Pressure difference (in flow direction) established by friction in fluid flow.

∆p_R

For laminar flow, with R_V = const.:

  IV = ∆p_R / R_V

For turbulent flow

  IV = k·SQRT(∆p_R)

[∆p_R] = Pa

resistive characterisitc (hydraulic)

widerstandsbedingte Druckdifferenz