D

LKn CA 1

L KnCnA D

Ratio of inertial forces to viscous forces; Ratio of momentum transfer by convection and by molecular action of viscosity

Ratio of convective transport to molecular transport (of energy or mass)

Ratio of momentum diffusivity to thermal diffusivity Ratio of momentum diffusivity to mass diffusivity

Ratio of total transfer to molecular transfer (of energy or mass)

Ratio of convective time scale to reaction time scale; ratio of convective transport to rate of generation due to chemical reaction

Ratio of diffusion time scale to reaction time scale; ratio of diffusive transport to rate of generation due to chemical reaction

Ratio of interface transport to bulk transport Ratio of pressure forces to inertial forces

Ratio of inertial forces to gravitational forces

Ratio of thermal diffusivity to mass diffusivity

Ratio of inertial to surface forces

For more discussion on dimensionless numbers relevant for flow process, see Bird et al. (1960) and Brodkey and Hershey (1988).

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