Aim: To determine the flow properties of powders/granules (by determining the carr’s index/bulk density).
Principle: The flowability is related to carr’s index. Carr’s index is described as
The lower ‘carr’s index, the better the flow.
Apparatus and materials required: Same as that described under bulk density experiment.
Determination of tapped density and poured density:
- A fixed quantity of powder is poured into a measuring cylinder and the volume is noted. This figure is used for calculating poured density.
- The tapped density is then determined as described under the bulk density determination experiment (tapped density and bulk density are the same).
Observation and Calculation:
Poured density determination: Weight of powder = W1g;
Volume of powder = V1 cc
Bulk density determination :
Weight of powder = W2 g; Volume of powder = V2cc
The carr’s index of is _______is____
Report: The flow property of powder is excellent/good/fair/poor.
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