Introduction to flowability

Knowledge of the flow properties/flowability of a powder or a bulk solid is necessary in relation to bulk solid handling equipment so that no flow problems (flow obstructions, segregation, irregular flow, flooding, etc.) occur.

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Physical properties such as particle size, size distribution, shape, surface area, and density all play a role in how powders flow. Anyone who handles powders understands that flow properties can easily change when a material is moved from one environment to another. Environmental conditions during processing, handling, or transport including temperature, humidity, electrostatic charge, and time can critically affect flow. For these reasons, multiple testing conditions should optimally be used to analyze the way a powder will flow in a given processing environment.

The test describes the flowability (cohesiveness) of the substance in accordance with the procedure described in Ph.Eur. Additionally, the angle of repose can be measured.

Instrument and measuring principle

The flow rate (g per sec.) for a predetermined amount of substance is measured in a standardized funnel described in Ph. Eur. The aperture diameter can be varied.

Technical info

Sample amount : 80 g of substance