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

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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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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AU - Kawaguchi, Yasuo

AU - Hishida, Koichi

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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 - Drag reduction

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KW - Surfactant solution

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