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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Movimiento molecular sin equilibrio en una onda de choque hipersónica.

G Pham-Van-Diep, D Erwin, E P Muntz

Science (New York, N.Y.)

|August 11, 1989

Resumen

Las distribuciones de velocidad molecular se midieron dentro de ondas de choque hipersónicas, revelando un carácter bimodal. Esta observación confirma el trabajo de Mott-Smith.

Área de la Ciencia:

Dinámica de fluidos La dinámica de fluidos.
La aerodinámica es muy importante.
Química física es la química física de las cosas.

Sus antecedentes:

Los flujos hipersónicos implican cambios rápidos en las propiedades del gas a través de ondas de choque.
Mott-Smith planteó la hipótesis de una distribución bimodal de la velocidad molecular en las ondas de choque.
La observación directa de esta distribución bimodal ha estado ausente.

Objetivo del estudio:

Para medir experimentalmente las velocidades moleculares dentro de una onda de choque hipersónica.
Para verificar la hipotética distribución bimodal de la velocidad molecular.
Para validar métodos computacionales para el análisis de flujo de no equilibrio.

Principales métodos:

Medición experimental de las velocidades moleculares.

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Análisis de las funciones de distribución de la velocidad molecular.

Técnica de Simulación Directa Monte Carlo (DSMC) para el modelado computacional.

Principales resultados:

Observación directa de una distribución cualitativamente bimodal de la velocidad molecular.
La distribución observada es consistente con las distribuciones a ambos lados del choque.
DSMC calcula con precisión la función de distribución de la velocidad molecular.

Conclusiones:

La distribución de la velocidad molecular en las ondas de choque hipersónicas es de hecho bimodal.
Los datos experimentales apoyan la hipótesis de Mott-Smith.
DSMC es un método confiable para simular flujos de alto desequilibrio.