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A New Method for Intense Cavitation Bubble Generation on Layer-by-Layer Assembled SLIPS.

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Surface modifications with artificial roughness and trapped lubricants enhance cavitation in microfluidic devices. This study demonstrates improved cavitation inception and intensity using engineered surfaces for better multiphase flow performance.

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Area of Science:

  • Fluid Dynamics
  • Microfluidics
  • Surface Science

Background:

  • Surface topology significantly influences cavitating flows in microfluidic systems.
  • Surface roughness can enhance mass transport and create new interaction areas, improving system performance.
  • Modifying microchannel surfaces is key to optimizing multiphase flow devices.

Purpose of the Study:

  • To enhance the generation and intensification of cavitating flows in microfluidic devices.
  • To develop artificial roughness elements and utilize trapped hydrophobic lubricants for cavitation control.
  • To investigate the impact of engineered surfaces on cavitation dynamics.

Main Methods:

  • Fabrication of microfluidic devices with varying hydraulic diameters and side wall roughness.
  • Assembly of silica nanoparticles using a layer-by-layer technique to create surface roughness (D2).
  • Implementation of Slippery Liquid-Infused Porous Surfaces (SLIPS) by trapping fluorinated oil (D3) for comparison with plain surfaces (D1).

Main Results:

  • Cavitation inception and supercavitation occurred at significantly lower upstream pressures in D2 and D3 configurations compared to D1.
  • Hydraulic flip, typically seen at high pressures in conical nozzles, was observed at moderate pressures in D2.
  • Engineered surfaces demonstrated a clear influence on cavitation behavior and air passage.

Conclusions:

  • Artificial roughness and SLIPS significantly enhance cavitation in microfluidic devices.
  • Surface modification strategies offer a viable method to control and intensify cavitating flows.
  • The findings provide insights for designing advanced microfluidic systems for multiphase flow applications.