r | m | Radial distance to rotation axis in centrifuge |
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| m | Average radial distance in centrifuge |
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r0 | m | Radial reference distance in centrifuge at z = 0 (base of sediment or top of cream) |
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RGF | - | Relative Gravity Force = acceleration factor in centrifuge with respect to free fall (RGF = 1 in earth’s gravity) |
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s | - | Structured fabric phase containing dispersed solids and emulsion droplets |
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t | s | Time |
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T | - | Dimensionless time |
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v | m/s | Speed |
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| - | Dimensionless fluid flow speed |
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V | m3/(m2s) | The volume per unit time per unit lateral area |
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WE | - | whole egg |
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x | m | Spatial coordinate, often horizontal |
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z | m | Spatial coordinate, often vertical. Increases with height |
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Z | m | Horizontal distance from bottom vessel in centrifuge |
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δ | - | Dimensionless number for relative importance of gravity over elasticity in earth’s gravity (RGF = 1) and in centrifuge |
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ε | N/m2 | Elasticity |
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| - | Porosity, here fractional volume available for fluid |
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| - | Volume fraction dispersed phase (solids, air, oil, and structurant) |
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| - | Porosity = local fractional volume available for fluid |
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| - | Initial porosity, initial volume fraction available for fluid |
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μ | Pas | Viscosity of a fluid, μw for aqueous phase |
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p | - | pi | p = 3.141592654 |
P | - | Dimensionless Pi number |
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ρ | kg/m3 | Density, mass per unit volume; ρs for dispersed, ρw for fluid |
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τ | s | Relaxation time |
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ω | rad/s | Cyclic frequency |
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ξ | - | Dimensionless vertical distance from bottom of vessel |
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Θ | - | Dimensionless height of depleted zone |
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Ω | m | Height of depleted zone |
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Δρ | kg/m3 | Average density difference between dispersed and fluid phase, positive in sedimentation |
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