期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 48, 期 5, 页码 965-973出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2004.09.029
关键词
channel flow; surfactant solution; drag reduction; heat transfer reduction; quadrant analysis
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 304K and at three Reynolds numbers (based on channel height, bulk velocity and solvent viscosity): 3.5 x 10(4), 2.5 x 10(4) and 1.5 x 10(4). 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. (C) 2004 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据