106 citations · 238 across the 9 of their papers we have counts for
11 papers
Bubbly drag reduction using a hydrophobic inner cylinder in Taylor-Couette turbulence
Pim A. Bullee, Ruben A. Verschoof, Dennis Bakhuis +4
In this study we experimentally investigate bubbly drag reduction in a highly turbulent flow of water with dispersed air at $5.0 \times 10^{5} \leq \text{Re} \leq 1.7 \times 10^{6}…
Statistics of rigid fibers in strongly sheared turbulence
Dennis Bakhuis, Varghese Mathai, Ruben A. Verschoof +4
Practically all flows are turbulent in nature and contain some kind of irregularly-shaped particles, e.g. dirt, pollen, or life forms such as bacteria or insects. The effect of the…
Rough wall turbulent Taylor-Couette flow: the effect of the rib height
Ruben A. Verschoof, Xiaojue Zhu, Dennis Bakhuis +4
In this study, we combine experiments and direct numerical simulations to investigate the effects of the height of transverse ribs at the walls on both global and local flow proper…
The influence of wall roughness on bubble drag reduction in Taylor-Couette turbulence
Ruben A. Verschoof, Dennis Bakhuis, Pim A. Bullee +3
We experimentally study the influence of wall roughness on bubble drag reduction in turbulent Taylor-Couette flow, i.e.\ the flow between two concentric, independently rotating cyl…
Wall roughness induces asymptotic ultimate turbulence
Xiaojue Zhu, Ruben A. Verschoof, Dennis Bakhuis +4
Turbulence is omnipresent in Nature and technology, governing the transport of heat, mass, and momentum on multiple scales. For real-world applications of wall-bounded turbulence,…
Finite-sized rigid spheres in turbulent Taylor-Couette flow
Dennis Bakhuis, Ruben A. Verschoof, Varghese Mathai +3
We report on the modification of drag by neutrally buoyant spherical particles in highly turbulent Taylor-Couette flow. These particles can be used to disentangle the effects of si…
Air cavities at the inner cylinder of turbulent Taylor-Couette flow
Ruben A. Verschoof, Dennis Bakhuis, Pim A. Bullee +3
Air cavities, i.e. air layers developed behind cavitators, are seen as a promising drag reducing method in the maritime industry. Here we utilize the Taylor-Couette (TC) geometry,…
Periodically driven Taylor-Couette turbulence
Ruben A. Verschoof, Arne K. te Nijenhuis, Sander G. Huisman +2
We study periodically driven Taylor-Couette turbulence, i.e. the flow confined between two concentric, independently rotating cylinders. Here, the inner cylinder is driven sinusoid…
Bubble drag reduction requires large bubbles
Ruben A. Verschoof, Roeland C. A. van der Veen, Chao Sun +1
In the maritime industry, the injection of air bubbles into the turbulent boundary layer under the ship hull is seen as one of the most promising techniques to reduce the overall f…
Schlieren study of a sonic jet injected into a supersonic cross flow using high-current pulsed LEDs
Ella Giskes, Ruben A. Verschoof, Frans B. Segerink +1
Benefiting from the development of increasingly advanced high speed cameras, flow visualization and analysis nowadays yield detailed data of the flow field in many applications. No…
Self-similar decay of high Reynolds number Taylor-Couette turbulence
Ruben A. Verschoof, Sander G. Huisman, Roeland C. A. van der Veen +2
We study the decay of high-Reynolds number Taylor-Couette turbulence, i.e. the turbulent flow between two coaxial rotating cylinders. To do so, the rotation of the inner cylinder (…