Particle movement characteristics in a gas-solid vertical single helical ribbon agitated reactor

2021 ◽  
pp. 132349
Author(s):  
Tianzhou Ye ◽  
Yao Yang ◽  
Jingyuan Sun ◽  
Zhengliang Huang ◽  
Binbo Jiang ◽  
...  
Keyword(s):  
Particle Movement ◽  
Helical Ribbon ◽  
Movement Characteristics

scholarly journals Study on particle movement characteristics in sandblast cylinder based on PIV technology

2020 ◽  
Vol 22 (3) ◽  
pp. 38-47
Author(s):  
Zhiquan Hui ◽  
Feng Wu ◽  
Haojie Duan ◽  
Bo Yang ◽  
Jinmei Lin ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Particle Velocity ◽  
Axial Velocity ◽  
Particle Sizes ◽  
Tank Wall ◽  
Particle Movement ◽  
Cylindrical Section ◽  
Movement Characteristics ◽  
Conical Section ◽  
Selection Factors

AbstractPIV technology was used to investigate the influence of the particles’ relevant parameters on the instantaneous movement characteristics in the sandblast cylinder under the circumstance of different particle sizes, different section heights and different stacking conditions. As the diameter increased, particles had a greater velocity and energy when approaching the wall, which would cause a serious abrasion. The influence of test selection factors on the particles’ radial velocity of particles was greater than that on axial velocity. The radial velocity and axial velocity on the surface of the cylindrical section were all reduced to a lower level when the particles approach the tank wall. When r > 0.3 R, the particle velocity maintained at a higher level, but then decreased slowly when r > 0.7 R. Therefore, the abrasion of the conical section of the sandblast cylinder when r > 0.3 R should be paid more attention to.

scholarly journals The Movement Characteristics of Coal Granular Body in Excavating Rescue Channel in the Collapsed Body

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Hao Chuanbo ◽  
Liu Zhenwen ◽  
Xiao Fukun ◽  
Liu Gang ◽  
Zhang Rui
Keyword(s):  
Mechanical Characteristics ◽  
Lateral Pressure ◽  
Slip Surface ◽  
Pressure Coefficient ◽  
Loose Body ◽  
Particle Movement ◽  
Granular Body ◽  
Lateral Pressure Coefficient ◽  
Movement Characteristics ◽  
Occurrence Mode

The collapsed body formed after the underground power disaster is broken into loose body. The mechanical characteristics of the collapsed body are quite different from those of the homogeneous rock mass, and the rescue tunnel is affected by its moving characteristics. In this study, the lateral pressure coefficient of the collapsed body and the angle of the slip surface were deduced. The numerical experiment based on CDEM slump excavation was performed. The accumulation state of the collapsed body and the active lateral pressure coefficient and the angle of the slip surface are obtained. The characteristics of the force of the accumulation body which naturally collapsed were studied. Particle size, excavation position, excavation shape, volume, and the influence of natural repose angle on the occurrence mode and particle movement were obtained; the velocity field and slip surface of the lower left and middle lower parts during excavation and the variation of the natural repose angle were analyzed.

scholarly journals Evaluating Gyratory Compaction Characteristics of Unbound Permeable Aggregate Base Materials from Meso-Scale Particle Movement Measured by Smart Sensing Technology

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4287
Author(s):  
Yuanjie Xiao ◽  
Meng Wang ◽  
Xiaoming Wang ◽  
Juanjuan Ren ◽  
Weidong Wang ◽  
...  
Keyword(s):  
Motion Sensors ◽  
Particle Movement ◽  
Compaction Process ◽  
Movement Characteristics ◽  
Macro Scale ◽  
Field Compaction ◽  
Gyratory Compaction ◽  
Scale Particle ◽  
Meso Scale

The quality of compaction of unbound aggregate materials with permeable gradation plays a vital role in their field performance; however, there are currently few unanimously accepted techniques or quality control criteria available for ensuring adequate compaction of such materials in either laboratory or field applications. This paper presented testing results of a laboratory gyratory compaction study where the combinations of gyratory parameters were properly designed using the orthogonal array theory. Innovative real-time particle motion sensors were employed to record particle movement characteristics during the compaction process and provide a meso-scale explanation about compaction mechanisms. Particle abrasion and breakage were also quantified from particle shape digitized from the three-dimensional (3D) laser scanner before and after compaction. The optimal combination of gyratory parameters that yields the best compaction performance was determined from the orthogonal testing results with the relative importance of major influencing parameters ranked accordingly. Meso-scale particle movement at the upper center and center side positions of the specimen are promising indicators of compaction quality. The gyratory compaction process can be consistently divided into three distinct stages according to both macro-scale performance indicators and meso-scale particle movement characteristics. A statistically significant bi-linear relationship was found to exist between relative breakage index and maximum abrasion depth, whereas the quality of compaction and the extent of particle breakage appear to be positively correlated, thus necessitating the cost-effective balance between them. The results of this study could provide technical insights and guidance to field compaction of unbound permeable aggregates.

Towards smart compaction: Particle movement characteristics from laboratory to the field

2019 ◽  
Vol 218 ◽  
pp. 323-332 ◽  
Author(s):  
Xue Wang ◽  
Shihui Shen ◽  
Hai Huang ◽  
Zhidong Zhang
Keyword(s):  
Particle Movement ◽  
Movement Characteristics

15–16 year old female basketball, volleyball and soccer players’ vertical movement characteristics

2017 ◽  
Vol 4 (90) ◽  
pp. 68-74
Author(s):  
Darius Radžiukynas ◽  
Nelė Žilinskienė ◽  
Eglė Kemerytė - Riaubienė ◽  
Raminta Sakalauskaitė
Keyword(s):  
Vertical Movement ◽  
Soccer Players ◽  
Movement Characteristics

scholarly journals Eye Movements in Response to Pain-Related Feelings in the Presence of Low and High Cognitive Loads

2020 ◽  
Vol 10 (5) ◽  
pp. 92
Author(s):  
Ramtin Zargari Marandi ◽  
Camilla Ann Fjelsted ◽  
Iris Hrustanovic ◽  
Rikke Dan Olesen ◽  
Parisa Gazerani
Keyword(s):  
Eye Movements ◽  
Cognitive Load ◽  
Eye Movement ◽  
Cognitive Processing ◽  
Pain Perception ◽  
Cognitive Task ◽  
Load Level ◽  
Task Load ◽  
Pupillary Responses ◽  
Movement Characteristics

The affective dimension of pain contributes to pain perception. Cognitive load may influence pain-related feelings. Eye tracking has proven useful for detecting cognitive load effects objectively by using relevant eye movement characteristics. In this study, we investigated whether eye movement characteristics differ in response to pain-related feelings in the presence of low and high cognitive loads. A set of validated, control, and pain-related sounds were applied to provoke pain-related feelings. Twelve healthy young participants (six females) performed a cognitive task at two load levels, once with the control and once with pain-related sounds in a randomized order. During the tasks, eye movements and task performance were recorded. Afterwards, the participants were asked to fill out questionnaires on their pain perception in response to the applied cognitive loads. Our findings indicate that an increased cognitive load was associated with a decreased saccade peak velocity, saccade frequency, and fixation frequency, as well as an increased fixation duration and pupil dilation range. Among the oculometrics, pain-related feelings were reflected only in the pupillary responses to a low cognitive load. The performance and perceived cognitive load decreased and increased, respectively, with the task load level and were not influenced by the pain-related sounds. Pain-related feelings were lower when performing the task compared with when no task was being performed in an independent group of participants. This might be due to the cognitive engagement during the task. This study demonstrated that cognitive processing could moderate the feelings associated with pain perception.

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