Air cavities at the inner cylinder of turbulent Taylor–Couette flow

Verschoof, Ruben A.; Bakhuis, Dennis; Bullee, Pim A.; Huisman, Sander G.; Sun, Chao; Lohse, Detlef

doi:10.1016/j.ijmultiphaseflow.2018.04.016

Cited by 13 publications

(9 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As in the closed TC system the total dissipation is proportional to the total torque [204], the decrease in dissipation implies a decrease in the overall drag. Bringing all these fundamental insights into bubble drag reduction towards applications in naval industry however still is a very long way to go and other concepts like air cavities may be more efficient [221]. We are presently collaborating with the Dutch Maritime Research Institute (MARIN) in Wageningen on this subject.…”

Section: Effective Bubble Force Models Dispersed Bubbly Flow Anmentioning

confidence: 99%

Bubble puzzles: From fundamentals to applications

Lohse

2018

Phys. Rev. Fluids

Self Cite

139

View full text Add to dashboard Cite

For centuries, bubbles have fascinated artists, engineers, and scientists alike. In spite of century-long research on them, new and often surprising bubble phenomena, features, and applications keep popping up. In this paper I sketch my personal scientific bubble journey, starting with single bubble sonoluminescence, continuing with sound emission and scattering of bubbles, cavitation, snapping shrimp, impact events, air entrainment, surface micro-and nanobubbles, and finally coming to effective force models for bubbles and dispersed bubbly two-phase flow. In particular, I also cover various applications of bubbles, namely in ultrasound diagnostics, drug and gene delivery, piezo-acoustic inkjet printing, immersion lithography, sonochemistry, electrolysis, catalysis, acoustic marine geophysical survey, and bubble drag reduction for naval vessels, and show how these applications crossed my way. I also try to show that good and interesting fundamental science and relevant applications are not a contradiction, but mutually stimulate each other in both directions.

show abstract

Section: Effective Bubble Force Models Dispersed Bubbly Flow Anmentioning

confidence: 99%

Bubble puzzles: From fundamentals to applications

Lohse

2018

Phys. Rev. Fluids

Self Cite

139

View full text Add to dashboard Cite

show abstract

“…The visual observation method was chosen to distinguish the flow patterns along the straight pipes and through the sharp-angled elbows. This method is routinely employed to characterize the flow patterns and other flow phenomena [38,39,40]. Two mirrors were fixed at 45 • downstream and upstream of the horizontal sharp bend to capture the side and top views of the flow patterns, as illustrated in Several superficial velocities for air and water, j * k =V * k /A * , were used, whereV * k is the volumetric flow rate of air and water, the subscript k=G denotes air and the subscript k=L indicates water, and A * is the crosssectional area of the pipe.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

Al-Tameemi

Riccó

2019

International Journal of Multiphase Flow

View full text Add to dashboard Cite

“…Turbulence remains one of the unsolved scientific problems of contemporary Physics and the Taylor-Couette flow is one of the simple hydrodynamic systems which allows a detailed investigation of the transition to turbulence. In the last decade, new experimental Taylor-Couette facilities (with either rotating inner cylinder or both in corotation or in counter-rotation) have been designed to investigate the ultimate regime of turbulence [Twente, Cottbus, …] which occurs when the boundary layer near cylindrical surface becomes turbulent [12][13][14][15][16][17][18][19][20] . Table 1 presents features of the known Taylor-Couette geometries around the world.…”

Section: Introductionmentioning

confidence: 99%

A large thermal turbulent Taylor-Couette (THETACO) facility for investigation of turbulence induced by simultaneous action of rotation and radial temperature gradient

Singh

Bonnesoeur

Besnard

et al. 2019

Review of Scientific Instruments

View full text Add to dashboard Cite

A thermal Taylor-Couette facility (THETACO) has been designed to investigate turbulent flows generated by differential rotation and radial temperature gradient. It consists of a cylindrical annulus with a rotating inner cylinder and fixed outer cylinder. The electric heating system is installed inside the inner cylinder and the annulus is immersed in a large cylindrical container filled with cooling fluid.Temperature regulators control independently the temperature of the inner surface of the inner cylinder and that of the cooling fluid. The facility allows to reach values of the Reynolds number ( ~ 5 × 10 5 ) and of the Rayleigh number ( ~ 3 × 10 6 ) for water as working fluid. The facility provides torque measurements, a full optical access at the side and from the bottom for velocity measurements using PIV (2D, stereoscopic and tomographic). Temperature measurements in the flow can be performed by thermochromic liquid crystals or laser induced fluorescence.

show abstract

Air cavities at the inner cylinder of turbulent Taylor–Couette flow

Cited by 13 publications

References 38 publications

Bubble puzzles: From fundamentals to applications

Bubble puzzles: From fundamentals to applications

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

A large thermal turbulent Taylor-Couette (THETACO) facility for investigation of turbulence induced by simultaneous action of rotation and radial temperature gradient

Contact Info

Product

Resources

About