Lagrangian temperature, velocity and local heat flux measurement in Rayleigh-Benard convection

Details Lagrangian temperature, velocity and local heat flux measurement in Rayleigh-Benard convection Lagrangian temperature, velocity and local heat flux measurement in Rayleigh-Benard convection

2007-06-05

arxiv.org/abs/0706.0594v1

PRL 99, 234302 (2007)

Physics

Fluid Dynamics

4 pages

Scientific paper

10.1103/PhysRevLett.99.234302

We have developed a small, neutrally buoyant, wireless temperature sensor. Using a camera for optical tracking, we obtain simultaneous measurements of position and temperature of the sensor as it is carried along by the flow in Rayleigh-B\'enard convection, at $Ra \sim 10^{10}$. We report on statistics of temperature, velocity, and heat transport in turbulent thermal convection. The motion of the sensor particle exhibits dynamics close to that of Lagrangian tracers in hydrodynamic turbulence. We also quantify heat transport in plumes, revealing self-similarity and extreme variations from plume to plume.

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