Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes13-8445
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions. 
Creative Commons License

Volume 13 article 334 pages: 235-240

Sudarmadji Sudarmadji
Malang State Polytechnic, Malang - Indonesia

The aim of this experiment was to investigate convection heat transfer in the cooling processes of Al2O3-water nanofluid in concentrations of 0.15%, 0.25% and 0.5% by volume, respectively. The test section was a 1.25 m brass pipe with a 4.9 mm inner diameter and outer pipe of 38.5 mm diameter of a counter flow double-pipe heat exchanger. The temperatures at the nanofluid inlet in the inner pipe were a constant 40oC, and 23oC for the water at the inlet of the outer pipe. The results of this study indicated a more enhanced coefficient convective heat transfer of the cooling process than that of the heating process. The new equation of the Nusselt number obtained in the cooling process was Nunf=0.75Re 0.846 Pr -2.28 φ0.03 at particle volume concentrations of 0.15%, 0.25% and 0.5%. The maximum ratio enhancement of the nanofluid heat transfer in the cooling process was 45.2% at a particle volume concentration of 0.25%, while for the heating process nanofluid heat transfer was same as that for distilled water.

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The authors would like to thank the Ministry of Higher Education of Indonesia for the financial support.

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