Experimental Investigation of Thermal and Hydrodynamic Development Regions for Drag-Reducing Surfactant Solutions
Experimental Investigation of Thermal and Hydrodynamic Development Regions for Drag-Reducing Surfactant Solutions
复制标题
减阻表面活性剂溶液的热力和流体动力学发展区域的实验研究
DOI：
10.1115/1.2824103
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发表时间：
1997
影响因子：
--
通讯作者：
E. Matthys
中科院分区：
文献类型：
--
作者：
K. Gasljevic;E. Matthys
测量和分析了圆管入口区域表面活性剂溶液所表现出的摩擦和传热减少，特别关注局部传热和摩擦之间的关系。使用两种入口配置，圆锥收缩和丝网塞用作速度分布平坦化的装置。研究了温度和速度分布的同时发展以及通过流体动力学预先发展的流动来发展温度分布。有趣的是，表面活性剂溶液的局部传热测量与聚合物溶液开发的相关性非常匹配，但对于表面活性剂，传热和速度分布的发展似乎是耦合的，这与聚合物溶液的情况不同。在低扰动水平下，发展模式似乎与速度和入口类型无关。然而，在高扰动水平下，也观察到并量化了流体本身的一些显着变化，这可能是由于入口区域高局部剪切应力导致胶束结构暂时退化所致。
The reductions in friction and heat transfer exhibited by a surfactant solution in the entry region of a circular pipe were measured and analyzed, with special attention paid to the relationship between the local heat transfer and friction. Two entrance configurations were used, a cone contraction and wire mesh plugs used as a device for velocity profile flattening. Both the simultaneous development of temperature and velocity profiles and the development of temperature profile with hydrodynamically predeveloped flow were studied. Interestingly, the local heat transfer measurements for surfactant solutions matched very well a correlation developed for polymer solutions, but for surfactants the development of the heat transfer and velocity profiles appear coupled, unlike what is thought to happen for polymer solutions. The development patterns appear to be independent of velocity and entrance type at low disturbance levels. At high disturbance levels, however, some striking changes in the fluid itself, likely due to temporary micellar structure degradation by high local shear stress in the inlet region, were observed as well, and quantified.