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Numerical Analysis of the Turbulent Flow Field Applied to Thermal Spallation Drilling

[+] Author Affiliations
João Carlos R. Plácido

Petrobras CENPES, Rio de Janeiro, RJ, Brazil

Luis Fernando Figueira da Silva, Angela O. Nieckele

PUC/Rio, Rio de Janeiro, RJ, Brazil

Paper No. HT-FED2004-56353, pp. 709-714; 6 pages
doi:10.1115/HT-FED2004-56353
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 2, Parts A and B
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4691-1 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Thermal spallation is a possible drilling technique which consists of using hot supersonic jets as heat source to perforate hard rocks at high rates. This work presents a numerical analysis of a typical spallation drilling configuration, by the finite volume method. The time-averaged conservation equations of mass, momentum and energy are solved to determine the turbulent compressible gas phase flow field. Turbulence is predicted by the classical high Reynolds number κ-ε model, as well as with a low Reynolds number κ-ε model. The influence of the jet Reynolds number is investigated. Special attention is given to the rock surface temperature, since its accurate determination is required to predict spallation rates under field-drilling conditions.

Copyright © 2004 by ASME

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