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Thermal Marangoni bubbles.

Saurabh Nath1, Guillaume Ricard1, Panlin Jin1

  • 1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, ESPCI, 75005 Paris, France.

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Summary
This summary is machine-generated.

Hot oil surfaces can sustain air bubbles for extended periods, unlike pure water. This stability arises from temperature gradients that create upward flows, preventing bubble collapse and demonstrating persistent oil film dynamics.

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Area of Science:

  • Fluid dynamics
  • Thermodynamics
  • Surface science

Background:

  • Bubbles in pure liquids typically have short lifetimes.
  • Surfactants are known to stabilize bubbles.
  • The behavior of bubbles in pure, hot oil has not been extensively studied.

Purpose of the Study:

  • To investigate the stability and behavior of air bubbles at the surface of pure, hot oil.
  • To understand the underlying physical mechanisms responsible for bubble persistence.
  • To explore the role of temperature gradients and fluid flow in bubble dynamics.

Main Methods:

  • Experimental observation of air bubbles at the surface of heated pure oil.
  • Analysis of fluid flow patterns using visual cues.
  • Interpretation of bubble behavior in relation to thermal gradients.

Main Results:

  • Air bubbles can persist at the surface of hot pure oil for minutes.
  • Temperature gradients were observed to be generated at the bubble interface.
  • Oil was consistently drawn towards the bubble apex, counteracting gravitational drainage.
  • Ascending Marangoni flows were identified as crucial for bubble existence.

Conclusions:

  • Thermal gradients in hot pure oil create persistent air bubbles.
  • Marangoni flows driven by temperature gradients provide remarkable stability to the oil film.
  • The dynamics of these "thermal bubbles" offer insights into fluid behavior under specific thermal conditions.