TY - JOUR
T1 - Boundary layer length scales in thermal turbulence
AU - Belmonte, Andrew
AU - Tilgner, Andreas
AU - Libchaber, Albert
PY - 1993
Y1 - 1993
N2 - We present measurements of local temperature fluctuations from a convection cell of aspect ratio 1, using gas at room temperature, for Rayleigh numbers (Ra) ranging from 5×105 to 1×1011. The thermal boundary layer thickness is measured; its scaling is close to Ra-2/7 for Ra2×107. A second length scale is measured through the cutoff frequency of the power spectrum, which we relate to the velocity of the large scale circulation. The Rayleigh number dependence of this length changes at Ra=2×109.
AB - We present measurements of local temperature fluctuations from a convection cell of aspect ratio 1, using gas at room temperature, for Rayleigh numbers (Ra) ranging from 5×105 to 1×1011. The thermal boundary layer thickness is measured; its scaling is close to Ra-2/7 for Ra2×107. A second length scale is measured through the cutoff frequency of the power spectrum, which we relate to the velocity of the large scale circulation. The Rayleigh number dependence of this length changes at Ra=2×109.
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U2 - 10.1103/PhysRevLett.70.4067
DO - 10.1103/PhysRevLett.70.4067
M3 - Article
C2 - 10054038
AN - SCOPUS:0001334602
SN - 0031-9007
VL - 70
SP - 4067
EP - 4070
JO - Physical review letters
JF - Physical review letters
IS - 26
ER -