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Kratak sadržaj – Predmet istraživanja ovog rada jeste laminarno strujanje nanojonske tečnosti kroz pravu cev kružnog poprečnog preseka. Cilj ovog rada je istraživanje prinudne konvekcije i hidrauličkih karakteristika nanojonske tečnosti. Istraživanje je urađeno primenom računarske dinamike fluida (Computational Fluid DynamicsCFD). Rezultati numeričkih simulacija verifikovani su na dva načina. Prilikom strujanja vode kroz cev, upoređen je pad pritiska dobijen simulacijom sa padom pritiska dobijenim Darsi-Vajbahovim (Darcy Weisbach) izrazom. Prilikom strujanja jonske i nanojonske tečnosti kroz cev, upoređen je Nuseltov broj (Nusselt) dobijen podacima iz simulacija sa Nuseltovim brojem primenom Šahove (Shah’s) jednačine. Primenjeni su kriterijumi kako bi se sagledalo da li predmetnu nanojonsku tečnost ima smisla koristiti u sistemima za prenos toplote. Rezultati numeričke simulacije su uspešno verifikovani, a ispitivani fluid ispunjava kriterijume i može da se koristi u sistemima za prenos toplote kada je masena koncentracija nano čestica 0,5 % i 1 %, a ulazna temperatura ispitivanog fluida 335 K. Ključne reči: Jonska tečnost, nanočestice, nanojonska tečnost, računarska dinamika fluida Abstract – The subject of this research was laminar flow of ionic-nanofluid through a horizontal tube with circular cross-section. The aim of this research was investigating of forced convection and hydraulic characteristics in a straight pipe section using computational fluid dynamics (CFD). Verification of numerical simulation data is executed in two ways: with water flow through a pipe, and comparation between a pressure drop results from simulation and the pressure drop obtained from the Darcy Weisbach equation. Shash's equation was used for calculation of Nusselt's number and it was compared with Nusselt number calculated from CFD simulations results for the purpose of numerical simulation result verification. To check weather using of examined ionic nanofluid is meaningful in heat transfer systems, a few criteria was used. Results of numerical simulations was successfully verified, and it was found that examined fluid meets the criteria for mass concentrations of 0.5 % and 1 % nanoparticles and inlet temperature of fluid T=335 K.

NUMERIČKE SIMULACIJE STRUJANjA NANOJONSKE TEČNOSTI KROZ PRAVU CEV KRUŽNOG POPREČNOG PRESEKA