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

Feng Chen Li; Yasuo Kawaguchi; Koichi Hishida

doi:10.1016/j.ijheatmasstransfer.2004.09.029

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

Feng Chen Li, Yasuo Kawaguchi, Koichi Hishida

Department of System Design Engineering

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	965-973
Number of pages	9
Journal	International Journal of Heat and Mass Transfer
Volume	48
Issue number	5
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2004.09.029
Publication status	Published - 2005 Feb 1

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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

Cite this

Li, F. C., Kawaguchi, Y., & Hishida, K. (2005). Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives. International Journal of Heat and Mass Transfer, 48(5), 965-973. https://doi.org/10.1016/j.ijheatmasstransfer.2004.09.029

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

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.",

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N2 - 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.

AB - 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.

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KW - Surfactant solution

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10.1016/j.ijheatmasstransfer.2004.09.029