Using the microscopic multi-fluid model as a starting point we perform fine grid simulations of biclisperse gas-particle flows to examine the dependence of the filtered fluid-particle drag coefficient, particle-particle drag coefficient, and particle phase stress on the volume fractions and sizes of the particles and the filter size. Scalings are identified for the filtered fluid-particle drag coefficient, particle-particle drag coefficient, and particle phase pressure that capture the dependence of each filtered correction on the size and volume fraction ratios of the bidisperse assembly. (C) 2014 Elsevier Ltd. All rights reserved,