RT journal article
T1 Controlling secondary flows in Taylor-Couette flow using axially spaced superhydrophobic surfaces
A1 Jeganathan, Vignesh
A1 Shannak, Tala
A1 Alba, Kamran
A1 Ostilla Monico, Rodolfo
A2 Ingeniería Mecánica y Diseño Industrial
K1 mixing enhancement
K1 Taylor-Couette flow
K1 turbulence control
AB Turbulent shear flows are abundant in geophysical and astrophysical systems and in engineering-technology applications. They are often riddled with large-scale secondary flows that drastically modify the characteristics of the primary stream, preventing or enhancing mixing, mass and heat transfer. Using experiments and numerical simulations, we study the possibility of modifying these secondary flows by using superhydrophobic surface treatments that reduce the local shear. We focus on the canonical problem of Taylor-Couette flow, the flow between two coaxial and independently rotating cylinders, which has robust secondary structures called Taylor rolls that persist even at significant levels of turbulence. We generate these structures by rotating only the inner cylinder of the system, and show that an axially spaced superhydrophobic treatment can weaken the rolls through a mismatching surface heterogeneity, as long as the roll size can be fixed. The minimum hydrophobicity of the treatment required for this flow control is rationalized, and its effectiveness beyond the Reynolds numbers studied here is also discussed.
PB Cambridge University Press
SN 0022-1120
YR 2023
FD 2023-08-15
LK http://hdl.handle.net/10498/31419
UL http://hdl.handle.net/10498/31419
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-may-2026