Darcy's law

Darcy's law

Darcy's law. Equation and notations

Darcy's law is the fundamental law of fluid motion in porous media published by Henry Darcy in 1856 .

Darcy's law has been successfully applied to determine the flow through permeable media since the early days of Petroleum Engineering.

The basic form of Darcy's law is very similar to in form to other physical laws. For example Fourier's law for heat conduction and Ohm's law for flow of electricity.

$q=\frac{kA}{\mu} \frac{\Delta P}{L}$

Darcy's law History

Henry Darcy worked on the design of a filter large enough to process the Dijon towns daily water requirement .

By flowing water through the sand pack Darcy established that, for any flow rate, the velocity of the flow was directly proportional to the difference in manometric heights:

Darcy's experimental equipment

Darcy's law Equation

$q = -\frac{kA}{\mu} \frac{dP}{dL}$

Conditions

• Single fluid
• Steady stay flow
• Constant fluid compressibility
• Constant temperature

Inflow Equations Derivation

Derivation of the Linear and Radial Inflow Equations

Nomenclature

$A$ = cross-sectional area, cm²

$k$ = permeability, d

$L$ = length, cm

$P$ = pressure, atm

$q$ = flow rate, cm³/sec

Greek symbols

$\mu$ = Darcy's law fluid viscosity, cp

See Also

Darcy's law application in Petroleum Engineering Technology.