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Investigation of Erosive Flow Injected Through Apertures into a Narrow Annulus

Perelstein, Yuri
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1463073062

Abstract Details

2016, PhD, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
It is common to convey solid particulates using liquids, forming a slurry. Those slurries conveyed in conduits generate erosion caused by particulate impingements on the walls. The erosive action of slurry may significantly reduce the service life of processing equipment, even at slow transport velocities. The particulates are subjected to the forces exerted by the carrying liquid. Therefore, continuous phase flow field strongly influences erosion by slurry. The erosive action and relevant flow features are investigated herein for a case of dilute slurry passing from the inner to the outer annulus through four equally spaced rectangular apertures on the periphery of a tube dividing these two conduits. This study consists of numerical and experimental investigations. The velocity and the Reynolds stresses were measured using Stereoscopic Particle Image Velocimetry. The erosive flow features of the continuous phase flow were identified and explored in detail. The measurements show that the flow develops high velocity near aperture edges directed towards the outermost wall. These measurements allowed validating the numerical solution of the continuous phase. The flow of dilute slurry was solved numerically. A consideration was given to the effects of particle size on erosion rate and statistical distribution of impact velocity, angle, and total erodent mass generating adverse wear rates. A confined trailing vortex forms at the longitudinal edge of the aperture, amplifying the erosive wear on the outer wall of the annulus. Also, large amount of particulates passes near the aperture horizontal downstream edge at high velocity and intensifies the erosion rate above it. The effect of these flow features becomes more pronounced for larger particulates. The statistical analysis of impact velocity, angle, and mass showed that the mean velocity in the channel dominates erosion caused by impacts of large particulates. On the other hand, the near-wall turbulence mainly affects the erosion resulting from impacts by small particulates. Note:
Ephraim Gutmark, Ph.D. D.Sc. (Committee Chair)
Shaaban Abdallah, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
271 p.
Aerospace Materials
Solid particle erosion; Slurry erosion; Vortex-induced wear; Flow through aperture; Impaction statistics; Particle Image Velocimetry

Recommended Citations

Citations

  • Perelstein, Y. (2016). Investigation of Erosive Flow Injected Through Apertures into a Narrow Annulus [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1463073062

    APA Style (7th edition)

  • Perelstein, Yuri. Investigation of Erosive Flow Injected Through Apertures into a Narrow Annulus. 2016. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1463073062.

    MLA Style (8th edition)

  • Perelstein, Yuri. "Investigation of Erosive Flow Injected Through Apertures into a Narrow Annulus." Doctoral dissertation, University of Cincinnati, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1463073062

    Chicago Manual of Style (17th edition)

ucin1463073062
78
© 2016, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.