Symbols
Dimensionless Groups
| Bo | Bond number |
| Ca | Capillary number |
| Da | Damköhler number |
| De | Dean number |
| El | elasticity number |
| Fo | Fourier number |
| Kn | Knudsen number |
| Le | Lewis number |
| Pe | Peclet number |
| Pr | Prandtl number |
| Ra | Rayleigh number |
| Re | Reynolds number |
| Sc | Schmidt number |
| We | Weber number |
| Wi | Weissenberg number |
Greek Symbols
| α | flow rate ratio (Section 5.3) |
| αth | thermal expansion coefficient |
| α,β | geometry parameters (Section 5.5) |
| α,β | switching ratio and focusing ratio (Section 5.5.3) |
| β | friction coefficient (Section 2.2.2) |
| β | thermal expansion coefficient |
| β | viscosity ratio (Section 2.1.2.2) |
 | shear rate |
| γ | flow rate ratio |
| δ | Dirac function |
| ΔΦ | angular displacement |
| ɛ | characteristic energy (Sections 2.1.1 and 2.2.3) |
| ɛ | dielectric constant |
| κ | curvature (Section 2.4.2.3) |
| λ | Lyapunov exponent (Section 6.4.2) |
| λ | geometry parameter (Section 2.4.2.3) |
| λ | mean free path |
| λ | optical wavelength (Chapters 4 and 8) |
| λd | Debye length |
| η | efficiency |
| μ | dynamic viscosity |
| ν | kinematic viscosity |
| Φ | dissipation function |
| ρ | density |
| Ψ | electric potential |
| ψ | stream function |
| σ | characteristic diameter of a molecule (Section 2.1.1) |
| τ | characteristic time |
| θ | angle, azimuthal angle |
| θ | relative temperature (Section 6.4.1.3) |
| θ | variable used in Fourier series (Sections 2.1.2.2 and 5.5.2) |
| ρel | charge density |
| σ | area density (Section 7.7.1) |
| σ | surface tension, interfacial tension |
| σel | electric conductivity |
| χ | susceptibility |
| τ | torsion (Section 2.4.2.3) |
| Ω | collision integral |
| Ω | strength function of Dean vortices (Section 5.2.1) |
| ω | angular frequency |
| ζ | zeta potential |
Latin Symbols
| A | surface area |
| B | magnetic flux density field |
| c | concentration |
| c | propagation speed of a wave (Section 7.7.1) |
| cp | specific heat |
| D | displacement field |
| D | diffusion coefficient |
| e | elementary charge |
| Eel | electric field strength |
| Emech | Young's modulus |
| f | force vector |
| F | Faraday constant (Section 2.6.1.6) |
| F | force |
| f | frequency |
| g | gravity vector |
| I | intensity value |
| J | current density field |
| J | mass flux |
| kB | Boltzmann constant |
| m | dipole moment |
| M | molecular mass |
| NA | numerical aperture |
| n | number density |
| n | refractive index (Chapter 8) |
| NA | Avogadro number |
| P | polarization field |
| p | pressure |
 | volumetric flow rate |
| q | electric charge |
| R | fluidic resistance (Section 4.5) |
| R | radius of curvature (Section 6.2.2) |
| r | distance between the two molecules (Section 2.1.1) |
| r | interface position between two streams (Section 2.1.2.2) |
| r | pressure ratio (Section 5.5) |
| r | production rate of the species per volume (Section 2.1.2.4) |
| r | radial variable, radius |
| T | absolute temperature |
| T | surface tension of a thin membrane (Section 7.7.1) |
| t | time |
 | mean velocity |
| u, v,w | velocity components |
| v | velocity vector |
| x, y, z | spatial variables |
| z | ionic charge (Section 2.2.3.3) |
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