Laminar coupled flow downstream of an asymmetric sudden expansion

George C. Vradis, Lara VanNostrand

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of the expansion ratio and temperature varying viscosity on the hydrodynamic and heat transfer Characteristics of the laminar flowfield over a backward facing step is studied numerically. Both walls are maintained at uniform but different temperatures, while the flow at the step is assumed to be hydrodynamically and thermally fully developed. Calculations are carried out for different Reynolds numbers in the laminar flow regime and for a Prandtl number of 5.3. It is shown that an increase in the expansion ratio results in the augmentation of the heat transfer coefficient along both walls, the augmentation becoming substantial at high expansion ratios. Empirical correlations are obtained for the average Stanton number in the recirculating zone as a function of the Reynolds number and the expansion ratio. The variation of viscosity with temperature is shown to have a substantial effect on both the reattachment length and the local Nusselt number distribution along both the step and flat walls, the effect becoming stronger as the Reynolds number increases.

Original languageEnglish (US)
Pages (from-to)288-295
Number of pages8
JournalJournal of thermophysics and heat transfer
Volume6
Issue number2
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science

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