Granular segregation in quasi-2d rectangular bin

Gharat, Sandip H.; Khakhar, D. V.

doi:10.1063/1.4812041

Cited by 4 publications

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“…Heap is formed when we poured materials on fixed bead of granular materials. Surface flow and segregation is very common during heap formation [29,30,31,32]. Fig.…”

Section: Heap Flowmentioning

confidence: 99%

A review on flow and segregation of granular materials during heap formation

Sardare,

Gharat

2024

J. Phys.: Conf. Ser.

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Segregation is an important process mainly used in industries during the flow of granular materials. A granular medium is repeatedly collected particles that have different properties like size, shape, and density. Heap formation in the industry occurs if particles with various sizes, forms, material densities or surface properties are made of bulk materials, then they spatially separate during formation of the heap. This paper provides a detailed understanding of segregation dynamics in granular flows within industrial processes. Focusing on the intricate interplay of particle characteristics, mixing phenomena, and heap formation methodology, the review delves into the essential aspects influencing the spatial separation of particles. Granular media, comprising particles with distinct properties such as size, shape, and density, undergo segregation during the flow processes commonly employed in industries. The formation of heaps becomes a consequential outcome when bulk materials consist of particles exhibiting variations in size, shape, material density, or surface properties. The comprehensive analysis within this review encompasses detailed insights into granular material flow, the intricacies of mixing, the mechanisms of segregation, and the profound effects of particle characteristics on these processes. Additionally, the paper scrutinizes various methodologies employed in industrial settings for heap formation, providing a holistic perspective on the key factors influencing segregation dynamics in granular flows. This review aims to contribute valuable insights to researchers, engineers, and practitioners involved in the optimization and control of granular material handling within diverse industrial applications.

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“…Heap is formed when we poured materials on fixed bead of granular materials. Surface flow and segregation is very common during heap formation [29,30,31,32]. Fig.…”

Section: Heap Flowmentioning

confidence: 99%

A review on flow and segregation of granular materials during heap formation

Sardare,

Gharat

2024

J. Phys.: Conf. Ser.

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“…For size segregation in dense, sheared granular flows, a widely accepted percolation-based mechanism (sometimes called kinetic sieving [10]) posits that voids between particles are generated by shear and smaller particles are more likely than larger particles to fall into the voids under gravity. Consequently, large particles are pushed upward to the free surface, resulting in segregation in various flow geometries such as bounded heaps [14,15,16], rotating tumblers [17,18], and chutes [19,20]. Most of these studies have focused on segregation in steady granular flows with relatively simple kinematics and time invariant pattern formation.…”

Section: Introductionmentioning

confidence: 99%

Controlling granular segregation using modulated flow

et al. 2017

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Unsteady flows of granular media are ubiquitous yet remain largely unexplored. In this research, we apply unsteady flows to strongly segregating granular materials to control the segregation pattern and enhance overall mixing. Sizebidisperse granular mixtures with large size ratios flowing onto a quasi-2D bounded heap form stratified layers of large and small particles when the flow rate is modulated. These layers exhibit better average mixing than the segregated patterns generated by steady feed rates. The mechanisms of layer formation under modulated flow differ from those for spontaneous stratification and are related to changes in the composition of the flowing layer at different stages in each feed cycle. The thickness and length of the stratified layers can be controlled by changing the feed rates and feed cycle durations, which is potentially useful for reducing segregation in industrial processes.

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Dynamics of granular segregation in quasi two-dimensional system

Gharat¹

2017

EPJ Web Conf.

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Segregation during flow of granular materials is important from an industrial point of view. Considerable work has been done on granular segregation in heap flows by continuous pouring. We studied the flow and segregation of granular mixtures during heap formation in a quasi two-dimensional rectangular bin by intermittent pouring. The heap formed by repeatedly pouring a fixed mass of the mixture. Each feeding results in the formation of a layer of the mixture on the surface of the heap. The system is a simplified model for the feeding of raw materials to a blast furnace, which is widely used for the manufacture of iron and steel. Experiments were carried out to study the dynamics of granular materials during heap formation. The number density, area fraction and average velocity of small and big particles are plotted across the flowing depth with time. Results shows that larger particles are always on top flowing over small particles. During flow small particles easily percolate through the gaps between the large particles. A thin layer of small particles is also observed at the free surface. Here the system never reached a steady state as we are pouring the mixture intermittently and system is closed. The velocity increases initially and then decreases towards the end. The number density (i.e. area fraction) profile changes for small and big particles during flow. Image analysis is done to detect the position of each particle on the side wall. Each experiment is repeated six times to get average data.

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Granular segregation in quasi-2d rectangular bin

Cited by 4 publications

References 0 publications

A review on flow and segregation of granular materials during heap formation

A review on flow and segregation of granular materials during heap formation

Controlling granular segregation using modulated flow

Dynamics of granular segregation in quasi two-dimensional system

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