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 › peer-review

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

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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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.",

keywords = "Channel flow, Drag reduction, Heat transfer reduction, Quadrant analysis, Surfactant solution",

author = "Li, {Feng Chen} and Yasuo Kawaguchi and Koichi Hishida",

note = "Funding Information: This research was carried out as a research project of the Center for Smart Control of Turbulence with the financial support of the Ministry of Education, Culture, Sports, Science and Technology (MECSST). ",

year = "2005",

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T1 - Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives

AU - Li, Feng Chen

AU - Kawaguchi, Yasuo

AU - Hishida, Koichi

N1 - Funding Information: This research was carried out as a research project of the Center for Smart Control of Turbulence with the financial support of the Ministry of Education, Culture, Sports, Science and Technology (MECSST).

PY - 2005/2

Y1 - 2005/2

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.

KW - Channel flow

KW - Drag reduction

KW - Heat transfer reduction

KW - Quadrant analysis

KW - Surfactant solution

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JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

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