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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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Retention Forces for Drops on Microstructured Superhydrophobic Surfaces.

Shaur Humayun1, R Daniel Maynes1, Julie Crockett1

  • 1Brigham Young University, Provo, Utah84602, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

Accurate models for retention forces on superhydrophobic (SH) surfaces improve predictions of drop dynamics and heat transfer. This study introduces improved methods for calculating these forces, enhancing prediction accuracy by 50%.

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Area of Science:

  • Surface Science
  • Fluid Dynamics
  • Heat Transfer

Background:

  • Accurate modeling of drop retention forces on superhydrophobic (SH) surfaces is crucial for predicting drop dynamics and heat transfer during dropwise condensation.
  • Existing models often fail for microstructured SH surfaces, necessitating new approaches that consider surface topography and wetting behavior.

Purpose of the Study:

  • To develop and validate accurate models for retention forces between drops and microstructured SH surfaces.
  • To investigate the influence of contact angle distribution and base area shape on retention forces.
  • To improve the prediction of drop dynamics and heat transfer on SH surfaces.

Main Methods:

  • Measurement of contact angle distribution and drop base area shapes for various drop sizes on inclined microstructured SH surfaces.
  • Approximation of base area shape using two ellipses and fitting contact angle distribution with a sigmoid function.
  • Calculation of retention forces using measured contact angles and base area shapes, validated against drop weight on tilted surfaces.

Main Results:

  • Drop base area shape was approximated by two ellipses; contact angle distribution was best fit by a sigmoid function.
  • Near roll-off angles, drop base areas were circular for high/low solid fractions but non-circular for intermediate fractions.
  • The proposed model, incorporating sigmoid contact angle distribution and modified base area, improved retention force calculations by 50% compared to previous methods.

Conclusions:

  • The study provides a more accurate method for calculating retention forces on microstructured SH surfaces by considering specific geometric and wetting properties.
  • The findings enhance the ability to predict drop behavior and optimize heat transfer in applications utilizing SH surfaces.
  • The developed model offers improved retention force factor values for surfaces with varying solid fractions.