capillary head - Glossary of Meteorology
(Also called capillary pressure head.) The potential, expressed in units of water head, due to the capillarity of a porous medium in the presence of a wetted liquid.
An approach for quick estimation of maximum height of capillary rise ...
Dec 1, 2014 · The driving head of capillary rise is assumed to be the hydraulic gradient between the wetting front and maximum height of capillary rise. It can be written as follows: (4) i = h c − z z where, hc is the maximum height of capillary rise and …
Capillary rise is one of the most well-known and vivid illustrations of capillarity. It is exploited in a number of biological processes, including drinking strategies of insects, birds and bats and plays an important role in a number of geophysical settings, including flow in porous media such as soil or …
Capillary Pressure - SpringerLink
Jan 1, 2016 · Capillary force equilibrium at an interface between two immiscible fluids. By definition, the capillary pressure is always a positive (or zero) quantity. The capillary pressure is often expressed as an equivalent water height, denoted h c and called capillary‐pressure head.
The soil moisture velocity equation - Ogden - 2017 - Journal of ...
May 23, 2017 · The soil water constitutive relations given in equation 9 result in the following water retention relationship, with h defined as the capillary head (negative for water under tension): (10) When the capillary head h ≥ 0, the soil is …
extremely low magnitude of air permeability and capillary head with respect to total fluid saturation for fingered flow during air sparging is likely to have a significant impact on the nature of field-scale air sparging and related mathematical modeling.
The elevation head, z, is determined at each point by the elevation of that point relative to a certain reference level ( z being positive above the reference level and negative below it – see Fig. 4.3).
The elliptic nature of the solution can arise when capillary head is the primary variable, which is common in simulations of layered soils because capillary head is the continuous variable while water content is discontinuous across layers [List and Radu, 2016].
Numerical Solution of Richards' Equation: A Review of …
Oct 19, 2017 · Richards' equation can be written in a number of forms, namely the water content, mixed water content and capillary head form, and the head form. In one-dimension, the so-called “mixed water content form”, because it mixes the water content θ with the capillary head ψ (θ), is:
The WRC describes the rela-tionship between the soil capillary head, y, and the volumetric water content, q, or the effective saturation degree, Se, defined as Se = (q qr)/(qs qr) where qs and qr are the saturated and residual volumetric water contents, respectively.
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