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Related Experiment Video

Updated: May 15, 2025

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

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Published on: February 3, 2014

Granular flow-solid wall interaction: investigation of the teapot effect.

Yishan Hong¹, Hongyi Zou¹, Lijun Yang^1,2

¹School of Astronautics, Beihang University, Beijing 100191, China. dongry@buaa.edu.cn.

|April 9, 2025

Summary

Granular flows over solid edges exhibit complex dynamics, splitting into dispersed and uniform regions. Particle cohesion can control flow regimes and dispersion, offering insights into particle-dominated flow.

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Area of Science:

Physics
Fluid Dynamics
Materials Science

Background:

Granular flows interact with solid boundaries, complicating dynamics and natural/industrial phenomena.
The "teapot effect" is known for liquids, but similar phenomena in granular flows are less studied.

Purpose of the Study:

To experimentally investigate granular flow interactions with a wedge-shaped solid edge.
To understand the role of the trailing edge in flow behavior and dispersion.
To develop a method for predicting and controlling granular flow dispersion.

Main Methods:

Experimental investigation of granular flows over a wedge-shaped edge.
Systematic tuning of parameters: inclination angle, particle diameter, edge radii, and surface roughness.
Development and application of a dimensionless number for dispersion prediction.

Main Results:

The trailing edge of the solid boundary significantly influences granular flow, causing velocity non-uniformity.
Flow splits into distinct "dispersed" and "uniform" regions.
A dimensionless number was derived and successfully predicted granular flow dispersion.
Increased particle cohesion shifted flow from heterogeneous structures to grain clusters.

Conclusions:

The trailing edge is critical in granular flow dynamics over complex boundaries.
A dimensionless number effectively predicts and allows regulation of granular flow dispersion.
Particle cohesion offers a mechanism to switch flow regimes and control dispersion.
Findings provide new insights into particle-dominated flow dynamics over solid boundaries.