Capillary action (sometimes capillarity, capillary motion, or wicking) is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to, external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper, in some non-porous materials such as liquified carbon fiber, or in a cell. It occurs because of intermolecular forces between the liquid and surrounding solid surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (which is caused by cohesion within the liquid) and adhesive forces between the liquid and container act to lift the liquid. In short, the capillary action is due to the pressure of cohesion and adhesion which cause the liquid to work against gravity.
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The first recorded observation of capillary action was by Leonardo da Vinci. In 1660, capillary action was still a novelty to the Irish chemist Robert Boyle, when he reported that "some inquisitive French Men" had observed that when a capillary tube was dipped into water, the water would ascend to "some height in the Pipe". Boyle then reported an experiment in which he dipped a capillary tube into red wine and then subjected the tube to a partial vacuum. He found that the vacuum had no observable influence on the height of the liquid in the capillary, so the behavior of liquids in capillary tubes was due to some phenomenon different from that which governed mercury barometers.
Others soon followed Boyle's lead. Some (e.g., Honoré Fabri, Jacob Bernoulli) thought that liquids rose in capillaries because air couldn't enter capillaries as easily as liquids, so the air pressure was lower inside capillaries. Others (e.g., Isaac Vossius, Giovanni Alfonso Borelli, Louis Carré, Francis Hauksbee, Josia Weitbrecht,) thought that the particles of liquid were attracted to each other and to the walls of the capillary.
Phenomena and physics of capillary action
A common apparatus used to demonstrate the first phenomenon is the capillary tube. When the lower end of a vertical glass tube is placed in a liquid, such as water, a concave meniscus forms. Adhesion occurs between the fluid and the solid inner wall pulling the liquid column up until there is a sufficient mass of liquid for gravitational forces to overcome these intermolecular forces. The contact length (around the edge) between the top of the liquid column and the tube is proportional to the diameter of the tube, while the weight of the liquid column is proportional to the square of the tube's diameter. So, a narrow tube will draw a liquid column higher than a wider tube will.
In plants and trees
The capillary action is enhanced in trees by branching, evaporation at the leaves creating depressurization, and probably by osmotic pressure added at the roots and possibly at other locations inside the plant, especially when gathering humidity with air roots.
Capillary action is essential for the drainage of constantly produced tear fluid from the eye. Two canaliculi of tiny diameter are present in the inner corner of the eyelid, also called the lacrimal ducts; their openings can be seen with the naked eye within the lacrymal sacs when the eyelids are everted.
Wicking is the absorption of a liquid by a material in the manner of a candle wick. Paper towels absorb liquid through capillary action, allowing a fluid to be transferred from a surface to the towel. The small pores of a sponge act as small capillaries, causing it to absorb a comparatively large amount of fluid. Some textile fabrics are said to use capillary action to "wick" sweat away from the skin. These are often referred to as wicking fabrics, after the capillary properties of candle and lamp wicks.
Capillary action is observed in thin layer chromatography, in which a solvent moves vertically up a plate via capillary action. In this case the pores are gaps between very small particles.
With some pairs of materials, such as mercury and glass, the intermolecular forces within the liquid exceed those between the solid and the liquid, so a convex meniscus forms and capillary action works in reverse.
In hydrology, capillary action describes the attraction of water molecules to soil particles. Capillary action is responsible for moving groundwater from wet areas of the soil to dry areas. Differences in soil potential () drive capillary action in soil.
Height of a meniscus
The height h of a liquid column is given by:
where is the liquid-air surface tension (force/unit length), θ is the contact angle, ρ is the density of liquid (mass/volume), g is local acceleration due to gravity (length/square of time), and r is radius of tube (length). Thus the thinner the space in which the water can travel, the further up it goes.
For a water-filled glass tube in air at standard laboratory conditions, γ = 0.0728 N/m at 20 °C, θ = 0° (cos(0) = 1), ρ is 1000 kg/m3, and g = 9.81 m/s2. For these values, the height of the water column is
Thus for a 4 m (13 ft) diameter glass tube in lab conditions given above (radius 2 m (6.6 ft)), the water would rise an unnoticeable 0.007 mm (0.00028 in). However, for a 4 cm (1.6 in) diameter tube (radius 2 cm (0.79 in)), the water would rise 0.7 mm (0.028 in), and for a 0.4 mm (0.016 in) diameter tube (radius 0.2 mm (0.0079 in)), the water would rise 70 mm (2.8 in).
Liquid transport in porous media
When a dry porous medium, such as a brick or a wick, is brought into contact with a liquid, it will start absorbing the liquid at a rate which decreases over time. For a bar of material with cross-sectional area A that is wetted on one end, the cumulative volume V of absorbed liquid after a time t is
where S is the sorptivity of the medium, with dimensions m/s1/2 or mm/min1/2. The quantity
is called the cumulative liquid intake, with the dimension of length. The wetted length of the bar, that is the distance between the wetted end of the bar and the so-called wet front, is dependent on the fraction f of the volume occupied by liquid. This number f is the porosity of the medium; the wetted length is then
Some authors use the quantity S/f as the sorptivity. The above description is for the case where gravity and evaporation do not play a role.
Sorptivity is a relevant property of building materials, because it affects the amount of rising dampness. Some values for the sorptivity of building materials are in the table below.
- Bound water
- Capillary fringe
- Capillary pressure
- Capillary wave
- Damp-proof course
- Frost flowers
- Frost heaving
- Hindu milk miracle
- Needle ice
- Surface tension
- Washburn's equation
- Wick effect
- Young–Laplace equation
|Wikimedia Commons has media related to Capillary action.|
- "Capillary Action - Liquid, Water, Force, and Surface - JRank Articles". Science.jrank.org. Retrieved 2013-06-18.
- Manuscripts of Léonardo de Vinci (Paris) , vol. N, folios 11, 67, and 74.
- Guillaume Libri, Histoire des sciences mathématiques en Italie, depuis la Renaissance des lettres jusqu'a la fin du dix-septième siecle [History of the mathematical sciences in Italy, from the Renaissance until the seventeenth century] (Paris, France: Jules Renouard et cie., 1840), vol. 3, page 54. From page 54: "Enfin, deux observations capitales, celle de l'action capillaire (7) et celle de la diffraction (8), dont jusqu'à présent on avait méconnu le véritable auteur, sont dues également à ce brillant génie." (Finally, two major observations, that of capillary action (7) and that of diffraction (8), the true author of which until now had not been recognized, are also due to this brilliant genius.)
- C. Wolf (1857) "Vom Einfluss der Temperatur auf die Erscheinungen in Haarröhrchen" (On the influence of temperature on phenomena in capillary tubes) Annalen der Physik und Chemie, 101 (177) : 550-576 ; see footnote on page 551 by editor Johann C. Poggendorff. From page 551: " … nach Libri (Hist. des sciences math. en Italie, T. III, p. 54) in den zu Paris aufbewahrten Handschriften des grossen Künstlers Leonardo da Vinci (gestorben 1519) schon Beobachtungen dieser Art vorfinden; … " ( … according to Libri (History of the mathematical sciences in Italy, vol. 3, p. 54) observations of this kind [i.e., of capillary action] are already to be found in the manuscripts of the great artist Leonardo da Vinci (died 1519), which are preserved in Paris; … )
- More detailed histories of research on capillary action can be found in:
- David Brewster, ed., Edinburgh Encyclopaedia (Philadelphia, Pennsylvania: Joseph and Edward Parker, 1832), volume 10, pp. 805-823.
- The 1911 Encyclopædia Britannica, volume 5, article: "Capillary action". Available at: Wikisource.org .
- John Uri Lloyd (1902) "References to capillarity to the end of the year 1900," Bulletin of the Lloyd Library and Museum of Botany, Pharmacy and Materia Medica, 1 (4) : 99-204.
- Robert Boyle, New Experiments Physico-Mechanical touching the Spring of the Air, … (Oxford, England: H. Hall, 1660), pp. 265-270. Available on-line at: Echo (Max Planck Institute for the History of Science; Berlin, Germany).
- See, for example:
- Robert Hooke (1661) An attempt for the explication of the Phenomena observable in an experiment published by the Right Hon. Robert Boyle, in the 35th experiment of his Epistolical Discourse touching the Air, in confirmation of a former conjecture made by R. Hooke. [pamphlet].
- Hooke's An attempt for the explication … was reprinted (with some changes) in: Robert Hooke, Micrographia … (London, England: James Allestry, 1667), pp. 12-22, "Observ. IV. Of small Glass Canes."
- Geminiano Montanari, Pensieri fisico-matematici sopra alcune esperienze fatte in Bologna … [Physical-mathematical ideas about some experiments done in Bologna … ] (Bologna, (Italy): 1667).
- George Sinclair, Ars Nova et Magna Gravitatis et Levitatis [New and great powers of weight and levity] (Rotterdam, Netherlands: Arnold Leers, Jr., 1669).
- Johannes Christoph Sturm, Collegium Experimentale sive Curiosum [Catalog of experiments, or Curiosity] (Nüremberg (Norimbergæ), (Germany): Wolfgang Moritz Endter & the heirs of Johann Andreas Endter, 1676). See: "Tentamen VIII. Canaliculorum angustiorum recens-notata Phænomena, … " (Experiment 8. Recently noted phenomena of narrow capillaries, … ), pp. 44-48.
- Honorato Fabri, Dialogi physici … ((Lyon (Lugdunum), France: 1665), pages 157 ff "Dialogus Quartus. In quo, de libratis suspensisque liquoribus & Mercurio disputatur. (Dialogue four. In which the balance and suspension of liquids and mercury is discussed).
- Honorato Fabri, Dialogi physici … ((Lyon (Lugdunum), France: Antoine Molin, 1669), pages 267 ff "Alithophilus, Dialogus quartus, in quo nonnulla discutiuntur à D. Montanario opposita circa elevationem Humoris in canaliculis, etc." (Alithophilus, Fourth dialogue, in which Dr. Montanari's opposition regarding the elevation of liquids in capillaries is utterly refuted).
- Jacob Bernoulli, Dissertatio de Gravitate Ætheris (Amsterdam, Netherlands: Hendrik Wetsten, 1683).
- Isaac Vossius, De Nili et Aliorum Fluminum Origine [On the sources of the Nile and other rivers] (Hague (Hagæ Comitis), Netherlands: Adrian Vlacq, 1666), pages 3-7 (chapter 2).
- Borelli, Giovanni Alfonso De motionibus naturalibus a gravitate pendentibus (Lyon, France: 1670), page 385, Cap. 8 Prop. CLXXXV (Chapter 8, Proposition 185.). Available on-line at: Echo (Max Planck Institute for the History of Science; Berlin, Germany).
- Carré (1705) "Experiences sur les tuyaux Capillaires" (Experiments on capillary tubes), Mémoires de l'Académie Royale des Sciences, pp. 241-254.
- Francis Hauksbee (1708) "Several Experiments Touching the Seeming Spontaneous Ascent of Water," Philosophical Transactions of the Royal Society of London, 26 : 258-266.
- Francis Hauksbee, Physico-mechanical Experiments on Various Subjects … (London, England: (Self-published), 1709), pages 139–169.
- Francis Hauksbee (1711) "An account of an experiment touching the direction of a drop of oil of oranges, between two glass planes, towards any side of them that is nearest press'd together," Philosophical Transactions of the Royal Society of London, 27 : 374–375.
- Francis Hauksbee (1712) "An account of an experiment touching the ascent of water between two glass planes, in an hyperbolick figure," Philosophical Transactions of the Royal Society of London, 27 : 539–540.
- Josia Weitbrecht (1736) "Tentamen theoriae qua ascensus aquae in tubis capillaribus explicatur" (Theoretical essay in which the ascent of water in capillary tubes is explained), Commentarii academiae scientiarum imperialis Petropolitanae (Memoirs of the imperial academy of sciences in St. Petersburg), 8 : 261-309.
- Josia Weitbrecht (1737) "Explicatio difficilium experimentorum circa ascensum aquae in tubis capillaribus" (Explanation of difficult experiments concerning the ascent of water in capillary tubes), Commentarii academiae scientiarum imperialis Petropolitanae (Memoirs of the imperial academy of sciences in St. Petersburg), 9 : 275-309.
- Albert Einstein (1901) "Folgerungen aus den Capillaritätserscheinungen" (Conclusions [drawn] from capillary phenomena), Annalen der Physik, 309 (3) : 513-523.
- Hans-Josef Kuepper. "List of Scientific Publications of Albert Einstein". Einstein-website.de. Retrieved 2013-06-18.
- Tree physics at "Neat, Plausible And" scientific discussion website.
- Water in Redwood and other trees, mostly by evaporation article at wonderquest website.
- G.K. Batchelor, 'An Introduction To Fluid Dynamics', Cambridge University Press (1967) ISBN 0-521-66396-2, page 67 on Google Books
- Hsai-Yang Fang, john L. Daniels, Introductory Geotechnical Engineering: An Environmental Perspective
- C. Hall, W.D. Hoff, Water transport in brick, stone, and concrete. (2002) page 131 on Google books
- Hall and Hoff, p. 122