Conditionally-sampled turbulent and nonturbulent measurements of entropy generation rate in the transition region of boundary layers

Conditionally-sampled boundary layer data for an accelerating transitional boundary layer have been analyzed to calculate the entropy generation rate in the transition region. By weighing the nondimensional dissipation coefficient for the laminar-conditioned-data and turbulent-conditioned-data with the intermittency factor γ the average entropy generation rate in the transition region can be determined and hence be compared to the time averaged data and correlations for steady laminar and turbulent flows. It is demonstrated that this method provides, for the first time, an accurate and detailed picture of the entropy generation rate during transition. The data used in this paper have been taken from detailed boundary layer measurements available in the literature. This paper provides, using an intermittency weighted approach, a methodology for predicting entropy generation in a transitional boundary layer. Copyright © 2007 by ASME.

Full Text

Duke Authors

Cited Authors

  • Walsh, EJ; Nolan, KP; McEligot, DM; Volino, RJ; Bejan, A

Published Date

  • 2007

Published In

Volume / Issue

  • 129 / 5

Start / End Page

  • 659 - 664

International Standard Serial Number (ISSN)

  • 0098-2202

Digital Object Identifier (DOI)

  • 10.1115/1.2717622

Citation Source

  • SciVal