Abstract

The conventional technique for increasing heat dissipation is to increase the surface area for exchanging heat with a heat transfer fluid. However, the conventional enhanced surface technique has reached their limit with regard to improving heat transfer. Meanwhile, a performance of the convective heat transfer depends on the characteristics of the heat transfer fluid. Therefore, researches on nanofluids heat transfer are innovative ways to find alternative heat transfer fluid (coolants) with better performances. This paper presents an experimental study on natural convective heat transfer of water-ZrO2 nanofluids in a triangular and rectangular array of uniformly heated vertical cylinders with pitch to diameter ratio (P/D) of 1.16. The nanofluids were used in this experiment is a colloidal water-ZrO2 and the concentration of nano particles in the solution used by 0.05 %. The study seeks for a new correlation for natural convective heat transfer of water

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