POROSITY AND HYDRAULIC RESISTANCE
OF A BIDISPERSE MIXTURE

J. G. Dueck

UDC 539.6,539.217

The known nonmonotonic dependence of a bidisperse mixture 
porosity on the portion of the small fraction at arbitrary diameter 
ratios between small and large particles has been modeled. The expressions 
for the mixture porosity obtained in the course of modeling have been 
compared to the experimental data. With the use of the derived expressions 
for the mixture porosity, the hydraulic resistance of a layer from 
a bidisperse material has been calculated. It has been shown that 
in accordance with the experiment at a small ratio between the sizes 
of small and large particles the dependence of the hydraulic resistance 
of a bidisperse layer on the portion of the small fraction has a maximum 
which is higher than the resistance in the absence of large particles. 
The agreement between theory and experiment is quite satisfactory.

Erlangen-Nuremberg University (Germany); email: Johann.Dueck@uvt.uni-erlangen.de. 
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80,
No. 4, pp. 25-34, July-August, 2007. Original article submitted 
January 19, 2006.