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摘要
Chemical effects in groundwater have a major impact on solute transport. However, the study of reactive solute transport in a single fracture, especially the mechanism and simulation of reactive solute transport in nonlinear flow, needs further improvement. In contrast to the experimental studies on the bimolecular reactive transport of solutes in a single fracture, this work combines the Naiver-Stokes (N-S) equation with the reactive advection-diffusion equation (ADRE) to study the reactive solute transport in a single fracture under nonlinear flow conditions. A numerical simulation study of transport is performed, and the effects of fracture aperture, flow velocity, and other factors on the transport properties of reactive solutes are discussed. The results show that the simulation error in predicting the peak value of the reaction product is small (2.2%~3.9%) and that the numerical simulation method based on the N-S and ADRE equations can be used to study the transport of reactive solutes in a single fracture. As the flow velocity increases, the experimental and numerical simulation results show that the hydraulic gradient (J) has a nonlinear relationship with the average flow velocity (v), and the Forchheimer equation can better reproduce the J-v relationship; the controlling factor for the transport of reactive solutes and the reactive product concentration under nonlinear flow conditions is convection, and molecular diffusion is weak; at the same aperture, the peak value of reactive product concentration increases and the arrival time of the peak value decreases with the flow velocity increasing; at the same flow velocity, the peak value of reactive product concentration decreases and the arrival time of the peak value increases with the fracture apertures increasing. ? 2023 Publishing House for Journal of Hydrodynamics.
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