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We investigate the dependency of the magnitude of heat transfer in aconvection cell as a function of its inclination by means of experiments andsimulations. The study is performed with a working fluid of large Prandtlnumber, $Pr \simeq 480$, and at Rayleigh numbers $Ra \simeq 10^{8}$ and $Ra\simeq 5 \times 10^{8}$ in a quasi-two-dimensional rectangular cell with unitaspect ratio. By changing the inclination angle ($\beta$) of the convectioncell, the character of the flow can be changed from moderately turbulent, for$\beta = 0^o$, to laminar and steady at $\beta = 90^o$. The global heattransfer is found to be insensitive to the drastic reduction of turbulentintensity, with maximal relative variations of the order of $20\%$ at $Ra\simeq 10^{8}$ and $10\%$ at $Ra \simeq 5 \times 10^{8}$, while the Reynoldsnumber, based on the global root-mean- square velocity, is strongly affectedwith a decay of more than $85\%$ occurring in the laminar regime. We show thatthe intensity of the heat flux in the turbulent regime can be only weaklyenhanced by establishing a large scale circulation flow by means of smallinclinations. On the other hand, in the laminar regime the heat is transportedsolely by a slow large scale circulation flow which exhibits large correlationsbetween the velocity and temperature fields. For inclination angles close tothe transition regime in-between the turbulent-like and laminar state, aquasi-periodic heat-flow bursting phenomenon is observed.

Robustness of heat-transfer in confined inclined convection at high-Prandtl-number