criterion of similarity
Froude number
dimensionless number defined as the ratio of the flow inertia to the external field
Schmidt number
for a fluid, quotient of kinematic viscosity and diffusion coefficient
Ekman number
dimensionless ratio of viscous to Coriolis forces
Ericksen number
dimensionless number used to describe the deformation of the director field of liquid crystals
Rayleigh number
characteristic number of heat transport in fluids
Brinkman number
characteristic number of a fluid for the relation between heat produced by viscosity and heat received from outside by conduction
Clausius number
characteristic number of a fluid for the relation between energy transfer by momentum and by thermal conduction
Laplace number
characteristic number in fluid dynamics
Bodenstein number
ratio of the amount of substance introduced by convection to that introduced by diffusion
Dean number
characteristic number of flows in curved pipes
Bond number
characteristic number in fluid dynamics
Morton number
characteristic number for bubbles or drops in a liquid or gas, respectively, under the influence of gravitational an viscous forces
implied volatility
financial mathematical measure
Taylor number
characteristic number of a shaft rotating in a fluid
Rouse number
non-dimensional number in fluid dynamics
Jakob number
dimensionless number in thermodynamics
Fourier number for heat transfer
characteristic number for heat transfer into a body
Graetz number for heat transfer
characteristic number for the relation between heat transfer by convection and conduction in a laminar flow in a pipe
Hagen number
dimensionless number used in forced flow calculations
Atwood number
scaled density difference of two fluids
Lewis number
quotient of thermal diffusivity and diffusion coefficient for a fluid
Deborah number
quotient of relaxation time and observation time of viscoelastic fluids
power number
characteristic number for the power of an agitator
Stokes number
characteristic number for particles in a fluid or plasma
Mach number
ratio of speed of object moving through fluid and speed of sound
Archimedes number
used to determine the motion of fluids due to density differences
capillary number
ratio of viscous drag forces to surface tension in fluids
Biot number for heat transfer
characteristic number for heat transfer by conduction into a body
Sherwood number
in engineering
Eckert number
characteristic number of a fluid for the relation between kinetic energy and enthalpy change
Cauchy number
characteristic number in continuum mechanics used in the study of compressible flows
Lundquist number
quotient of Alfvén and magneto-dynamic speed in a plasma
Abbe number
material dispersion property
Knudsen number
quotient of the mean free path of a particle and a characteristic length
Stanton number for heat transfer
characteristic number for the relation between heat transfer though a surface into a fluid to heat transfer by convection
Richardson number
characteristic number of a falling body proportional to the quotient of potential and kinetic energy
magnetic Reynolds number
characteristic number of an electrically conducting fluid
Weber number
dimensionless number in fluid mechanics that is often useful in analysing fluid flows where there is an interface between two different fluids
Bulk Richardson number
dimensionless number
Colburn number
characteristic number for the relation between heat and mass transfer in a fluid
Hartmann number
characteristic number for electrically conducting fluids
Cowling number
characteristic number for the relation of magnetic to kinematic energy in a plasma