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Coalescence of bubbles creates a new departure mechanism, enabling smaller bubble sizes in systems like water splitting. This finding unifies bubble departure theories and offers design insights for energy applications.

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Area of Science:

  • Thermodynamics and Fluid Dynamics
  • Energy Systems Engineering

Background:

  • Bubble departure is crucial in boiling and electrochemical systems.
  • Current models, often buoyancy-driven, fail to explain small bubble departure in water splitting and high heat flux scenarios.

Purpose of the Study:

  • To identify and characterize a new bubble departure regime driven by bubble coalescence.
  • To develop a unified model for bubble departure diameter considering both buoyancy and coalescence effects.

Main Methods:

  • Experimental observation of bubble evolution and departure.
  • Analysis of three-phase contact line dynamics during bubble coalescence.
  • Development of a unified theoretical relationship between departure diameter and nucleation site density.

Main Results:

  • A novel coalescence-induced bubble departure regime was identified, leading to smaller departure diameters than buoyancy-driven limits.
  • Bubble base area reduction during coalescence significantly promotes departure.
  • A unified relationship was established linking departure diameter, nucleation site density, and departure modes.

Conclusions:

  • Bubble coalescence is a significant mechanism for bubble departure, especially for small bubbles.
  • The findings provide a more comprehensive understanding of bubble dynamics in energy systems.
  • The unified model offers practical design guidelines for enhancing bubble departure efficiency in energy technologies.