Table 2 Variables and parameters used in the simulations
From: Respiratory particles: from analytical estimates to disease transmission
Variable/Parameter | Value | Unit | Description |
|---|---|---|---|
\(m_{p}\) | Â | g | mass of a particle |
C | Â | n/m3 | number density of particles |
K | Â | 1/s | deposition rate |
V | 0.01, 0.028 | 1/s | inactivation rate ([1]) |
J | Â | n/(m2s) | convection diffusion flux |
\(R_{0}\) | 2, 60 | μm | initial radius ([27]) |
\(\phi _{0}\) | 0.1 | - | percent of non volatile content ([4]) |
RH | 0.5, 0.8 | - | relative humidity ([1]) |
\(t_{ev}\) | 5 | s | evaporation time |
\(t_{d}\) | 0.5 | s | duration of the respiratory event |
\(T_{e}\) | 10 | s | observation time |
\(\rho ^{n}_{p}\) | 998.6 | Kg/m3 | nucleus density ([6]) |
D | 1.8 × 10−5 | m2/s | diffusion coefficient ([23]) |
\(\rho _{f}\) | 1.2077 | Kg/m3 | fluid density ([6]) |
μ | 1.8 × 10−5 | m2/s | effective viscosity ([23]) |
p | Â | Pa | atmospheric pressure |
|g| | 9.8 | m/s2 | gravity acceleration |
\(C_{d}\) | Â | Â | drag coefficient |
\(u_{s}\) | Â | m/s | settling velocity of the particles |
\(u_{f_{in}}\) | Â | m/s | inlet velocity profile ([11]) - cough event |
\(u_{w}\) | 0.1, 2 | m/s | last component of an horizontal ventilation velocity |
\(\alpha _{W}\), \(\alpha _{D}\) | 1 | m/s | transfer coefficient - particle’s flux |