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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

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Heat exchange between a bouncing drop and a superhydrophobic substrate.

Samira Shiri1, James C Bird2

  • 1Department of Mechanical Engineering, Boston University, Boston, MA 02215.

Proceedings of the National Academy of Sciences of the United States of America
|June 21, 2017
PubMed
Summary

Heat transfer is significantly reduced when water drops bounce off superhydrophobic surfaces compared to when they stick. This finding is crucial for applications involving thermal management and fluid dynamics.

Keywords:
dropletsfeathersheat transfermicrotexturewetting

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Heat transfer

Background:

  • Controlling heat transfer between surfaces and impacting drops is vital for industrial spray cooling and biological thermal regulation.
  • Micro/nanotextured superhydrophobic surfaces facilitate drop bouncing due to trapped air, potentially limiting heat exchange.

Purpose of the Study:

  • To quantify heat transfer differences between bouncing and sticking drops on superhydrophobic surfaces.
  • To identify key parameters governing heat transfer in drop-surface interactions on superhydrophobic materials.

Main Methods:

  • Experimental investigation of millimeter-sized water drop impact and heat exchange on superhydrophobic surfaces.
  • Theoretical modeling to analyze the heat transfer mechanisms and influencing factors.

Main Results:

  • Heat exchanged is orders of magnitude lower when drops bounce compared to when they stick.
  • Heat transfer is independent of the trapped gas layer on superhydrophobic surfaces.
  • A small fraction of heat transferred is governed by two dimensionless parameter groups: one for thermal properties and another for dynamic characteristics.

Conclusions:

  • Drop bouncing on superhydrophobic surfaces drastically reduces heat transfer.
  • The thermal dynamics of the drop and substrate, along with capillary and inertial forces, dictate heat transfer efficiency.