Journal ArticleDOI
Turbulent mass transfer rates to a wall for large Schmidt numbers
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TLDR
In this paper, the influence of Schmidt number on the rate of mass transfer between a turbulent fluid and a pipe wall is investigated. But the Schmidt number is only applicable to a vanishingly small portion of the concentration field as Sc → ∞.Abstract:
New measurements are presented on the influence of Schmidt number on the rate of mass transfer between a turbulent fluid and a pipe wall. It is found that for large Schmidt numbers the fully developed mass transfer coefficient is related to the friction velocity and the Schmidt number by the equation
The experiments are accurate enough to rule out the Sc−2/3 or the Sc−2/3 relations commonly used, deduced from plausible limiting expressions for the eddy diffusivity close to a wall. It is argued that these expressions arevalid only over a vanishingly small portion of the concentration field as Sc → ∞.read more
Citations
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Journal ArticleDOI
Oxygen dynamics of marine sediments
TL;DR: A review of the current status on what we know about controls that interrelate with the O2 dynamics of marine sediments can be found in this article, where the authors present case studies from abyssal sediments to microbial phototrophic communities.
Journal ArticleDOI
On the parameters influencing air-water gas exchange
TL;DR: In this article, the Schmidt number dependence of the transfer velocity k changes from k ∝ Sc−⅔ to k √ Sc−½, indicating a change in the boundary conditions at the surface.
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Small-scale hydrodynamics in lakes
Alfred Wüest,Andreas Lorke +1 more
TL;DR: In this article, small-scale turbulence observations allow the mixing regimes in lakes, reservoirs, and other enclosed basins to be categorized into the turbulent surface and bottom boundary layers as well as the comparably quiet interior.
Book ChapterDOI
Mass-Transfer Measurements by the Limiting-Current Technique
TL;DR: Limiting current density refers to the maximum rate at 100% current efficiency at which a particular electrode reaction can proceed in the steady state as discussed by the authors, determined by the composition and transport properties of the electrolytic solution and by the hydrodynamic condition at the electrode surface.
Journal ArticleDOI
The diffusive boundary layer of sediments: Oxygen microgradients over a microbial mat
TL;DR: Surface topography increased the oxygen flux across the sediment-water interface by 49% relative to a one-dimensional diffusion flux calculated from the vertical oxygen microgradients.