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Video Transcript for Powder Wall Friction Against Surfaces:
The sliding friction of a powder against a surface plays a significant role in the handling and transport of bulk solids.
Funnel flow, ratholing, bridging and fouling are all common undesirable consequences of high wall friction between a powder and a process surface, making the incorporation of wall friction measurements into plant design calculations a necessity.
Measuring powder wall friction entails measuring the steady-state shear stress at a range of load stresses as the powder slides against a surface. The coefficient of friction is calculated from the ratio of shear stress to load stress and the more commonly used metric of wall friction angle is simply the inverse tangent of this.
Surface coupons of various materials and roughness can be employed in the test to mimic current process equipment or screen potential interventions and remedial actions.
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