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2. Washburn's equation - Wikipedia

   en.wikipedia.org/wiki/Washburn's_equation

   The equation is derived for capillary flow in a cylindrical tube in the absence of a gravitational field, but is sufficiently accurate in many cases when the capillary force is still significantly greater than the gravitational force. In his paper from 1921 Washburn applies Poiseuille's Law for fluid motion in a circular tube.

3. Capillary pressure - Wikipedia

   en.wikipedia.org/wiki/Capillary_pressure

   Capillary pressure can also be utilized to block fluid flow in a microfluidic device. A schematic of fluid flowing through a microfluidic device by capillary action (refer to image of capillary rise of water for left and right contact angles in microfluidic channels) The capillary pressure in a microchannel can be described as:

4. Jurin's law - Wikipedia

   en.wikipedia.org/wiki/Jurin's_Law

   For a water-filled glass tube in air at standard conditions for temperature and pressure, γ = 0.0728 N/m at 20 °C, ρ = 1000 kg/m 3, and g = 9.81 m/s 2. Because water spreads on clean glass, the effective equilibrium contact angle is approximately zero. [4] For these values, the height of the water column is

5. Young–Laplace equation - Wikipedia

   en.wikipedia.org/wiki/Young–Laplace_equation

   In physics, the Young–Laplace equation (/ l ə ˈ p l ɑː s /) is an algebraic equation that describes the capillary pressure difference sustained across the interface between two static fluids, such as water and air, due to the phenomenon of surface tension or wall tension, although use of the latter is only applicable if assuming that the wall is very thin.

6. Capillary action - Wikipedia

   en.wikipedia.org/wiki/Capillary_action

   Capillary action of water (polar) compared to mercury (non-polar), in each case with respect to a polar surface such as glass (≡Si–OH). Capillary action (sometimes called capillarity, capillary motion, capillary rise, capillary effect, or wicking) is the process of a liquid flowing in a narrow space without the assistance of external forces like gravity.

7. Darcy's law for multiphase flow - Wikipedia

   en.wikipedia.org/wiki/Darcy's_law_for_multiphase...

   Leverett also pointed out that the capillary pressure shows significant hysteresis effects. This means that the capillary pressure for a drainage process is different from the capillary pressure of an imbibition process with the same fluid phases. Hysteresis does not change the shape of the governing flow equation, but it increases (usually ...