This paper presents results of an experimental investigation of convective heat transfer in mercury confined by two horizontal plates, heated from below, and spun about its vertical axis. The experiments covered a range of Rayleigh numbers between 1.1(10)6 and 5.17(10)7, and Taylor numbers from 0 to 7.75(10)10. The Prandtl number was practically constant. The results indicate that for low spin rates, up to a certain critical value of Taylor number, the change in the heat-transfer coefficient is insignificant and the equation derived for the stationary case can be used. The critical Taylor number is given by  
Above the critical Taylor number, the heat-transfer coefficient may be computed from the relationship  
In this equation the characteristic dimension of length, for Nu, Ra, and Taylor numbers, is the distance between plates.
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