Research Output
Analysis of liquid outflow from single-outlet vessels
  The paper presents experimental and theoretical investigation of the outflow of liquids from single-outlet vessels incorporating a vertical downcomer. In such vessels the liquid leaving through the outlet of the downcomer is replaced by another fluid, which enters the vessel-downcomer system through the same opening. Experimental results of the variation of the void fraction and pressure in the vessel with elapsed time are presented. It is shown that the flow is generally oscillatory, and the conditions required for the establishment of the fully developed oscillatory flow are reported. A theoretical model of the fully developed oscillatory flow is developed. The model describes well the frequency of the oscillatory flow and the variation of the gas void fraction in the vessel with elapsed time. The model somewhat overpredicts the amplitude of the pressure oscillations. Thermodynamic aspects of this flow are also considered.

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  • Date:

    01 October 2001

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  • Library of Congress:

    TJ Mechanical engineering and machinery

  • Dewey Decimal Classification:

    621 Electronic & mechanical engineering


Koukouvaos, A., & Kubie, J. (2001). Analysis of liquid outflow from single-outlet vessels. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 215(10), 1189-1210.



single-outlet vessel, downcomer, two-phase flow, analysis, discharge rates, oscillations

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