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Supercritical vaporization: distinguishable fluid regions.
Manuel Arias-Zugasti1, Jose L Castillo, Pedro L García-Ybarra
1Departamento de Física Matemática y Fluidos, UNED, Apartado 60141, 28080 Madrid, Spain.
Summary
Sudden vaporization of cold fluid pockets in hot supercritical atmospheres creates distinct liquid-like and gas-like regions. Heat transport transitions from conduction to convection due to thermal expansion effects.
Area of Science:
- Thermodynamics
- Fluid Dynamics
- Heat Transfer
Background:
- Understanding fluid behavior at supercritical pressures is crucial for various industrial applications.
- The dynamics of phase transitions in extreme conditions are not fully understood.
Purpose of the Study:
- To analyze the vaporization of cold fluid pockets in hot supercritical atmospheres.
- To identify distinct fluid regions and heat transport mechanisms during this process.
Main Methods:
- Theoretical analysis of fluid behavior under supercritical conditions.
- Investigation of heat transport mechanisms (conduction and convection).
- Identification of transition regions based on thermal expansion coefficient.
Main Results:
- A distinct, thin transition region is identified at supercritical moderate pressures and high temperatures.
- This region separates a cold, liquid-like zone (conduction-dominated heat transport) from a hot, gas-like zone.
- The hot zone exhibits convective and conductive heat transport driven by thermal expansion-induced Stefan flow.
Conclusions:
- The study elucidates the complex heat and mass transfer phenomena during supercritical fluid vaporization.
- The findings provide insights into the distinct thermal properties of the separated fluid regions.
- The identified transition region is key to understanding the overall process dynamics.