Dissipation of Energy by Dry Granular Matter in a Rotating Cylinder

Sack, Achim; Pöschel, Thorsten

doi:10.1038/srep26833

Cited by 12 publications

(3 citation statements)

References 42 publications

(64 reference statements)

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“…Finally, many materials such as cement, pharmaceuticals, and polymers are made by mixing and grinding in cylindrical capsules (2). As a result of these experiments, engineers will be able to understand how the mixing and grinding processes can be controlled to minimize energy loss (7,8).…”

Section: Discussionmentioning

confidence: 99%

The Effect of Bead Shape and Texture on the Energy Loss Characteristics in a Rotating Capsule

Misra,

Misra

2019

J Emerg Invest

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Energy loss characteristics in a rotating bead-filled capsule are impacted by bead shape, size, surface texture, density, and capsule fill level. In this paper, the energy loss results are reported from experiments of bead-filled cylindrical capsules rolling down a ramp in a controlled manner without sliding. These experiments were motivated by the potential applications of bead-filled capsules for energy dissipation and vibration control systems, as well as for understanding energy use in rotating drum-based industrial processes. The experiment used a plexiglass cylindrical capsule filled with beads of different sizes, materials, and textures. The bead-filled capsule was rolled down an inclined ramp and came to a stop on a level ramp. The position at which the capsule stopped was recorded. As the capsule rolled down the ramp, the potential energy converted to kinetic energy. When the kinetic energy dissipated, the capsule came to a stop. The distance traveled by the capsule is controlled by the energy loss caused by the collision and the friction of the beads. The nature of the collision and friction of the beads depended on the amount, size, type, and texture of the beads in the cylinder. The data was analyzed to determine the conditions for optimal fill level, which is defined as the case for maximum energy loss. We found that the intermediate filling level had the most energy loss. This optimal filling was obtained for each bead type.The maximum energy dissipation increased with bead surface texture and bead density but decreased with bead size.

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Section: Discussionmentioning

confidence: 99%

The Effect of Bead Shape and Texture on the Energy Loss Characteristics in a Rotating Capsule

Misra,

Misra

2019

J Emerg Invest

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“…Mixers commonly used in industrial applications include bladed mixers [7,8], rotating drums [9,10], agitated filter beds [11,12], and fluidised beds [13,14]. However, bladed mixers (e.g., the overhead stirrers) possess the advantage of their simpler design and relatively shorter blending time [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat generation during the mixing of granular materials in an overhead stirrer

Kisuka

Rangel

Hare

et al. 2023

Preprint

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Bladed mixers are widely used for processing granular materials where significant mechanical energy is required to produce the desired blend. Some mechanical energy is dissipated within the granular medium, generating heat during this process. However, our knowledge of the heat generation mechanisms without external thermal loads is still lacking. This study uses an overhead stirrer to mix granular materials and investigate heat generation by monitoring the temperature changes in the granular bed. Additionally, first-order kinetic equations are used to extrapolate the experimental data to a thermal equilibrium where the heat generation and heat loss rates are equal. Lead, steel, and glass particles are used under various operating conditions. It is observed that metallic particles heat up faster owing to their lower heat capacity. Also, increasing the rotation speed, fill ratio and particle size result in a greater temperature increase. Moreover, flat blades induce more heat generation compared to tilted blades.

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“…Mixers commonly used in industrial applications include bladed mixers, 7,8 rotating drums, 9,10 agitated filter beds, 11,12 , and fluidized beds. 13,14 However, bladed mixers (e.g., the overhead stirrers) possess the advantage of their simpler design and relatively shorter blending time.…”

mentioning

confidence: 99%

Experimental investigation of heat generation during the mixing of granular materials using an overhead stirrer

Kisuka,

Rangel,

Hare

et al. 2023

AIChE Journal

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Bladed mixers are commonly used for processing granular materials, requiring significant mechanical energy for optimal blending. During this process, heat is generated due to dissipated mechanical energy within the granular medium. However, our understanding of heat generation mechanisms without external thermal loads is limited. This article investigates heat generation by monitoring temperature changes in granular beds mixed using an overhead stirrer. First‐order kinetic equations are employed to extrapolate experimental data to a thermal equilibrium where heat generation and loss rates are balanced. Lead, steel, and glass particles are utilized under different operating conditions. Notably, metallic particles exhibit faster heating due to their lower heat capacity. Increasing rotation speed, fill ratio, and particle size result in greater temperature rises. Additionally, flat blades generate more heat compared to tilted blades. Through dimensional analysis, the experimental data are collapsed into linear curves that correlate system power consumption and granular bed temperature with operating conditions.

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Dissipation of Energy by Dry Granular Matter in a Rotating Cylinder

Cited by 12 publications

References 42 publications

The Effect of Bead Shape and Texture on the Energy Loss Characteristics in a Rotating Capsule

The Effect of Bead Shape and Texture on the Energy Loss Characteristics in a Rotating Capsule

Experimental investigation of heat generation during the mixing of granular materials in an overhead stirrer

Experimental investigation of heat generation during the mixing of granular materials using an overhead stirrer

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