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Monodispersed Bubble Generation Using Hydrophobic Orifices: The Extended Tate's Law
Bo Liu1, Hao Zhang1, Haiqiang Yang1
1Department of Mechanical and Power Engineering, East China University of Science and Technology, No. 130 Meilong Road, Lingyunlu Street, Xuhui District, Shanghai 200237, China.
ACS Omega
|May 6, 2024
Summary
Hydrophobic surfaces generate monodispersed bubbles from submerged orifices, matching Sauter mean diameters of hydrophilic surfaces. This controlled bubble generation benefits precise industrial applications like semiconductor fabrication.
Area of Science:
- Fluid dynamics
- Surface science
- Materials science
Background:
- Bubble generation using submerged orifices is crucial in various industries.
- Surface wettability significantly impacts bubble departure diameter.
- Existing methods often lack precise control over bubble size distribution.
Purpose of the Study:
- To investigate bubble generation and departure from hydrophobic perfluoroalkoxy (PFA) tubes in water.
- To compare bubble characteristics from hydrophobic PFA orifices with hydrophilic quartz orifices.
- To understand the dynamics of bubble formation under varying gas inflow rates.
Main Methods:
- Utilized orifices (0.3-2 mm) drilled on hydrophobic PFA tubes.
- Varied gas inflow rates from 33 to 200 mL/min.
- Analyzed bubble generation and departure dynamics, comparing with Tate's law.
Main Results:
- Hydrophobic PFA orifices produced monodispersed bubbles, unlike hydrophilic quartz orifices with wider distributions.
- Sauter mean diameters from PFA orifices closely matched those from quartz orifices.
- Dynamic bubbling conditions, explained by continuous gas inflow, increased bubble volume while adhering to Tate's law.
Conclusions:
- Monodispersed bubble generation is achievable using hydrophobic surfaces under dynamic conditions.
- This controlled bubble generation offers significant advantages for industries requiring precise bubble size.
- Applications include bubble-assisted wet etching and cleaning processes in semiconductor fabrication.
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