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Modeling of Saturated Two-Phase Flow Expansion across an Abrupt Area Change

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2017

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Abstract (2. Language): 
In this study, the pressure recovery of two-phase saturated steam-water mixture is determined across sudden expansion fittings with the vapor phase being compressible. The pressure recovery is determined by employing the conservative equations of mass, momentum and energy with entropy generation based on two-phase separated flow model. The pressure and steam quality at the inlet of the abrupt flow area are in a range of 0.15 8.5 MPa and quality of 0.5 1. respectively. Also, the ratio of the inlet to outlet flow area is in the range of 0.1 1. During an adiabatic expansion process, the profile of the entropy does not increase monotonically, but it reaches a maximum value at the inlet quality of x1 0.3, before it goes to zero and the process becomes an isentropic process at the specified inlet pressure of 1 p 0.2 MPa. At this steam quality the conversion rate of the dynamic pressure head into static change becomes a minimum. The trend of the curves for pressure recovery against two phase mass velocity is proportional to the inverse of the inlet pressure so that the higher the inlet pressure the lower increase in pressure recovery is obtained. The results also show a good agreement with the experimental data in the literature.
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International Journal of Science and Engineering Investigations, Volume 6, Issue 65, June 2017 154
www.IJSEI.com Paper ID: 66517-26
ISSN: 2251-8843
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