Measurement of the axial dispersion coefficient of powders in a rotating cylinder: dependence on bulk flow properties

Koynov, Sara; Wang, Yifan; Redere, Agnesa; Amin, Prashani; Emady, Heather; Muzzio, Fernando J.; Glasser, Benjamin J.

doi:10.1016/j.powtec.2016.01.039

Cited by 19 publications

(4 citation statements)

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“…[14] As a result, many characterization techniques have been developed, [15] and efforts have been made to correlate and compare the results obtained in different measurement devices. [16][17][18][19][20] The shear cell methodology, which was originally developed by A. W. Jenike for design of hoppers and silos, [21] is one of the most common powder flow characterization techniques. It has been an engineering practice to classify and rank the flowability of different materials according to the extracted flow function coefficient (ffc).…”

Section: Introductionmentioning

confidence: 99%

A method to analyze shear cell data of powders measured under different initial consolidation stresses

et al. 2016

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Purpose: The shear cell test has been widely used to characterize flow properties of powders and granular materials. The purpose of this study is to address the gap between the extensive usage of the test and the limited methods available to analyze the data, and to introduce methodologies for comparing results for different initial consolidation stresses, materials, and testing devices.Method: A library of shear cell data was established. Forty-one powders were included, and each material was tested under four different initial consolidation stresses. For each initial consolidation stress, 3 sampling replicates were performed. Results: A dimensionless cohesion, C*, was defined as the cohesion divided by the initial consolidation stress. By identifying a correlation between the flow function coefficient (ffc) and C*, the effects of the initial consolidation stress and the testing device were separated. In addition, by identifying a mathematical correlation between the unconfined yield strength and the cohesion, the yield loci from different initial consolidation stresses could be collapsed into a single material characteristic line, enabling one to characterize each material by a single number (the characteristic slope). This approach can be used to economically compare different materials, or different testing devices. Conclusion: The proposed method augments shear cell data analysis and significantly reduces the complexity of the shear cell data.

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Section: Introductionmentioning

confidence: 99%

A method to analyze shear cell data of powders measured under different initial consolidation stresses

et al. 2016

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“…According to their hypothesis, the intensity of light reflected from the surface was proportional to the concentration of the material that changed the color in the sample and that was determined by calculation. 47 The main objective of the applied process is to detect the color hue differences resulting from reinforcement particles. The color change factor, Δ E , is measured by color measurement device and it gives the total chromatic aberration.…”

Section: Methodsmentioning

confidence: 99%

Improved mechanical performance of three-dimensional woven glass/epoxy spacer composites with carbon nanotubes

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2021

Journal of Reinforced Plastics and Composites

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Three-dimensional polymer composites offer various features and design options due to their hollow structure and lightweight. However, to exploit their advantages, it is a must to improve their structural features and mechanical performances including out-plane direction. Although introducing thermoplastic fillers between the plies or multilayered design addresses on this critical issue, the benefits offered by the nanoparticles with superior mechanical properties come a step forward as an another engineering solution. Based on this motivation, the goal of this study is to investigate the impact of multiwalled carbon nanotubes on the mechanical and thermomechanical performances of three-dimensional woven glass/epoxy spacer composites. Therefore, multiwalled carbon nanotubes at various content were introduced into epoxy matrix, and the multiwalled carbon nanotubes–epoxy mixture was infused to three-dimensional woven fabric with the vacuum-assisted resin transfer method. The obtained results indicated that the three-point bending strength and modulus were enhanced up to 25 and 80% for warp direction and enhanced up to 44 and 85% for weft direction with carbon nanotube addition, respectively. Tensile strength developed in the warp direction by 7%, while the strength value in the weft direction did not change. The tensile strain values for warp and weft directions enhanced up to 19 and 12% with carbon nanotube addition, respectively. In addition, thermomechanical analysis has revealed that the glass transition temperature and storage modulus were also improved. Particle dispersion detection with color measurement and scanning electron microscopy analyses revealed the effectiveness of the ultrasonic mixing on the dispersion of carbon nanotubes in the epoxy matrix. The consequences of carbon nanotube addition on microscale morphology were discussed based on the fracture morphologies to nanoscale and microscale toughening mechanisms in the existence of carbon nanotube reinforcement.

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“…Rice threshing process and straw attached to the longitudinal axial threshing cylinder are shown in Figure 5(a). e power status of the threshing cylinder had been investigated many years ago [23].…”

Section: Longitudinal Axial Reshing Cylinder Feeding Powermentioning

confidence: 99%

Design of Negative Pressure Spiral Feeding Device for Tangential and Longitudinal Axial Intersection of Combine Harvester

Tang

Chen

et al. 2019

Advances in Materials Science and Engineering

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A difficult problem occurred with straw clogging at the tangential and longitudinal axial intersection of rice combine harvesters, which seriously affected the efficiency and reliability of the threshing cylinder. The primary objective of this paper was to design a negative pressure spiral feeding device by CFD (computational fluid dynamics). The negative pressure spiral feeding combined structure of the tangential threshing cylinder and longitudinal axial threshing cylinder was established by Pro/E software. Then, the flow path model of the negative pressure spiral feeding device was analyzed by CFD. The airflow velocity distribution of the spiral feed head semicircular cross section and power consumption of the longitudinal axial spiral feeding head were used to verify the effectiveness and rationality of the negative pressure spiral feeding device. The results showed that the two-blade spiral structure and 30 mm pitch shroud structure were more suitable to ensure the smooth flow of straw at the tangential and longitudinal axial intersection. The resistance of the feeding head would cause the power consumption curve fluctuation. The power consumption curve of the improved shroud spiral feed structure was a stable regular fold line without upward trend. When the power consumption curve has an always upward trend, it means that congestion is about to happen. The characteristics of the power consumption curve indicated that the shroud negative pressure spiral feed device designed in this paper was reasonable and effective.

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Measurement of the axial dispersion coefficient of powders in a rotating cylinder: dependence on bulk flow properties

Cited by 19 publications

References 57 publications

A method to analyze shear cell data of powders measured under different initial consolidation stresses

A method to analyze shear cell data of powders measured under different initial consolidation stresses

Improved mechanical performance of three-dimensional woven glass/epoxy spacer composites with carbon nanotubes

Design of Negative Pressure Spiral Feeding Device for Tangential and Longitudinal Axial Intersection of Combine Harvester

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