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Water's tensile strength measured using an optofluidic chip
1School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798. lizh0018@ntu.edu.sg.
Lab on a Chip
|March 27, 2015
Summary
Researchers directly measured the tensile strength of water using an optofluidic chip. This novel method determined water
Area of Science:
- Fluid Dynamics and Soft Matter Physics
Background:
- Direct measurement of the tensile strength of liquids, particularly water, has been a long-standing challenge in physics.
- Understanding liquid tensile strength is crucial for phenomena like cavitation and fluid behavior under tension.
Purpose of the Study:
- To directly measure the tensile strength of water using a novel optofluidic technique.
- To establish a method for investigating the tensile strength of other soft materials.
Main Methods:
- Utilized an optofluidic chip to dynamically stretch water in a microchannel via laser-induced shock reflection.
- Measured air-water interface deformation displacements to determine shock pressures.
- Observed vapor bubble formation to identify the cavitation threshold and critical distance.
Main Results:
- Directly measured the tensile strength of water at 20 °C to be -33.3 ± 2.8 MPa.
- Successfully measured the tensile strength of glycerol at 20 °C to be -59.8 ± 10.7 MPa.
- Demonstrated the applicability of the optofluidic method for soft materials.
Conclusions:
- The optofluidic chip provides a reliable method for directly measuring liquid tensile strength.
- The technique opens new avenues for studying cavitation and material properties under tension.
