Avalanching patterns of irregular sand particles in continual discrete flow*

Han, R. K; Zhang, Yufeng; Li, Ran; Chen, Quan; Feng, Jingyu; Kong, Ping

doi:10.1088/1674-1056/ab65b8

Cited by 4 publications

(2 citation statements)

References 32 publications

(38 reference statements)

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“…Since then this method was used to measure the speed of rough surface fluid and solid-liquid two-phase flows. [17][18][19][20] With time and development of new spatial filtering methods, CCD cameras have gradually replaced traditional structural gratings. The CCD camera acts as a spatial filter and a photo-receiving device, making the speed measurement structure much simpler.…”

Section: Introductionmentioning

confidence: 99%

Improved spatial filtering velocimetry and its application in granular flow measurement*

Kong

Wang

et al. 2020

Chinese Phys. B

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Spatial filtering velocimetry (SFV) has the advantages of simple structure, good stability, and wide applications. However, the traditional linear CCD-based SFV method requires an accurate angle between the direction of linear CCD and the direction of moving object, so it is not suitable for measuring a complex flow field or two-dimensional speed in a granular media. In this paper, a new extension of spatial filtering method (SFM) based on high speed array CCD camera is proposed as simple and effective technique for measuring two-dimensional speed field of granular media. In particular, we analyzed the resolution and range of array CCD-based SFV so that the reader can clarify the application scene of this method. This method has a particular advantage for using orthogonal measurement to avoid the angle measurement, which were problematic when using linear CCD to measure the movement. Finally, the end-wall effects of the granular flow in rotating drum is studied with different experimental conditions by using this improved technique.

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Section: Introductionmentioning

confidence: 99%

Improved spatial filtering velocimetry and its application in granular flow measurement*

Kong

Wang

et al. 2020

Chinese Phys. B

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“…The increased applied relevance of the problem has recently caused a sharp increase in research activity in predicting the unstable behavior of the granular filling of a rotating drum. Of greatest interest is the behavior of the free filling surface, which undergoes significant complex deformations during self-constriction of pulsations [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Establishing the Rotation Speed Variation Range Limits for Auto-Excitation of Self-Oscillating Grinding in a Tumbling Mill

Deineka¹,

Naumenko²

2020

Technology transfer: fundamental principles and innovative tech

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The influence of the structure of a two-fraction polygranular feed of the chamber on the value of the drum rotation speed at auto-excitation of self-excited oscillations with a maximum swing is considered. Such a pulsating mode of movement of the charge is used in the self-oscillating process of grinding in a tumbling mill. The coarse fraction simulated the grinding bodies was steel bullets with a relative size ψdb=0.026. The fine fraction, simulated the particles of the crushed material, was a cement clinker with a relative particle size ψdm=0.00013. Variable factors of experimental studies were: the degree of filling the chamber in the state of rest κbr=0.25; 0.29; 0.33 and the degree of filling the gaps between the particles of the coarse fraction with particles of the fine fraction κmbgr=0.0625; 0.375; 0.6875; 1. The method of visual analysis of transient processes of self-oscillating modes of feed behavior in the cross section of the rotating drum chamber is applied. Measurements of the speed limits of the drum rotation were carried out with auto-excitation of self-oscillations of the filling. The magnitude of the self-oscillation swing was estimated by the increase in the difference between the maximum and minimum values of the filling dilatancy for one period of pulsations. An increase in the upper limit of the speed range ψω2 with a decrease in κbr and κmbgr was established. The growth rate of ψω2 increases at low values of κbr and κmbgr. Some increase in the lower limit of the ψω1 range with a decrease in κbr and κmbgr was revealed. An increase in the range of speeds of rotation was recorded at the maximum range of self-oscillations ψω1–ψω2 with a decrease in the connected interaction of the intra-mill filling. This coherent interaction is due to an increase in κbr and κmbgr. The value of the ψω1–ψω2 range varies from 1.01–1.03 at κbr=0.33 and κmbg=1 to 1.22–1.66 at κbr=0.25 and κmbgr=0.0625. The range gets its maximum value with fine and superfine grinding

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The propagation of Quasi-static region during granular impact

Yang

Xiu

et al. 2023

Particuology

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Avalanching patterns of irregular sand particles in continual discrete flow*

Cited by 4 publications

References 32 publications

Improved spatial filtering velocimetry and its application in granular flow measurement*

Improved spatial filtering velocimetry and its application in granular flow measurement*

Establishing the Rotation Speed Variation Range Limits for Auto-Excitation of Self-Oscillating Grinding in a Tumbling Mill

The propagation of Quasi-static region during granular impact

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