Synopsis: Heat and twist of turbulent flows

Turbulent flow around cylinders can tell us plenty about physics of fluids on earth and in astrophysical systems.
Synopsis figure
Credit: M. Paoletti et al., Phys. Rev. Lett. (2011)

Turbulent flow is driven by heat transport in Rayleigh-Bénard convection, and by angular velocity transport in Taylor-Couette flows. Whereas the former involves a liquid confined in a temperature gradient between a hot and a cold plate, the latter comprises a fluid confined between two concentric and independently rotating cylinders. In order to better explain many naturally occurring and industrial fluid flows, it is imperative to gain an advanced understanding of both these types of transport.

Two groups writing in Physical Review Letters reveal new results that make a step in this direction. Matthew Paoletti and Daniel Lathrop at the University of Maryland, US, and Dennis van Gils and co-workers at the University of Twente, Netherlands, simultaneously and independently measured the transport properties of Taylor-Couette flows at extremely high Reynolds numbers and reveal the transport of angular momentum between two independently rotating concentric cylinders. Paoletti and Lathrop study the interplay between shear and global rotation in the system, mimicking conditions ubiquitous in astrophysical phenomena. These results could help explain, for instance, the matter inflow towards compact objects and planetary formation. Meanwhile, van Gils et al. show that their results obey a universal scaling law that exactly resembles the ultimate scaling law for heat transport in Rayleigh-Bénard convection in the strongly turbulent regime, highlighting the analogy between these two forms of transport. – Deniz van Heijnsbergen


More Features »


More Announcements »

Subject Areas

Fluid Dynamics

Previous Synopsis

Semiconductor Physics

Band together

Read More »

Next Synopsis

Related Articles

Synopsis: Saturn-Shaped Drops
Fluid Dynamics

Synopsis: Saturn-Shaped Drops

An electric field can pull apart a millimeter-sized oil drop, causing it to shed thin rings from its equator that then break up into tiny droplets. Read More »

Synopsis: Bacteria Never Swim Alone
Biological Physics

Synopsis: Bacteria Never Swim Alone

Simulations and theory indicate that the “synchronized swimming” of bacteria occurs in much sparser suspensions of the microorganisms than expected. Read More »

Synopsis: Instant-Freeze Water
Fluid Dynamics

Synopsis: Instant-Freeze Water

Laser pulses can turn liquid water into an exotic type of ice within a few nanoseconds. Read More »

More Articles