Analysis of liquid outflow from single-outlet vessels

Koukouvaos, A; Kubie, J

Abstract

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.

Citation

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. https://doi.org/10.1177/095440620121500105

• Journal Article Type: Article
• Online Publication Date: Oct 1, 2001
• Publication Date: 2001
• Deposit Date: Jul 26, 2016
• Journal: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
• Print ISSN: 0954-4062
• Electronic ISSN: 2041-2983
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 215
• Issue: 10
• Pages: 1189-1210
• DOI: https://doi.org/10.1177/095440620121500105
• Keywords: single-outlet vessel, downcomer, two-phase flow, analysis, discharge rates, oscillations
• Public URL: http://researchrepository.napier.ac.uk/Output/315446