 
Summary: J. Fluid Mech. (2005), vol. 536, pp. 145154. c 2005 Cambridge University Press
doi:10.1017/S0022112005005057 Printed in the United Kingdom
145
Heat transport by turbulent RayleighB´enard
convection in cylindrical samples with aspect
ratio one and larger
By DENIS FUNFSCHILLING, ERIC BROWN,
ALEXEI NIKOLAENKO AND GUENTER AHLERS
Department of Physics and iQUEST, University of California, Santa Barbara, CA 93106, USA
(Received 7 February 2005 and in revised form 25 April 2005)
We present highprecision measurements of the Nusselt number N as a function of
the Rayleigh number R for cylindrical samples of water (Prandtl number = 4.38)
with diameters D = 49.7, 24.8, and 9.2 cm, all with aspect ratio D/L 1 (L is the
sample height). In addition, we present data for D = 49.7 and = 1.5, 2, 3, and 6.
For each sample the data cover a range of a little over a decade of R. For 1 they
jointly span the range 107
. R . 1011
. Where needed, the data were corrected for the
influence of the finite conductivity of the top and bottom plates and of the sidewalls
on the heat transport in the fluid to obtain estimates of N for plates with infinite
