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Related Concept Videos

Viscosity01:17

Viscosity

When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...

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Related Experiment Video

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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
10:09

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

Impact of a viscous liquid drop.

Robert D Schroll1, Christophe Josserand, Stéphane Zaleski

  • 1Physics Department and the James Franck Institute, The University of Chicago, 929 East 57th Street, Chicago, Illinois 60637, USA.

Physical Review Letters
|April 7, 2010
PubMed
Summary

We simulated liquid drop impact on a dry surface, finding it forms a flat "pancake" shape without splashing. The final thickness is determined by where the drop

Area of Science:

  • Fluid dynamics
  • Surface science
  • Computational physics

Background:

  • Liquid drop impact dynamics are crucial in various industrial processes.
  • Understanding splash and no-splash regimes is key to controlling deposition and wetting.
  • Previous studies often simplified boundary conditions or neglected surface tension effects.

Purpose of the Study:

  • To simulate the impact of a viscous liquid drop on a smooth, dry solid surface.
  • To investigate the physical mechanisms governing drop deformation and spreading without splashing.
  • To determine the factors controlling the final shape and thickness of the impacted drop.

Main Methods:

  • Numerical simulation of fluid flow.
  • Incorporation of a no-slip boundary condition at the solid-liquid interface.

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  • Modeling of surface tension effects at the liquid rim.

    • Main Results:

    • Simulations replicate experimental observations of non-splashing impacts.
    • The drop flattens into a uniform thickness 'pancake' shape.
    • The final pancake thickness is dictated by the initial collision height of the drop surface with the boundary layer.

    Conclusions:

    • The no-slip boundary condition is essential for accurately simulating non-splashing drop impacts.
    • Surface tension plays a significant role in defining the rim of the flattened drop.
    • The simulation provides a predictive model for drop impact outcomes based on fluid properties and impact conditions.