Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives

Feng Chen Li, Yasuo Kawaguchi, Koichi Hishida

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Turbulence transport features in a heated drag-reducing surfactant solution (CTAC, 30wppm) channel flow was investigated by simultaneously measuring velocity and temperature fluctuations in the thermal boundary layer. Measurement was made at inlet fluid temperature of 304 K and at three Reynolds numbers (based on channel height, bulk velocity and solvent viscosity): 3.5 × 104, 2.5 × 104 and 1.5 × 104. Structural analysis showed that the drag-reducing additives inhibited the motions associated with ejections of low-momentum fluid away from the wall and sweeps of high-momentum fluid toward the wall (the second and fourth quadrant motion respectively) but had no obvious effect on the outward motion of high-momentum fluid and wall-ward motion of low-momentum fluid (the first and third quadrant motion respectively). The depression of wall-normal turbulent heat flux was due to the decreased contributions of the second and fourth quadrant motions.

Original languageEnglish
Pages (from-to)965-973
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume48
Issue number5
DOIs
Publication statusPublished - 2005 Feb 1

Keywords

  • Channel flow
  • Drag reduction
  • Heat transfer reduction
  • Quadrant analysis
  • Surfactant solution

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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