| a | air |
| d | diameter, m |
| g | mass flux kg/(m2·s) |
| ol | oil |
| PPI | pore density of metal foam (pore per inch) |
| Q | volumetric flow rate m3/s |
| ν | velocity m/s |
| w | water |
| x | mass fraction |
| X | parameter calculated acc. Equation (3) |
| Y | parameter calculated acc. Equation (4) |
| Greek symbols | |
| ε | porosity of foam |
| λ | parameter calculated acc. Equation (5) |
| μ | viscosity Pa⋅s |
| ξ | volume fraction |
| ρ | density kg/m3 |
| σ | surface tension N/m |
| ψ | parameter calculated acc. Equation (6) |
| Subscripts | |
| c | cell |
| f | phase, fluid |
| G | gas |
| L | liquid |
| p | pore |
| s | superficial |
| T | gas−liquid two–phase flow |
| w | water |
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