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Naturally-Forced Slug Flow Expander for Application in a Waste-Heat Recovery Cycle

Author

Listed:
  • Ben De Witt

    (Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada)

  • Ron Hugo

    (Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada)

Abstract

This paper investigates a slug-flow expander (SFE) for conversion of high-pressure gas/vapor into kinetic energy of liquid slugs. The energy transfer from high-pressure to kinetic energy is quantified using thrust plate measurements. Non-dimensional thrust data is used to quantify performance by normalizing measured thrust by thrust for the same water flow rate at zero air flow rate. A total of 13 expander configurations are investigated and geometries with the shortest cavity length and the smallest exit diameter are found to result in the largest non-dimensional thrust increase. Results show that thrust augmentation increases with the initiation of slug flow in the SFE. The analysis performed on the normalized thrust readings suggested that as the water and air flow were increased to critical conditions, the liquid slugs produced by the SFE augmented the thrust measurements. The final performance evaluation was based on linear regression of the normalized thrust measurements where slug flow was generated for each SFE architecture. Greater magnitudes of the slope from the linear regression indicated the propensity of the SFE to augment thrust. This analysis confirmed that for the SFE configurations over the range of values investigated, the SFE increased thrust up to three times its original value at no air flow. Given the inherent multiphase nature of the slug-flow expander, application to systems involving expansion of wetting fluids (water as part of a waste-heat recovery system) or air with water droplet formation (as part of a compressed-air energy storage system) could be considered.

Suggested Citation

  • Ben De Witt & Ron Hugo, 2014. "Naturally-Forced Slug Flow Expander for Application in a Waste-Heat Recovery Cycle," Energies, MDPI, vol. 7(11), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:11:p:7223-7244:d:42155
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    References listed on IDEAS

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