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Highlighting a Cooling Regime in Liquids under Submillimeter Flows
Patrick Baroni1, Patrice Bouchet2, Laurence Noirez1
1†Laboratoire Léon Brillouin (CEA-CNRS), Ce-Saclay, 91191 Gif-sur-Yvette Cédex, France.
The Journal of Physical Chemistry Letters
|August 19, 2015
Summary
Researchers observed liquid shear flow at the submillimeter scale using thermal imaging. Unexpectedly, liquids like water cooled during flow, challenging conventional physics and suggesting a new endothermic process.
Area of Science:
- Fluid Dynamics
- Thermodynamics
- Materials Science
Background:
- Conventional understanding suggests liquid shear flow generates heat.
- Previous studies lacked the resolution to observe microscale flow phenomena.
- The energy dynamics of liquid flow at small scales were poorly understood.
Purpose of the Study:
- To investigate the thermal effects of liquid shear flow at the submillimeter scale.
- To observe and characterize the phenomenon of cooling during liquid flow.
- To explore potential applications of this newly observed effect.
Main Methods:
- Utilized microinfrared thermal imaging to monitor temperature changes.
- Conducted experiments on ordinary liquids, including water, flowing over wetting surfaces.
- Analyzed thermal data to correlate shear rates with temperature variations.
Main Results:
- Observed a cooling effect in liquids, such as water, during shear flow on wetting surfaces.
- Demonstrated that internal energy increase can manifest as cooling before conventional heating.
- Identified a potential transient stretching state responsible for the counterintuitive cooling.
Conclusions:
- Liquid shear flow at the submillimeter scale can produce a cooling effect.
- This phenomenon challenges existing thermodynamic models of fluid dynamics.
- Shearing liquids offers a potential novel endothermic process for various applications.
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