Fr.: équation de Navier-Stokes
One of a set of → differential equations that describes the motion of a → fluid as a function of → pressure, → density, total external force, and → viscosity. See also → Euler equation.
Named after Claude-Louis Navier (1785-1836), a French engineer and physicist, and George Gabriel Stokes, → stokes; → equation.
The unit of → viscosity in the → cgs system, cm2 s-1, equal to 10-4 m2 s-1.
After Sir George Gabriel Stokes (1819-1903), a British mathematician and physicist, who made important contributions to fluid dynamics, optics, and mathematical physics; → Stokes law; → Stokes parameter.
Stokes friction factor
karvand-e mâleš-e Stokes
Fr.: facteur de friction de Stokes
For the translational motion of a spherical body moving in a → viscous fluid, the proportionality factor between the uniform flow velocity far from the sphere and the drag force, provided no-slip boundary condition and small → Reynolds numbers: f = 6πηR, where η is the Reynolds number and R radius of the sphere.
qânun-e Stokes (#)
Fr.: loi de Stokes
1) Fluid mechanics: At low velocities, the frictional force on a
spherical body moving through a fluid at constant velocity is equal to
6πRηv, where R is the radius of the sphere,
η the fluid → viscosity, and v the velocity.
Fr.: paramètres de Stokes
Four parameters which are needed to fully describe the
→ polarization state of
→ electromagnetic radiation.
They involve the maximum and minimum intensity, the ellipticity,
and the direction of polarization.
The four Stokes parameters are traditionally defined as follows: