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

Abstract : 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 $Ra \sim 10^{10}$. 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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Submitted on : Tuesday, June 5, 2007 - 9:01:29 AM
Last modification on : Thursday, April 19, 2018 - 2:54:04 PM
Long-term archiving on : Thursday, April 8, 2010 - 6:53:47 PM

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  • HAL Id : ensl-00151647, version 1
  • ARXIV : 0706.0594

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Yoann Gasteuil, Woodrow Shew, Mathieu Gibert, Francesca Chillà, Bernard Castaing, et al.. Lagrangian temperature, velocity and local heat flux measurement in Rayleigh-Benard convection. 2007. ⟨ensl-00151647⟩

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