In order to understand the influence of the geometry of ceramic filter orifices on the movement of micro-scale inclusions, a transient 3D coupled numerical model has been established. The inclusion trajectory was described using the two-way coupled Euler-Lagrange approach. The gravity, buoyancy, drag, virtual mass, lift, pressure gradient, centrifugal forces, and moment of inertia were taken into account. The random walk module was invoked to include the chaotic effect of the turbulence. For estimating the collision and coalescence of the inclusion, the stochastic collision module was utilized. Besides, three detachment criteria have been introduced to represent the adherence behavior between the inclusion and the refractory wall. Necessary measurements were carried out for validating the model experimentally. Due to the swirling flow and the centrifugal effect, the inclusion removal ratio of the helical orifice is 31.02%, which is higher than the value of 16.35% associated with the straight orifice. (C) 2020 Elsevier B.V. All rights reserved.