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2014, vol. 42, br. 2, str. 155-160
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Uticaj procesa hlađenja nanofluidom sastavljenog od vode i Al2O3 nanočestica na prenos toplote konvekcijom
Effects of cooling process of Al2O3-water nanofluid on convective heat transfer
aBrawijaya University Malang, Faculty of Engineering, Mechanical Engineering Department, Malang, Indonesia + Malang State Polytechnic, Mechanical Engineering Department, Malang, Indonesia bBrawijaya University Malang, Faculty of Engineering, Department of Mechanical Engineering, Malang, Indonesia
e-adresa: sudmaji@yahoo.co.id
Sažetak
Rad prikazuje istraživanje prenosa toplote konvekcijom i pad pritiska u nanofluidu korišćenjem nanofluida koji se sastoji od vode i aluminijum oksida u uslovima režima laminarnog strujanja. Ispitivanje je vršeno pomoću cevi dužine 1,1 m i unutrašnjeg prečnika 5 mm kod izmenjivača toplote sa dvostrukom cevi pri konstantnim temperaturama zida. Zagrejani nanofluid teče kroz unutrašnju cev a rashladna voda opstrujava spolja. Zapreminska koncentracija nanočestica je varirala: 0,15%; 0,25% i 0,5%. Eksperiment je pokazao da se prenos toplote konvekcijom značajno povećava sa povećanjem koncentracije nanočestica pri različitim vrednostima Rejnoldsovog broja. Nuseltov broj se povećava oko 40,5% u odnosu na čistu vodu pri zapreminskoj koncentraciji od 0,5%. Pad pritiska u nanofluidu neznatno raste sa porastom zapreminske koncentracije. Međutim, u poređenju sa korišćenjem čiste vode razlika je beznačajna, tako da korišćenje nanofluida ima malog uticaja na pad pritiska.
Abstract
Research has been done to investigate the convective heat transfer and pressure drop of nanofluid, using alumina-water nanofluid under laminar flow regime. The test section was using 1.1 m long and 5 mm inner diameter tube of a double-pipe heat exchanger with constant wall temperatures. The hot nanofluid is flowing inside tube, while the cold water flows outside. The volume concentration of the nanoparticles varied from 0.15%, 0.25% and 0.5%. Experiment shows that the convection heat transfer increases remarkably with the increase of the nanoparticles concentration under various values of Reynolds number. The Nusselt number increases about 40.5% compared to pure water under 0.5% volume concentration. The pressure drop of nanofluid increases slightly with increasing volume concentration. However, compared with using pure water the difference of the pressure drop is insignificant, so that the use of nanofluid has little penalty on pressure drop.
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