Phys. Rev. Lett. 99, 234302 (2007) [4 pages]Lagrangian Temperature, Velocity, and Local Heat Flux Measurement in Rayleigh-Bénard ConvectionReceived 5 June 2007; published 6 December 2007 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-Bénard convection, at Ra∼1010. 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.234302
DOI:
10.1103/PhysRevLett.99.234302
PACS:
44.27.+g, 47.80.−v
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