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Physics of Fluids / Volume 24 / Issue 2 / ARTICLES / Interfacial Flows

Phys. Fluids 24, 022103 (2012); http://dx.doi.org/10.1063/1.3681810 (9 pages)

Observation of collision and oscillation of microdroplets with extremely large shear deformation

Tatsuya Yamada and Keiji Sakai

Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

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(Received 21 April 2011; accepted 10 January 2012; published online 8 February 2012)

We measured the viscosity and surface tension of various liquids under large (∼106 s−1) shear deformation. Oscillation of a 10-μm size microdroplet is brought about by the head-on collision of two droplets. Since the Reynolds number is as small as 100, the motion of the liquid is stable and the dynamic image is obtained with high reproducibility by the stroboscopic method. By observing and evaluating the mechanical oscillation of the microdroplet, of which frequency ranges typically in 100 – 300 kHz, we found that the viscosity of ethylene glycol and diethylene glycol is smaller than the known literature value, which is considered to be the viscosity at zero-frequency. This phenomena can be attributed to the slow viscous relaxation of associated liquids due to the re-combination dynamics of the network of H-bonds.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
  3. EXPERIMENT
  4. RESULTS AND DISCUSSION
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

drops, flow visualisation, fluid oscillations, laminar flow, liquid structure, organic compounds, shear deformation, surface tension measurement, viscosity, viscosity measurement

PACS

  • 47.55.D-

    Drops and bubbles

  • 61.20.Qg

    Structure of associated liquids: electrolytes, molten salts, etc.

  • 68.03.Cd

    Surface tension and related phenomena

  • 66.20.Ej

    Studies of viscosity and rheological properties of specific liquids

  • 62.10.+s

    Mechanical properties of liquids

  • 47.80.Jk

    Flow visualization and imaging

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3681810

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    W. K. Rhim, K. Ohasaka, P. F. Paradis, and R. E. Spjut, “Noncontact technique for measuring surface tension and viscosity of molten materials using high temperature electrostatic levitation,” Rev. Sci. Instrum. 70, 2796 (1999)RSINAK000070000006002796000001.

    T. Yamada, N. Sasagawa, and K. Sakai, “Accurate determination of volume and evaporation rate of micron-size liquid particle,” J. Appl. Phys. 108, 063523 (2010)JAPIAU000108000006063523000001.

    K. Sakai, K. Omata, and K. Takagi, “Direct observation of slow molecular relaxation by high resolution light scattering spectroscopy,” J. Chem. Phys. 122, 024503 (2005)JCPSA6000122000002024503000001.

    B. V. Derjaguin, U. B. Bazaron, K. D. Lamazhapova, and B. D. Tsidypov, “Shear elasticity of low-viscosity liquids at low frequencies,” Phys. Rev. A 42, 2255 (1990).

    M. A. Herrada, J. M. Montanero, and J. M. Vega, “The effect of surface shear viscosity on the damping of oscillations in millimetric liquid bridges,” Phys. Fluids 23, 082102 (2011)PHFLE6000023000008082102000001.


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