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transport of diluted species

Posted Mar 25, 2018, 11:11 p.m. EDT Porous Media Flow Version 5.3 1 Reply

小杰 莫
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hello I am simulating NH4-N reduction process when there is microbe existing in the groundwater,while I find the concentration drops fast in just one days and keeping almost the same later.I wanna know how to solve the problem and why this phenomena exists. Any help is appreciated.

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1 Reply Last Post Mar 26, 2018, 7:07 a.m. EDT
Lasse Murtomäki
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Posted: 7 years ago Mar 26, 2018, 7:07 a.m. EDT

Hi

First, look at the concentration scale, the concentration drops only less than 1%. What is the size of the droplets? In the small scale diffusion is very fast, especially in spherical symmetry. Therefore, steady-state is reached almost instantaneously. You did not give any closer details, so it is difficult to comment any further.

BR Lasse

Hi First, look at the concentration scale, the concentration drops only less than 1%. What is the size of the droplets? In the small scale diffusion is very fast, especially in spherical symmetry. Therefore, steady-state is reached almost instantaneously. You did not give any closer details, so it is difficult to comment any further. BR Lasse

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