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Driving water cavitation in a hydrogel cavity
Michele Curatolo1, Paola Nardinocchi2, Luciano Teresi1
1Università degli Studi Roma Tre, via della Vasca Navale 84, Roma, Italy. michele.curatolo@uniroma3.it teresi@uniroma3.it.
Soft Matter
|February 9, 2018
Summary
Hydrogel dehydration reveals two distinct phases: ballooning deformation and suction. The latter induces negative pressures, leading to water cavitation within the cavity.
Area of Science:
- Materials Science
- Fluid Dynamics
- Physical Chemistry
Background:
- Hydrogels are widely used in various applications, but their dehydration dynamics are not fully understood.
- Understanding hydrogel behavior during dehydration is crucial for optimizing their performance and preventing failure.
Purpose of the Study:
- To investigate the transient phases of hydrogel dehydration with an internal water-filled cavity.
- To analyze the deformation modes and pressure dynamics within the cavity during dehydration.
- To identify factors influencing negative pressure formation and potential water cavitation.
Main Methods:
- Observational study of hydrogel dehydration dynamics.
- Analysis of deformation modes, including inflatable-balloon and suction effects.
- Investigation of negative pressure generation and cavitation phenomena.
Main Results:
- Two distinct transient phases were identified during hydrogel dehydration.
- The first phase is characterized by inflatable-balloon deformation.
- The second phase involves a suction effect, leading to non-homogeneous wall deformation and negative pressures up to cavitation levels.
Conclusions:
- Hydrogel dehydration is a complex process with distinct dynamic phases.
- The suction-driven phase can induce significant negative pressures, potentially causing water cavitation.
- Precise tuning of geometrical and material parameters is possible for controlling cavitation pressure.
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