Yükseköğretim Kurumları Destekli Proje, 2019 - 2020
One of the most important technical applications is heat transfer in fluid dynamics. In this influence domain, liquid metals have an increasing interest as heat transfer medium such as in condensed sun and nuclear power stations. The liquid metals with low Prandtl number have gained increasing interest due to high thermal dissipations when comparing with air and water because they supply high heat fluxes. Moreover, these fluids endure high temperatures. With these reasons, liquid metals are taken into consideration at applications of nuclear technology and condensed sun for heat transfer and heat storage. In this study, heat transfer and flow structure of backward-facing step flow with turbulent that is important at many devices like inner and outer flow of heat storage containers or collectors of power conversion systems by using carbon based nanofluids with different concentrations will be numerically investigated. While one of the walls behind the backward-facing step is heated, other walls are adiabatic. In work, continuity, momentum and energy equations by employing ANSYS-FLUENT computer software program which is finite volume method with k-ε turbulent model. After the comparisons with results obtained from liquid sodium at work existed in literature are done, GO-distilled water with volumetric concentrations of 0.01% and 0.02% and MWCNT-distilled water with 0.01% volumetric concentration nanofluids whose thermophysical properties are experimentally obtained will be used. Different geometries will be considered as backward-facing step geometry and the effect of different Re numbers on the fluid will also be searched. Besides, the effect of buoyancy forces acting on fluid at the heated wall on the flow structure and heat transfer will be evaluated in the work.