Abstract
Radial heat transports through a rotating fluid annulus, from outer warm wall to inner cold wall, are measured for both the Hadley and the Rossby regimes. Special attention is paid to the dependence on the viscosity of experimental fluid.
As the viscosity increases, the behavior of heat transport in the Hadley regime becomes considerably different from what has been known by several experiments with water. For example, when the viscosity becomes 80 or 100 times larger than that of water, the heat transport (expressed by Nusselt number) near zero angular velocity increases as the angular velocity increases, and it is almost constant for moderate and large angular velocity.
Further, we shall present also how the viscosity affects the transition between the (upper)Hadley and the Rossby regimes.
