Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio <i>η</i> = 0.1

Turbulent Taylor–Couette flow between two concentric independently rotating cylinders with a radius ratio of $\eta = 0.1$ is studied experimentally. While the scope to study counter-rotating cases both cylinders, radial and azimuthal velocity components are recorded at different horizontal planes high-speed particle image velocimetry. The parametric considered set shear Reynolds numbers in range $20\,000 \leq Re_s 1.31 \times 10^5$ , rotation ratios $-0.06 \mu +0.008$ . observed fields had clear dependence on ratio, where patterns evolved more pronounced axial dependence. angular momentum transport computed as result given by quasi-Nusselt number. Nusselt number shows maximum for low case $\mu _{max}$ found $-0.011 &lt; _{max} -0.0077$ decreases stronger counter-rotation until minimum reached, it tends increase again higher rates. space–time behaviour turbulent showed existence propagating from inner region towards outer all cases. In addition, have been that tend propagate novel character high These enhance second mechanism has be expected.