single-rb.php

JRM Vol.23 No.3 pp. 386-392
doi: 10.20965/jrm.2011.p0386
(2011)

Paper:

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:
Tonau Nakai, Takahiro Ueno, Kenji Kanzawa, and
and Tomonobu Goto, “Temperature Dependence of the Lifetime of a Droplet on a Liquid Surface,” J. Robot. Mechatron., Vol.23, No.3, pp. 386-392, 2011.
Data files:
References
  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.

*This site is desgined based on HTML5 and CSS3 for modern browsers, e.g. Chrome, Firefox, Safari, Edge, Opera.

Last updated on Dec. 09, 2021