Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives
Structural analysis of turbulent transport in a heated drag-reducing channel flow with surfactant additives
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DOI：
10.1016/j.ijheatmasstransfer.2004.09.029
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发表时间：
2005-02
影响因子：
5.2
通讯作者：
Feng-chen Li;Y. Kawaguchi;K. Hishida
中科院分区：
文献类型：
--
作者：
Feng-chen Li;Y. Kawaguchi;K. Hishida
通过同时测量热边界层中的速度和温度脉动，研究了加热减阻表面活性剂溶液（CTAC，30wppm）通道流中的湍流输运特性。在入口流体温度为304K和三个雷诺数（基于通道高度、体积速度和溶剂粘度）：3.5×104、2.5× 104和1.5×104下进行测量。结构分析表明，减阻添加剂抑制了低动量流体的喷射运动（第二象限运动）和高动量流体的扫掠运动（第四象限运动），但对高动量流体的向外运动和低动量流体的向壁运动（第一象限运动）没有明显影响。壁面法向湍流热通量的降低是由于第二和第四象限运动的贡献减少。
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): 3.5×104, 2.5×104and 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.