A 3D dual pore-system leaching model. Part 1: Study on fluid flow

摘要: Abstract Two scale pore networks are retrieved from computerised tomographic (CT) images of a leaching column based on the detected dual pore-size distribution. The ‘macro-pore’ network is comprised void space between ore particles, where liquid allowed to flow as in free channels, while ‘micro-pore’ resides through which path can only be achieved by percolation. system refers porous stack, both macro- and micro-pore exist two different patterns prevail. characterisation carried out firstly generating finite element geometries meshes simultaneously estimating porosity; anisotropic intrinsic permeability calculated simulation (using Navier–Stokes equations) within Darcy's definition permeability. pore-system then derived integrating characteristics into macro-pore stack. Subsequently, with equations governing Brinkman's seepage network, model established solved. Ultimately, comparison fluid velocity among uniform model, single made, preferential pathways heterogeneous models analysed, suggesting that it necessary adopt capture behaviour system.