화학공학소재연구정보센터
Powder Technology, Vol.382, 573-593, 2021
Quantification of mechanisms governing the angle of repose, angle of tilting, and Hausner ratio to estimate the flowability of particulate materials
The angle of repose, angle of tilting, and Hausner ratio are frequently used to estimate the flowabilities of particulate materials. In this study, these parameters were measured for 65 samples. A visualization study showed that there are three mechanisms affecting the angle of repose. Only one is directly related to the flowability. Crucially, to eliminate the effect of wall friction, the measurement of the angle of repose should be conducted on a high friction surface (such as one covered in glue) or within a ring. Further, although all three parameters can be described as a function of the Archimedes number, the performance of each material was different; thus, the results cannot be generalized. Only the Hausner ratio could be defined reasonably by a single function. A new flowability classification was developed for the three parameters, and the best metric to define flowability was found to be the Archimedes number. (C) 2021 Elsevier B.V. All rights reserved.