Mono-Size Distribution Index (MSDI): A new criterion for the quantitative description of size distribution

Document Type : Research Article


Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran


Graphical size distribution is widely used in different fields of science and studies related to powders, droplets, bubbles, and pores. However, in some condition it may also be necessary to express the size distribution quantitatively. In spite of there being several suggested ways to quantify size distribution in the literature, some of these approaches are not applicable for many methods and the rest have other drawbacks. In this study, first, some quantitative size distribution methods (such as the polydispersity index) and their defects are concisely discussed. SPAN seems to be the most generally appropriate method, its parameters are determined from cumulative size distribution data. Nevertheless, some specific results imply that there are still some drawbacks in this method. Next, a new quantitative description of size distribution is presented which is applicable to many different techniques. In this method the characterization value is limited to 0 and 1, where 0 is related to completely polydispersed size distribution and 1 denotes the completely monodispersed size distribution.

Graphical Abstract

Mono-Size Distribution Index (MSDI): A new criterion for the quantitative description of size distribution


  • Quantitative description of particle size distribution (PSD).
  • Drawback of previous descriptive parameters of PSD.
  • Propose a new parameter named mono-size distribution index (MSDI).


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