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Homogeneous nucleation in water in microfluidic channels
Keita Ando1, Ai-Qun Liu, Claus-Dieter Ohl
1School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Physical Review Letters
|September 26, 2012
Summary
Researchers developed a microfluidic method to observe homogeneous nucleation of vapor bubbles in liquids. This technique overcomes impurity issues, revealing water
Area of Science:
- Fluid dynamics
- Thermodynamics
- Materials science
Background:
- Homogeneous nucleation of vapor bubbles in liquids is experimentally challenging due to impurities.
- Prior studies were limited by spontaneous nucleation from contaminants at surfaces or within the bulk liquid.
Purpose of the Study:
- To develop a reliable method for observing homogeneous bubble nucleation.
- To investigate the nucleation threshold of liquids under tension.
Main Methods:
- A microfluidic approach utilizing laser-induced shock waves interacting with an air-liquid interface.
- Dynamic stretching of the liquid within a microchannel to induce nucleation.
- Euler flow simulations for comparison with experimental observations.
Main Results:
- Achieved reproducible observations of homogeneous vapor bubble nucleation.
- Successfully eliminated the influence of impurities on nucleation.
- Predicted the nucleation threshold for water at room temperature to be -60 MPa.
Conclusions:
- The proposed microfluidic technique enables the study of homogeneous nucleation.
- The experimental findings provide a quantitative measure of the nucleation threshold for water.
