Dataset corresponding to publication: "Effect of axially varying sandpaper roughness on bubbly drag reduction in Taylor–Couette turbulence "

This dataset contains measurement data from drag comparison experiments over rough, smooth, and partly rough walls in turbulent flows. A Taylor–Couette apparatus was used for the experiments, of which the inner cylinder was made rough by attaching sandpaper belts to it. By varying the width (indicated by <i>s/d</i>) of the sandpaper belts, and also the corresponding spacing between two belts, an axially varying pattern of a rough-smooth surface was created. The drag reducing effect of air bubbles is studied for the different surface roughness configurations.<br>See readme.txt file for more information regarding the dataset.

本数据集包含湍流流动中粗糙壁面、光滑壁面以及部分粗糙壁面的阻力对比实验测量数据。本实验采用泰勒-库埃特（Taylor–Couette）装置，通过在其内筒表面粘贴砂纸条带实现壁面粗糙化。通过调整砂纸条带的宽度（以<i>s/d</i>表示，即砂纸条带宽度与圆柱直径的比值）以及相邻砂纸条带间的间距，构建了轴向变化的粗糙-光滑交替壁面结构。针对不同壁面粗糙度配置方案，研究了气泡的减阻效果。有关本数据集的更多详细信息，请参阅readme.txt文件。