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Area of Science:

  • Heat Transfer
  • Nanotechnology
  • Fluid Dynamics

Background:

  • High porosity nanostructured coatings enhance liquid-to-vapor phase change by wicking liquids laterally during boiling.
  • While critical heat flux is understood, the impact on heat transfer coefficient (boiling efficiency) is less clear.

Purpose of the Study:

  • To experimentally measure heat transfer beneath bubbles on nanostructured surfaces during the transient ebullition cycle.
  • To characterize surface superheat, heat flux, and heat transfer coefficient using IR thermography.
  • To elucidate the role of nanostructured coatings and thin-film evaporation in nucleate boiling.

Main Methods:

  • Utilized a novel experimental apparatus for heat transfer measurements.
  • Employed IR thermography to visualize and quantify thermal properties during bubble ebullition.
  • Independently tuned surface heat flux and bubble departure time to study transient effects.

Main Results:

  • Nanostructured coatings provide uniform temperature profiles, unlike flat surfaces with large variations.
  • Enhanced heat transfer observed due to evaporation from nanostructure-supported liquid films.
  • Demonstrated the importance of advancing/receding contact lines and quenching on thermal performance.

Conclusions:

  • Nanostructured coatings increase the average heat transfer coefficient by over 30%.
  • This work highlights the role of thin-film evaporation and contact line dynamics in nanostructured boiling.
  • Provides a framework for understanding nanostructured boiling across the entire boiling curve.