characterising semi cohesive powders using Angle of Repose

When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper.

The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device’s funnel has been eliminated.

A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart’s classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.

Characterising Semi‐Cohesive Powders using Angle of Repose

When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper.

The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device’s funnel has been eliminated.

A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart’s classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.

CHARACTERIZATION of POWDER FLOWABILITY USING MEASUREMENT of Angle of Repose

In response to the need in industry for a quick and reproducible method of measuring the flowability of powders in processes involving transport and storage, the apparently simple idea of measuring Angle of Repose has been revived. The simple tester first used has evolved over a number of years into the present version which is shown to be capable of handling quite small samples of powders that are even slightly cohesive. Experimental data are presented and results shown to compare consistently with the better known Hausner ratio.

Characterising Semi‐Cohesive Powders using Angle of Repose

When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper.

The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device’s funnel has been eliminated.

A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart’s classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.

characterising semi cohesive powders using Angle of Repose

When properly measured and interpreted Angle of Repose (AOR) can be a useful method of characterising a powder. Unfortunately, a multitude of definitions and measuring equipment is used. A review of the inherent problems is presented in the first part of this paper.

The second part of the paper describes the improvements made to a measuring device developed originally for measuring the Angle of Repose of soda ash, so that a wider range of powders can be tested. In the improved design, the tendency of cohesive and semi-cohesive powders to block the device’s funnel has been eliminated.

A total of 73 powders consisting of four different materials, and covering Groups A, A/C and C of Geldart’s classification, have been tested using the new equipment. The results show that AOR increases systematically with decrease in mean particle size. Combination of AOR measured in the new device with aerated bulk density provides a quick, sensitive and effective method for characterising a wide range of powders.