Marangoni effect

The Marangoni effect (also called the Gibbs–Marangoni effect) is the mass transfer along an interface between two fluids due to a gradient of the surface tension. In the case of temperature dependence, this phenomenon may be called thermo-capillary convection[1] (or Bénard–Marangoni convection).[2]

History

This phenomenon was first identified in the so-called "tears of wine" by physicist James Thomson (Lord Kelvin's brother) in 1855.[3] The general effect is named after Italian physicist Carlo Marangoni, who studied it for his doctoral dissertation at the University of Pavia and published his results in 1865.[4] A complete theoretical treatment of the subject was given by J. Willard Gibbs in his work On the Equilibrium of Heterogeneous Substances (1875-8).[5]

Mechanism

Since a liquid with a high surface tension pulls more strongly on the surrounding liquid than one with a low surface tension, the presence of a gradient in surface tension will naturally cause the liquid to flow away from regions of low surface tension. The surface tension gradient can be caused by concentration gradient or by a temperature gradient (surface tension is a function of temperature).

As an example, wine may exhibit a visible effect called "tears", as shown in the photograph. The effect is a consequence of the fact that alcohol has a lower surface tension and higher volatility than water. The water/alcohol solution rises up the surface of the glass due to capillary action. Alcohol evaporates from the film leaving behind liquid with a higher surface tension (more water, less alcohol). This region with a lower concentration of alcohol (greater surface tension) pulls on the surrounding fluid more strongly than the regions with a higher alcohol concentration (lower in the glass). The result is the liquid is pulled up until its own weight exceeds the force of the effect, and the liquid drips back down the vessel's walls. This can also be easily demonstrated by spreading a thin film of water on a smooth surface and then allowing a drop of alcohol to fall on the center of the film. The liquid will rush out of the region where the drop of alcohol fell.

The Marangoni number, a dimensionless value, can be used to characterize the relative effects of surface tension and viscous forces.

A very detailed mathematical treatment of this from the point of view of the Navier–Stokes equations and the equations of thermodynamics can be found in the first third of Subrahmanyan Chandrasekhar's Hydrodynamic and Hydromagnetic Stability[6] originally published in 1961 by Oxford, and republished by Dover in 1981.

Significance to transport phenomena

Under earth conditions, the effect of gravity causing natural convection in a system with a temperature gradient along a fluid/fluid interface is usually much stronger than the Marangoni effect. Many experiments (ESA MASER 1-3) have been conducted under microgravity conditions aboard sounding rockets to observe the Marangoni effect without the influence of gravity. Research on heat pipes performed on the International Space Station revealed that whilst heat pipes exposed to a temperature gradient on Earth cause the inner fluid to evaporate at one end and migrate along the pipe, thus drying the hot end, in space (where the effects of gravity can be ignored) the opposite happens and the hot end of the pipe is flooded with liquid.[7] This is due to the Marangoni effect, together with capillary action. The fluid is drawn to the hot end of the tube by capillary action. But the bulk of the liquid still ends up as a droplet a short distance away from the hottest part of the tube, explained by Marangoni flow. The temperature gradients in axial and radial directions makes the fluid flow away from the hot end and the walls of the tube, towards the center axis. The liquid forms a droplet with a small contact area with the tube walls, a thin film circulating liquid between the cooler droplet and the liquid at the hot end.

The effect of the Marangoni effect on heat transfer in the presence of gas bubbles on the heating surface (e.g., in subcooled nucleate boiling) has long been ignored, but it is currently a topic of ongoing research interest because of its potential fundamental importance to the understanding of heat transfer in boiling.[8]

Examples and application

A familiar example is in soap films: the Marangoni effect stabilizes soap films. Another instance of the Marangoni effect appears in the behavior of convection cells, the so-called Bénard cells.

One important application of the Marangoni effect is the use for drying silicon wafers after a wet processing step during the manufacture of integrated circuits. Liquid spots left on the wafer surface can cause oxidation that damages components on the wafer. To avoid spotting, an alcohol vapor (IPA) or other organic compound in gas, vapor, or aerosol form is blown through a nozzle over the wet wafer surface (or at the meniscus formed between the cleaning liquid and wafer as the wafer is lifted from an immersion bath), and the subsequent Marangoni effect causes a surface-tension gradient in the liquid allowing gravity more easily to pull the liquid completely off the wafer surface, effectively leaving a dry wafer surface.

A similar phenomenon has been creatively utilized to self-assemble nanoparticles into ordered arrays[9] and to grow ordered nanotubes.[10] An alcohol containing nanoparticles is spread on the substrate, followed by blowing the substrate with a humid air flow. The alcohol is evaporated under the flow. Simultaneously, water condenses and forms microdroplets on the substrate. Meanwhile, the nanoparticles in alcohol are transferred into the microdroplets and finally form numerous coffee rings on the substrate after drying.

The Marangoni effect is also important to the fields of welding, crystal growth and electron beam melting of metals.[1]

• Plateau–Rayleigh instability — an instability in a stream of liquid
• Diffusioosmosis - the Marangoni effect is flow at a fluid/fluid interface due to a gradient in the interfacial free energy, the analog at a fluid/solid interface is diffusioosmosis

References

1. "Marangoni Convection". COMSOL. Retrieved 2014-08-06.
2. Getling, A.V. (1998). Rayleigh-Bénard convection : structures and dynamics (Reprint. ed.). Singapore: World Scientific. ISBN 981-02-2657-8.
3. On certain curious Motions observable at the Surfaces of Wine and other Alcoholic Liquors. The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science. 1855. p. 330–333.
4. Sull'espansione delle goccie d'un liquido galleggianti sulla superficie di altro liquido [On the expansion of a droplet of a liquid floating on the surface of another liquid]. Pavia, Italy: Fratelli Fusi. 1869.
5. Josiah Willard Gibbs (1878) "On the equilibrium of heterogeneous substances. Part II," Transactions of the Connecticut Academy of Arts and Sciences, 3 : 343-524. The equation for the energy that's required to create a surface between two phases appears on page 483. Reprinted in: Josiah Willard Gibbs with Henry Andrews Bumstead and Ralph Gibbs van Name, ed.s, The Scientific Papers of J. Willard Gibbs, ..., vol. 1, (New York, New York: Longmans, Green and Co., 1906), page 315.
6. Chandrasekhar, S. (1981). Hydrodynamic and hydromagnetic stability ([Dover ed.]. ed.). New York: Dover. ISBN 978-0486640716.
7. Kundan, Akshay; Plawsky, Joel L.; Wayner, Peter C.; Chao, David F.; Sicker, Ronald J.; Motil, Brian J.; Lorik, Tibor; Chestney, Louis; Eustace, John; Zoldak, John (2015). "Thermocapillary Phenomena and Performance Limitations of a Wickless Heat Pipe in Microgravity". Physical Review Letters. 114 (14): 146105. Bibcode:2015PhRvL.114n6105K. doi:10.1103/PhysRevLett.114.146105. PMID 25910141.
8. Petrovic, Sanja; Robinson, Tony; Judd, Ross L. (November 2004). "Marangoni heat transfer in subcooled nucleate pool boiling". International Journal of Heat and Mass Transfer. 47 (23): 5115–5128. doi:10.1016/j.ijheatmasstransfer.2004.05.031.
9. Cai, Yangjun; Zhang Newby, Bi-min (May 2008). "Marangoni Flow-Induced Self-Assembly of Hexagonal and Stripelike Nanoparticle Patterns". Journal of the American Chemical Society. 130 (19): 6076–6077. doi:10.1021/ja801438u. PMID 18426208.
10. Lee, Wei Cheat; Fang, Yuanxing; Kler, Rantej; Canciani, Giacomo E.; Draper, Thomas C.; Al-Abdullah, Zainab T.Y.; Alfadul, Sulaiman M.; Perry, Christopher C.; He, Heyong (2015). "Marangoni ring-templated vertically aligned ZnO nanotube arrays with enhanced photocatalytic hydrogen production". Materials Chemistry and Physics. 149-150: 12–16. doi:10.1016/j.matchemphys.2014.10.046.