# Test Case for Fuchs Model

## Description

This 0D test case evaluates scrubbing decontamination using the Fuchs model,
which considers three transfer mechanisms: gravitational sedimentation,
centrifugal impaction, and Brownian diffusion, each of which can be enabled or
disabled via dictionary settings.

The gas phase consists of particle and air species, while the liquid phase
consists of particle and water species. The initial volume fractions of both the
gas and liquid phases are set to $0.5$.

At the initial condition, the mass fraction of air in the gas phase is $0.9$,
and that of particle is $0.1$. The model transfers the mass of the particle
species from the gas phase to the liquid phase. The mass transfer rate goes to
zero as the particle mass in the gas phase vanishes.

## Technical Information

- 0D
- $1$ cell
- The mechanisms of gravitational sedimentation, Brownian diffusion, and
  centrifugal impaction
- $d_B = 5$ mm and $d_P = 4e-7$ m
- Multicomponent phases are used for the gas (of air and particle species) and
  the liquid (of particle and water species)

## Post processing

- The ratio of the current to the initial particle volume fraction in the
  gas phase, aka retention ratio, is observed over time

## Remark

Note that the Brownian diffusion mechanism relies on the temperature of the gas
phase.

## Keywords

0D, multiphase, three-phase, multicomponent, gas, solid, liquid, isothermal,
incompressible, scrubbing decontamination[^1] [^2], pool scrubbing,
phase transfer

## Literature

[^1]: Fuchs, N. A. (1955). The mechanics of aerosols.
      Pergamon Press.

[^2]: Charvet, A., Bardin-Monnier, N., & Thomas, D. (2011). Can bubble columns
      be an alternative to fibrous filters for nanoparticles collection?.
      *Journal of Hazardous Materials*, 195, 432-439.
