Figure 2.

Determining state of percolation

(A) Micro-XCT reconstructed volume of an entire direct reduction pellet along with a 2D slice and extracted pore network model (for full pellet) computed using OpenPNM.

(B) Cluster size distribution of pores extracted from the nano-XCT volumes. Cluster size is computed as the number of pores constituting a particular cluster and is dimensionless.

(C) Tracking reduction in porosity fraction using the erosion operator to simulate nonpercolated pore networks from percolated pore networks. Orange network images display the porosity fraction measured at 100 s (p = 0.32), the network after 32 isotropic erosion steps for p = p_c, and finally the subpercolated network at p = 0.09. Data at p_c are represented as mean ± SD.