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High Rayleigh Number Turbulence of a Low Prandtl Number Fluid

  • T. Segawa
  • M. Sano
  • A. Naert
  • J. A. Glazier

Abstract

We have studied the scaling properties of thermal turbulence in a low Prandtl number, Pr, fluid using liquid Hg (Pr = 0.024). The length scale of thermal and viscous boundary layers are analyzed from time series of movable thermistors near the boundary. It revealed that the thermal and viscous layer had crossed over the observed range of Rayleigh numbers (106 < Ra < 108). The frequency spectrum of the temperature fluctuations and the scaling of the cutoff frequency differed from those of He. The cascade range was smaller than expected. Characters of high Rayleigh number flow of a low Prandtl number fluid is discussed.

Keywords

Boundary Layer Nusselt Number Rayleigh Number Thermal Boundary Layer Large Scale Circulation 
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Copyright information

© Springer-Verlag New York, Inc. 1998

Authors and Affiliations

  • T. Segawa
    • 1
  • M. Sano
    • 1
  • A. Naert
    • 1
  • J. A. Glazier
    • 2
  1. 1.Research Institute of Electrical CommunicationTohoku UniversitySendaiJapan
  2. 2.Department of PhysicsUniversity of Notre DameNotre DameUSA

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