Mao bin hu g c yang q y liu r jiang q s wu humaobin@ustc edu cn
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granular Chute flow with Two turnings : Flowing behavior and Its optimization PowerPoint PPT Presentation


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Mao-Bin HU ( 胡茂彬 ), G.C. Yang( 杨果成 ), Q.Y. Liu( 刘启一 ), R. Jiang ( 姜锐 ), Q.S. Wu( 吴清松 ) [email protected] granular Chute flow with Two turnings : Flowing behavior and Its optimization. Contents. 1. Motivations 2. Experiment Setup 3. Flowing Behavior 4. Simulation

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granular Chute flow with Two turnings : Flowing behavior and Its optimization

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Mao-Bin HU (胡茂彬), G.C. Yang(杨果成),

Q.Y. Liu(刘启一), R. Jiang (姜锐), Q.S. Wu(吴清松)

[email protected]

granular Chute flow with Two turnings:Flowing behavior and Its optimization


Contents

  • 1. Motivations

  • 2. Experiment Setup

  • 3. Flowing Behavior

  • 4. Simulation

  • 5. Optimization Discussions


Motivations


1.Motivations: Landslides


Bio-systems (bottleneck & bending)

Molecule Motor

Blood Cell


Bottlenecks in Coal Pipelines

Merging &

Width Decrease

Bending


Traffic Flow & Pedestrian Flow


Experiment


Experiment Setup


Dilute - Dense flow transition

K. To, P.-Y. Lai, H. K. Pak, Phys. Rev. Lett. 86, 71 (2001).

M. Hou, K. Lu, C.K. Chan, Phys. Rev. Lett.91, 204301 (2003).


Bi-Stable Phenomenon


Initial Condition Dependence

Dilute

Dense

Dense

Dilute Flow

Dense Flow

Dilute

Dense

High Initial Flux

Low Initial Flux


Initial Flux depends on Packing

Crystal pack

Loose pack

Huang D, Sun G, Lu K, Phys. Rev. E 74, 061306 (2006). c


Flux – Width Relation


Effective

Width

Increase

Stable

Heap


Stable Heap

N. Taberlet, etal, Phys. Rev. Lett. 91, 264301 (2003).


Simulation


Dilute –Dense transition condition for turning A

c

Jin

Jout


v

v


Optimization Discussions

  • 1. Adjust the main section width below the dilute-dense transition point

  • 2. Watch that no stable heap can develop in the main section

  • 3. In the bi-stable region, get a higher initial flux

  • 4. Increase outlet width D2, so that only turning A plays the role of bottleneck


Thank you !


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