Abstract
The 3D lattice Boltzmann (LB) method was used to model mixing at three types of continuous fracture intersections: planar, fluted (containing parallel grooves), and rough‐walled. Peclet number (Pe) varied from 3 to 400, and Reynolds number (Re) varied from 0.5 to 100. In both planar‐ and rough‐walled intersections, the mixing ratio (Mr) decreases with increasing Pe, though the decrease is less dramatic for the rough‐walled geometry. In planar‐walled intersections, the Mr decreases with increasing Re; however, the fluted and rough‐walled intersections show the opposite trend. Overall, the impact of inertial effects is slight for Re ≤ 10. The effects of channel length are also small; the calculated Mr varies little for LB simulations with length/width ≥ 1.
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