Tortuosity is a property of curve being tortuous (twisted; having many turns). There have been several attempts to quantify this property.
In 1957 John Philip introduced the term sorptivity and defined it as a measure of the capacity of the medium to absorb or desorb liquid by capillarity.
Heat flux (Advection)
Heat transfer describes the exchange of thermal energy, between physical systems depending on the temperature and pressure, by dissipating heat. The
Hartmann number (Ha) is the ratio of electromagnetic force to the viscous force first introduced by Hartmann.
In the design of fluid bearings, the Sommerfeld number (S), or bearing characteristic number, is a dimensionless quantity used extensively in hydrodynamic