Research on the Convection-Reaction-Diffusion Model of Contaminants in Fracturing Flowback Fluid in Non-Equidistant Artificial Fractures with Arbitrary Inclination in (3+1)-Dimensional Space-Time.

As the molecular diffusion coefficient D increases, it means that the diffusion degree of chloride ions in the fracture increases. Therefore, the increment of chloride ions generated by the diffusion effect increases, and it leads to an increasing trend in the peak concentration of chloride ions at the right wing inlet of the i -th artificial fracture.

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