Title page for ETD etd-12042009-095851


Type of Document Master's Thesis
Author Cowan, Jonathan B
Author's Email Address jbcowan@vt.edu
URN etd-12042009-095851
Title Investigation of Erosion and Deposition of Sand Particles within a Pin Fin Array
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Tafti, Danesh K. Committee Chair
Ekkad, Srinath V. Committee Member
Paul, Mark R. Committee Member
Keywords
  • Particle
  • Deposition
  • Erosion
  • Pin Fin
  • Computational Fluid Dynamics
Date of Defense 2009-12-03
Availability unrestricted
Abstract
The transport of particulates within both a fully developed and developing pin fin arrays is explored using

computational fluid dynamics (CFD) simulations. The simulations are carried out using the LES solver,

GenIDLEST, for the fluid (carrier) phase and a Langragian approach for the particle (dispersed) phase. A

grid independency study and validation case versus relevant experiments are given to lend confidence to

the numerical simulations. Various Stokes numbers (0.78, 3.1 and 19.5) are explored as well as three nondimensional

particle softening temperatures (θST = 0, 0.37 and 0.67). The deposition is shown to increase

with decreasing particle Stokes number and thus decreasing size from 0.005% for Stp = 19.5 to 13.4% for

Stp = 0.78 and is almost completely concentrated on the channel walls (99.6% - 100%). The erosion

potential is shown to increase with Stokes number and is highest on the pin faces. As is to be expected,

the deposition increases with decreasing softening temperature from 13.4% at θST = 0.67 to 79% for θST

=0. Overall, the channel walls of the array show the greatest potential for deposition. On the other hand,

the pin faces show the greatest potential for erosion. Similarly, the higher Stokes number particles have

more erosion potential while the lower Stokes number particles have a higher potential for erosion.

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