Experiments and analyses of supercritical CO2 flow instability with study of dimensionless parameters
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Date
2020-11-10
Authors
Singh, Inderjit
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Abstract
Very limited experimental data on supercritical flow instability is present in the literature. To enrich this limited database and to further the understanding of supercritical flow instability, an experimental study was conducted using two vertical parallel channels facility (TVPC) with supercritical CO2 flowing upward. A total of 23 experimental cases were performed on the new facility; sixteen were published by Saini (2019) and the rest of the cases are presented herein. The system pressure for the seven new cases was in the range 8.25 – 9.1MPa and the inlet temperature was in the range 0.5 – 10.05 °C. For all the cases, oscillatory flow instability was observed.
The current and the previous experiments performed by Saini were numerically analyzed without and with wall-heat storage effect using an in-house 1-D linear program. The numerical results showed good agreement with the experimental data. The inclusion of the wall-heat storage effect, for this parallel-channel system, yields a very small effect on the flow stability boundary. In addition, the dimensionless parameters proposed by Ambrosini and Sharabi (2008) for supercritical flow were examined using CO2 experimental instability data in combination with the numerical results. The dimensionless parameters performed very well.
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Keywords
Parallel channel super-critical flow instability, Dimensionless parameters assessment, Supercritical CO2, Thermal hydraulic instability, Wall-heat storage