Numerical investigation on heat transfer and friction factor characteristics of laminar and turbulent flow in an elliptic annulus utilizing nanofluid

摘要: Abstract In this paper, a numerical investigation on heat transfer performance and flow fields of different nanofluids flows through elliptic annulus in laminar turbulent regimes. The three-dimensional continuity, Navier–Stokes energy equations are solved by using finite volume method (FVM) the SIMPLE algorithm scheme is applied to examine effects characteristics. This study evaluates four types nanoparticles, Al2O3, CuO, SiO2 ZnO, with fractions (0.5–4%) diameters (25–80 nm) under constant flux boundary condition water as base fluid were used. Reynolds number was range 200 ≤ Re ≤ 1500, while for it 4000 ≤ Re ≤ 10,000. results have shown that SiO2–water nanofluid has highest Nusselt number, followed ZnO–water, CuO–water, Al2O3–water, lastly pure water. all cases increases fraction but decreases rise diameter nanoparticles. configurations, number. It found glycerine–SiO2 shows best enhancement compared other tested fluids.