Discussão de hipóteses para modelagem da dispersão de gases pesados na atmosfera

Authors

  • César Antônio Leal Departamento de Engenharia Nuclear, UFRGS, Porto Alegre, RS.
  • Edson Abel dos S. Chiaramonte Departamento de Engenharia Mecânica, UFRGS, Porto Alegre, RS.

DOI:

https://doi.org/10.5902/2179460X36917

Keywords:

gases pesados, dispersão, excesso de densidade, pluma, entrada de ar.

Abstract

As liberações de gases pesados a nível do solo na atmosfera podem ser instantânea, contínua e intermitente. Neste artigo nós apresentamos um modelo aproximado, que represente estes diversos tipos de liberações. As liberações contínua e intermitente são representadas no modelo a partir da soma e combinação de diversas liberações instantâneas sucessivas (o modelo de “puff”). Nós mostramos o modelo matemático aproximado de propriedades médias que descreve a liberação instantânea de gás pesado e as etapas do processo de soma e combinação de “puffs” para representação de uma liberação contínua (pluma). O modelo de dispersão de pluma gaussiana é usado na fase de dispersão de gás neutro. Na última parte do artigo, os resultados numéricos obtidos com o modelo são comparados com valores experimentais de liberações contínuas obtidos na literatura.

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References

Eidsvik, K. J., 1980. “A Model for Heavy Gas Dispersion in the Atmosphere”, Atmospheric Environment, Vol. 14, pp. 769-777.

Fay, J. A. e S. G. Zemba, 1986. “Integral Model of Dense Gas Plume Dispersion”, Atmospheric Environment, Vol. 20, pp. 1347-1354.

Fryer, L. S. e G. D. Kaiser, 1979. DENZ - A computer program for the calculation of the dispersion of dense toxic or explosive gases in the atmosphere, Technical Report SRD-R152, Safety and Reliability Directorate, Inglaterra.

Havens, J., 1992. “Review of dense gas dispersion field experiments”, J. Loss Prev. Process Ind.,Vol. 5, pp. 28-41.

Leal, C. e Chiaramonte, E., 1998. “Simulação numérica do comportamento de “puffs” para representar a dispersão de gases pesados na atmosfera”, 12° Congresso Brasileiro de Engenharia Química, Porto Alegre.

Melhem G. A. e A. D. Little, 1992. Advanced Consequence Modeling - Emission, Dispersion, Fires and Explosions, Van Nostrand Reinhold, New York.

van Buijtenen, C. J. P., 1979. Methods for the calculation of the physical effects of the escape of dangerous material (liquids and gases) Part II, DISPERSION, Chapter 7, Directorate-General of Labour, Netherlands.

Wheatley, C. J., 1985. Dispersion of Heavy Gases, Von Karman Institute for Fluid Dynamics.

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Published

2000-01-14

How to Cite

Leal, C. A., & Chiaramonte, E. A. dos S. (2000). Discussão de hipóteses para modelagem da dispersão de gases pesados na atmosfera. Ciência E Natura, 217–236. https://doi.org/10.5902/2179460X36917

Issue

CIÊNCIA E NATURA, SPECIAL VOLUME, 2000: WORKSHOP ON PHYSICS OF THE PLANETARY BOUNDARY LAYER AND DISPERSION PROCESS MODELING

Section

Articles

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