimization facilitates the adjustment of both the quantity and posture of seed filling. As a result, seeds can form a uniform flow within the annular cavity, reducing the wind pressure necessary for regular operation and decreasing power consumption.MethodsA quadratic regression orthogonal rotation combination experiment is conducted using a self-made experiment bench, considering ground speed, wind pressure, and seeding rate as the experiment factors. Furthermore, a comparative experiment involving a novel centrifugal variable-diameter type metering device.ResultsThe results indicate optimal seeding performance when the ground speed is 13.2 km/h, the wind pressure is 1.2 kPa, and the feeding rate is 25 seeds/s. Under these conditions, the quality of feed index reaches 95.20%, the multi-index is 3.87%, and the miss index is 0.93%. Findings reveal that the developed seed metering device achieved a quality of feed index exceeding 93.00% across varying speeds of 12~18 km/h, aligning with the production requirements. Moreover, the actual power consumption of Type B and C is about 85.00% and 98.00% lower than Type A, standing at only 32.90 W at 18 km/h. The COP of Type C is about 86 times and 12 times that of Type A and B, respectively, meeting the demands for efficient production of maize seed metering devices.DiscussionIn comparison to traditional design and structural parameter optimization methods for maize seed metering device, this study is helpful to the sustainable development of maize industry and reduce environmental pollution.

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Section: Methodsmentioning

confidence: 99%

Development of a new environmentally friendly and efficient centrifugal variable diameter metering device

Zhang,

Zhao,

Gao

et al. 2024

Front. Plant Sci.

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“…Ignition" (PCCI), Reactivity Controlled Compression Ignition (RCCI) and Stratified Charge Compression Ignition (SCCI) [39][40][41][42]. HCCI combustion strategy combines both CI and spark ignition (SI) which provides a homogeneous A/F mixture like SI that auto ignited due to compression like CI [43,44].…”

Section: Ltc Technology Includes Various Modes Like Homogeneous Charg...mentioning

confidence: 99%

Experimental Investigation of the Biodiesel Direct Injection and Diesel Fuel as Premixed Charge on CI-Engine Emissions, Performance, and Combustion Characteristics

Elkelawy

Bastawissi²,

elhamid³

et al. 2023

Journal of Engineering Research

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This study aims to investigate the use of waste cooking oil biodiesel blend (B30D70) in CDC mode and the use of different premixing ratios of diesel vapor (15%, 20%, 25% and 30%) through manifold injection at a manifold premixed temperature of 110 ⁰ C in PCCI mode when using biodiesel blend (B30D70) as the main fuel and diesel as the premixed fuel. The experiments were carried out on 4-stroke, single-cylinder, air cooled, DI diesel engine which was modified to run in PCCI mode with adding a fuel vaporizer to create the external homogeneous mixture. The engine combustion parameters, performance, and emissions characteristics were fully discussed, and the results were compared with these of CDC mode fueled by diesel. The obtained results for the use of B30D70 fuel indicates a certain decrement for exhaust gas temperature, HC, and CO emissions, but with a penalty in brake thermal efficiency, NOx, and smoke opacity. The experiments revealed that the best results were indicated for 20% diesel vapor in PCCI mode as CO, HC, NOx, and EGT reduced by 34.62%, 43.75%, 2.65% and 8.53% respectively and almost has the same BTE compared to CDC mode fueled by diesel. While increasing PR to 25% and 30% decrease the volumetric efficiency leads to rich mixture and deterioration of combustion and increase CO, HC and smoke emissions.

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Experimental and numerical study of free-falling streams of particles impacting an inclined surface

Dodds

Sarhan

Naser

2023

Exp. Comput. Multiph. Flow

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This paper presents a detailed experimental and numerical analysis of free-falling particle streams impacting a 45° inclined surface of differing materials. The particles used in this study were glass spheres with average diameters of 136 and 342 µm and a density of 2500 kg/m3. The three mass flow rates considered are 50, 150, and 250 grams per minute (gpm). The effect of wall material on the collision process was also analysed. Special attention was paid to the influence of wall roughness. Therefore, a plate of stainless steel with polished surface, an aluminium sheet, and a Perspex plate with similar properties to those of the rest of the wall sections were used. The experimental data were used to improve and validate a wall collision model in the frame of the Lagrangian approach. A new drag force formula that includes the effects of particle concentration as well as particle Reynolds number was implemented into commercially available codes from CFX4-4 package. It was found that the improved CFD model better predicted the experimental measurements for the particle rebound properties. The rough-wall model in these results showed greater effect on smaller particles than on larger particles. The results also showed that the improved CFD model predicted the velocity changes slightly better than the standard model, and this was confirmed by both the quantitative velocity comparisons and the qualitative concentration plots. Finally, the inclusion of the particle-particle collision was shown to be the dominant factor in providing the dispersion of the particles post collision. Without a sufficient particle-particle collision model, the standard model showed all particles behaving virtually identical, with the main particle stream continuing after the collision process.

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An experimental and theoretical study on particles-in-air behavior characterization at different particles loading and turbulence modulation

Cited by 7 publications

References 29 publications

Development of a new environmentally friendly and efficient centrifugal variable diameter metering device

Development of a new environmentally friendly and efficient centrifugal variable diameter metering device

Experimental Investigation of the Biodiesel Direct Injection and Diesel Fuel as Premixed Charge on CI-Engine Emissions, Performance, and Combustion Characteristics

Experimental and numerical study of free-falling streams of particles impacting an inclined surface

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