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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.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 4, 2003

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.

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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:

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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.