Analiza toplotne provodljivosti nanofluida Al2O3/voda-etilen glikol korišćenjem faktorskog dizajna eksperimenata u aparatu za prenos toplote sa prirodnom konvekcijom Naučni rad
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Toplotna provodljivost fluida za prenos toplote ima značajnu ulogu u poboljšanju performansi razmenjivača toplote. U ovom radu eksperimenti su izvedeni u aparatu za prenos toplote sa prirodnom konvekcijom mešanjem homogenizovanih nanočestica Al2O3 u osnovnom fluidu koji predstavlja smešu voda-etilenglikol. Analizirani su efekti unosa toplote, zapreminskog sadržaja nanočestica u osnovnom fluidu i zapreminskog udela etilenglikola u osnovnom fluidu na toplotnu provodljivost nanofluida. Na osnovu rezultata dobijenih pomoću programskog paketa MINITAB® (matrica faktorskog dizajna), izvedeno je 16 eksperimentalnih ciklusa sa nižim I višim nivoima ulaznih faktora. Nivoi za unos toplote bili su 10 i 100 W; za zapreminski sadržaj nanočestica u osnovnom fluidu 0,1 i 1,0 vol.% i za sastav osnovnog fluida 30 i 50 vol.% etilenglikola u vodi. Iz dobijenih eksperimentalnih rezultata kostruisani su Pareto dijagram, dijagram normalne verovatnoće, konturni grafikon i površinski grafikon. Na osnovu rezultata predložena je nova korelacija, a predviđanja su upoređena sa eksperimentalnim rezultatima. Iz studije je uočena maksimalna vrednost toplotne provodljivosti od 0,49 W m-1K-1 pri zapreminskom sadržaju nanočestica u osnovnom fluidu i od 1,0 vol.%, zapreminskom udelu etilenglikola u osnovnom fluidu od 30 vol.% i unosu toplote od 100 W.
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