All Questions
6 questions with no upvoted or accepted answers
6
votes
0
answers
300
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Why is the Fokker-Planck equation only valid for the forward and backward velocities but not for the flux velocity?
I noticed that the Fokker-Planck equation is often only written for the forward velocity $\vec b$ and the backward velocity $\vec b^*$:
\begin{align}
\partial_t \rho + \nabla (\vec b \rho) &= D \...
- 10.3k
3
votes
0
answers
146
views
How does air going through silica gel change its humidity
Assume that the properties(temperature,humidity,velocity and so on) of the incoming air flow stay constant. The air flow goes through a silica gel plate. Humidity of the air will decrease, but how to ...
- 31
1
vote
0
answers
343
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How does fluid velocity affect the dissolution of some solute in the fluid?
Suppose we have a perfect sphere of some solute such as sugar and we place it in a fluid such as water, at a certain temperature, that is not moving. It will dissolve and diffuse into the water due to ...
- 289
0
votes
0
answers
108
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How to calculate convection between a hot and a cold area through a circular hole?
Consider the below problem:
where we have two half infinite worlds with $T_2 < T_1$ and a circular hole with the diameter of $D$ in an infinite isolating wall. There is no ...
- 373
0
votes
0
answers
40
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Can one model fluid flow only by using the convection–diffusion equation?
Modeling fluid flow in a coil seems very complicated, especially for turbulent flow. Having Navier-Stokes equations seems to be the right way to go, but I was wondering... can one use the convection-...
- 564
0
votes
0
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94
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Diffusion of solute in a dynamic solvent
Consider this hypothetical equipment.
A pipe made of semi-permeable membrane (permeable only to the solute)
has a streamline flow of pure water going from A to B ($P_A>P_B$). Midway, another
...
- 3,168