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Inclined turbulent thermal convection by large Rayleigh numbers in extremelysmall-Prandtl-number fluids is studied based on results of both, measurementsand high-resolution numerical simulations. The Prandtl number $Pr\approx0.0093$considered in the experiments and the Large-Eddy Simulations (LES) and$Pr=0.0094$ considered in the Direct Numerical Simulations (DNS) correspond toliquid sodium, which is used in the experiments. Also similar are the studiedRayleigh numbers, which are, respectively, $Ra=1.67\times10^7$ in the DNS,$Ra=1.5\times10^7$ in the LES and $Ra=1.42\times10^7$ in the measurements. Theworking convection cell is a cylinder with equal height and diameter, where onecircular surface is heated and another one is cooled. The cylinder axis isinclined with respect to the vertical and the inclination angle varies from$\beta=0^\circ$, which corresponds to a Rayleigh-B\'enard configuration (RBC),to $\beta=90^\circ$, as in a vertical convection (VC) setup. The turbulent heatand momentum transport as well as time-averaged and instantaneous flowstructures and their evolution in time are studied in detail, for differentinclination angles, and are illustrated also by supplementary videos, obtainedfrom the DNS and experimental data.  To investigate the scaling relations of the mean heat and momentum transportin the limiting cases of RBC and VC configurations, additional measurements areconducted for about one decade of the Rayleigh numbers around $Ra=10^7$ and$Pr\approx0.009$. With respect to the turbulent heat transport in inclinedthermal convection by low $Pr$, a similarity of the global flow characteristicsfor the same value of $RaPr$ is proposed and analysed, based on the abovesimulations and measurements and on complementary DNS for $Ra=1.67\times10^6$,$Pr=0.094$ and $Ra=10^9$, $Pr=1$.

Inclined turbulent thermal convection in liquid sodium