Temperature Dependence of the Lifetime of a Droplet on a Liquid Surface

Tonau Nakai; Takahiro Ueno; Kenji Kanzawa; Tomonobu Goto

doi:10.20965/jrm.2011.p0386

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JRM Vol.23 No.3 pp. 386-392

doi: 10.20965/jrm.2011.p0386

(2011)

Paper:

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Temperature Dependence of the Lifetime of a Droplet on a Liquid Surface

Tonau Nakai, Takahiro Ueno, Kenji Kanzawa,
and Tomonobu Goto

Department of Mechanical and Aerospace Engineering, Graduate School of Engineering, Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan

Received:

September 30, 2010

Accepted:

April 1, 2011

Published:

June 20, 2011

Keywords:

droplet, liquid surface, temperature, coalescence, air film

Abstract

When a liquid is dropped onto a surface of the same liquid, the droplet often remains floating on the surface for a while because of the thin air film between the droplet and the surface. We find that the time during which this phenomenon is sustained depends on the temperature of the droplet and surface. In our experiment using silicone oil at a temperature range of 20-150°C, the lifetime of a droplet was found to be longer when the temperature difference between the droplet and surface was larger at the moment of the droplet’s landing. The lifetime was longer for a cold droplet on a hot surface than the opposite case, with the same temperature difference. Time-series measurements of the temperature of the floating droplet revealed that it coalesces with the liquid surface at a certain threshold temperature difference. These results indicate that the lifetime of a droplet is determined by the time it takes the temperature difference to decrease to the threshold.

Cite this article as:

T. Nakai, T. Ueno, K. Kanzawa, and T. Goto, “Temperature Dependence of the Lifetime of a Droplet on a Liquid Surface,” J. Robot. Mechatron., Vol.23 No.3, pp. 386-392, 2011.

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References

[1] L. Rayleigh, “Investigations in Capillarity,” Philos. Mag., Vol.48, pp. 321-337, 1899.
[2] Y. Couder et al., “From Bouncing to Floating: Noncoalescence of Drops on a Fluid Bath,” Phys. Rev. Lett., Vol.94, p. 177801, 2005.
[3] K. R. Sreenivas et al., “Levitation of a Drop over a Film Flow,” J. Fluid Mech., Vol.380, pp. 297-307, 1999.
[4] Y. Amarouchene et al., “Noncoalescing drops,” Phys. Rev. Lett., Vol.87, p. 206104, 2001.
[5] R. Monti and P. Dell’Aversana, “Microgravity experimentation in non coalescing systems,” Micrograv. Q., Vol.4, pp. 123-133, 1994.
[6] P. Dell’Aversana, V. Tontodonato, and L. Carotenuto, “Suppression of coalescence and of wetting: The shape of the interstitial film,” Phys. Fluids, Vol.9, pp. 2475-2485, 1997.
[7] R. Savino, D. Paterna, andM. Lappa, “Marangoni flotation of liquid droplets,” J. Fluid Mech., Vol.479, pp. 307-326, 2003.
[8] P. Dell’Aversana, J. R. Banavar, and J. Koplik, “Suppression of coalescence by shear and temperature gradients,” Phys. Fluids, Vol.8, pp.15-28, 1996.
[9] L. B. S. Sumner, A. M. Wood, and G. P. Neitzel, “Lubrication analysis of thermocapillary-induced nonwetting,” Phys. Fluids, Vol.15, pp. 2923-2933, 2003.

This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.

[1] [1] L. Rayleigh, “Investigations in Capillarity,” Philos. Mag., Vol.48, pp. 321-337, 1899.

[2] [2] Y. Couder et al., “From Bouncing to Floating: Noncoalescence of Drops on a Fluid Bath,” Phys. Rev. Lett., Vol.94, p. 177801, 2005.

[3] [3] K. R. Sreenivas et al., “Levitation of a Drop over a Film Flow,” J. Fluid Mech., Vol.380, pp. 297-307, 1999.

[4] [4] Y. Amarouchene et al., “Noncoalescing drops,” Phys. Rev. Lett., Vol.87, p. 206104, 2001.

[5] [5] R. Monti and P. Dell’Aversana, “Microgravity experimentation in non coalescing systems,” Micrograv. Q., Vol.4, pp. 123-133, 1994.

[6] [6] P. Dell’Aversana, V. Tontodonato, and L. Carotenuto, “Suppression of coalescence and of wetting: The shape of the interstitial film,” Phys. Fluids, Vol.9, pp. 2475-2485, 1997.

[7] [7] R. Savino, D. Paterna, andM. Lappa, “Marangoni flotation of liquid droplets,” J. Fluid Mech., Vol.479, pp. 307-326, 2003.

[8] [8] P. Dell’Aversana, J. R. Banavar, and J. Koplik, “Suppression of coalescence by shear and temperature gradients,” Phys. Fluids, Vol.8, pp.15-28, 1996.

[9] [9] L. B. S. Sumner, A. M. Wood, and G. P. Neitzel, “Lubrication analysis of thermocapillary-induced nonwetting,” Phys. Fluids, Vol.15, pp. 2923-2933, 2003.

Temperature Dependence of the Lifetime of a Droplet on a Liquid Surface

Tonau Nakai, Takahiro Ueno, Kenji Kanzawa, and Tomonobu Goto

Tonau Nakai, Takahiro Ueno, Kenji Kanzawa,
and Tomonobu Goto