Quantitative visualization of swirl and cloud bubbles in Taylor–Couette flow
- 159 Downloads
We develop a novel method to study the gas phase features in a bubbly Taylor–Couette flow when bubbles are arranged as elevated toroidal strings. The flow is recorded in the front view plane with a high-speed camera for a Reynolds number of 1500 and a global void fraction of 0.14 %. An image processing algorithm is developed to discriminate bubbles accumulated in clouds near the inner cylinder (cloud bubbles) from bubbles trapped in the bulk flow by vortices (swirl bubbles). The analysis of the preferential positions, azimuthal velocities, and equivalent void fraction of clouds and swirl bubbles separately provides a new insight into the dynamics of the bubble’s entrapment.
KeywordsBubbly Taylor–Couette Flow visualization Algorithm Discrimination
- Chouippe A, Climent E, Legendre D, Gabillet C (2014) Numerical simulation of bubble dispersion in turbulent Taylor-Couette flow. Phys Fluids Am Inst Phys 26(4):043304:1–22Google Scholar
- Fokoua GN, Gabillet C, Aubert A, Colin C (2015) Effect of bubbles arrangement on the viscous torque in bubbly Taylor-Couette flow. Phys Fluids 27:034105-1–034105-34Google Scholar
- Mehel A, Gabillet G, Djeridi H (2006) Bubble effect on the structures of weakly turbulent Couette Taylor flow. J Fluids Eng 128(4). doi: 10.1115/1.2201641
- Oppenheim A, Schafer RW, Buck JR (1989) Discrete-time signal processing. Prentice-Hall, Englewood Cliffs, pp 311–312Google Scholar