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A new turbulent Taylor-Couette system consisting of two independentlyrotating cylinders has been constructed. The gap between the cylinders has aheight of 0.927 m, an inner radius of 0.200 m, and a variable outer radius(from 0.279 to 0.220 m). The maximum angular rotation rates of the inner andouter cylinder are 20 and 10 Hz, respectively, resulting in Reynolds numbers upto 3.4 x 10^6 with water as working fluid. With this Taylor-Couette system, theparameter space (Re_i, Re_o, {\eta}) extends to (2.0 x 10^6, {\pm}1.4 x 10^6,0.716-0.909). The system is equipped with bubble injectors, temperaturecontrol, skin-friction drag sensors, and several local sensors for studyingturbulent single-phase and two-phase flows. Inner cylinder load cells detectskin-friction drag via torque measurements. The clear acrylic outer cylinderallows the dynamics of the liquid flow and the dispersed phase (bubbles,particles, fibers, etc.) inside the gap to be investigated with specializedlocal sensors and nonintrusive optical imaging techniques. The system allowsstudy of both Taylor-Couette flow in a high-Reynolds-number regime, and themechanisms behind skin-friction drag alterations due to bubble injection,polymer injection, and surface hydrophobicity and roughness.

The Twente turbulent Taylor-Couette (T3C) facility: Strongly turbulent (multiphase) flow between two independently rotating cylinders