Reynoldsgetal

Die Reynoldsgetal is 'n dimensielose getal wat 'n aanduiding van turbulensie is.

${\displaystyle \mathrm {Re} ={{\rho ud} \over {\mu }}}$

Waar:

${\displaystyle \rho }$ = digtheid in kg/m³

${\displaystyle u}$ = snelheid van die vloeier in die pyp in [m/s]

${\displaystyle d}$ = binnediameter van die pyp in meter [m]

${\displaystyle \mu }$ = dinamiese viskositeit in [Pa.s] of [N.s/m²] of [kg/(ms)]. Die viskosteit van water by 21 °C is 1 cP of 0.001 Pa.s

In terme van eenheidsimbole:

${\displaystyle {\frac {{\frac {kg}{m^{3}}}\cdot {\frac {m}{s}}\times m}{\frac {kg}{m\cdot s}}}={\frac {kg}{m^{3}}}\cdot {\frac {m}{s}}\times {\frac {m}{1}}\times {\frac {m\cdot s}{kg}}=1}$