As fluids flow more quickly, advective transport begins to dominate over diffusive transport and a transition from diffusion limited precipitation and dissolution to an advection dominated regime occurs. This transition is often quantified by the dimensionless Peclet number, which is a measure of the relative importance of advective and diffusive transport over a characteristic distance such as the overall size of the system or the typical size of a feature of interest. It is the ratio between the fluid velocity and the diffusion coefficient, multiplied by the characteristic length. Peclet numbers much larger than unity imply advection dominated transport. Reactive...

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