Selimefendigil F.Oztop H.F.Abu-Hamdeh N.H.2024-07-222024-07-22201913886150http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/14606Analysis of mixed convection due to a rotating inner cylinder in a corrugated three-dimensional cavity filled with carbon nanotube-water nanofluid was performed. Numerical simulations were performed by using Galerkin weighted residual finite element method. The three-dimensional corrugated cavity was differentially heated form the vertical surfaces, and an inner rotating adiabatic cylinder was used. Influence of Rayleigh number (between 10 4 and 10 6 ), angular rotational velocity of the cylinder (between − 50 and 50 rad/s), height (between H / 10 and H / 3) and number of triangular waves (between 1 and 16) and solid nanoparticle volume fraction (between 0 and 0.04) on the convective heat transfer characteristics was analyzed. It was observed that average heat transfer augments significantly by changing the nanoparticle volume fraction and up to 128% of enhancement is obtained. Depending on the rotational direction of the cylinder, average Nusselt number enhances 68 % in the three-dimensional cavity. Surface corrugation parameters are not as effective as solid particle volume fraction and angular rotational speed of the cylinder on the heat transfer enhancements. Finally, a correlation for the average Nusselt number along the cold surface was provided which is dependent upon the angular rotational speed of the cylinder and Rayleigh number. © 2018, Akadémiai Kiadó, Budapest, Hungary.EnglishCarbon nanotubesCylinders (shapes)Mixed convectionNanometalsNanoparticlesNumerical methodsNusselt numberVolume fractionYarnAverage heat transfersConvective heat transferCorrugated wallHeat Transfer enhancementNanofluidsNanoparticle volume fractionsRotating cylindersThree dimensional cavityNanofluidicsArticle10.1007/s10973-018-7068-3