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Diffuser surface wettability significantly impacts microbubble formation. Below a 90° contact angle, bubbles are smaller, while above 90°, they are larger, a key finding for microbubble applications.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Microbubbles are crucial for applications like biofuel production and medical imaging.
  • Diffuser characteristics (pore size, orientation, gas flow rate) influence bubble formation.
  • The role of diffuser surface wettability at the gas-liquid-diffuser interface is understudied.

Purpose of the Study:

  • To investigate how diffuser surface wettability affects microbubble formation dynamics.
  • To examine the impact of engineered wetting variations on bubble size and cloud characteristics.
  • To identify the critical contact angle influencing bubble generation.

Main Methods:

  • Experimental investigation of bubble formation using surfaces with varied wettability (10° to 110° contact angles).
  • Utilized thiol and silane modified surfaces, single pores, pore arrays, and commercial sintered diffusers.
  • Analyzed bubble size and cloud characteristics across a range of gas flow rates (2.5–60 mL min⁻¹).

Main Results:

  • A distinct switching point in bubble size was observed at a contact angle of 90°.
  • Surfaces with contact angles <90° produced significantly smaller microbubbles compared to those with angles >90°.
  • This wettability effect was consistent across various diffuser types and flow rates; surface topography can modulate this effect.

Conclusions:

  • Diffuser surface wettability is a critical parameter controlling microbubble size.
  • Surface wettability offers a tunable mechanism for controlling microbubble generation for diverse applications.
  • Understanding the gas-liquid-diffuser interface is key to optimizing microbubble production technologies.