SUPERGRAVITATIONAL TURBULENCE
Thermally driven turbulence
Rayleigh
number
Heating water
Atmospheric circulation
Solar troposhere
Aero-engine compressor
Supergravity: An innovative approach to achieving high Ra in the Lab!
- In sheared thermal convection, we found the strong suppression effect of shear on thermal turbulence, and revealed the coupling mechanism between shear and buoyancy, including the instability and scalar transport.
Instability regines
J. Fluid Mech. 2023
Heat transfer
Sheared Thermal Convection
Experimental setup and Schematic diagram
The system could rotate up to 800 rpm, resulting in an effective gravity above 100 times of Earth’s gravity!
- Proposed and developed an experimental setup for supergravitational thermal turbulence, realizing thermal turbulence experiments in the range of more than six orders of magnitude of Rayleigh number.
- This experiment has led to the discovery of a new scaling law for heat transfer, which breaks the limitations of the classical regime and gives direct experimental evidence for the existence of the "ultimate regime".
- Large-scale numerical simulations confirm that the boundary layer under the ultimate regime is a Prandtl-von Kármán type turbulent boundary layer.
Flow structure of Supergravitational thermal turbulence
Ultimate heat transfer scaling
Sci. adv. 2020
Phys. Rev. Lett. 2022
More works are needed:
Members working on this region:
Complex mechanism in the coupling of centrifugal buoyancy, rotation, wall motion, gravity, surfaces, and …
