Abstract
This paper presents an experimental study on heat transfer characteristics in a double-pipe heat exchanger using different types of fluid. The nanofluid consists of zirconia was added to the base fluid (deionized water and Ethylene Glycol). The concentration of nanofluid was varied with a range of 0.2, 0.7 and 1.2 % and the flow rates of the base and nanofluid were varied with a range of 1.5, 1.8 and 2.1 L/min. The results indicated that the Ethylene Glycol has the highest Nusselt number (40.70) at inlet temperature (70 °C) and flow rate (2.1 L/min) among the other working fluids. The mixture of ethylene glycol and water has Nusselt number lower than that for number at (φ =1.2 %, temperature=70 °C and flow rate 2.1 L/min) and Reynolds number is (the Ethylene Glycol alone. From the experimental result it is clear that the Nusselt number of nanofluid increases with an increase in the concentration and flow rate. It was found that (24.2) of Nusselt 3679). The maximum heat transfer enhancement is (1.5077) for ethylene glycol at inlet temperature (70 °C) and the minimum enhancement is (0.16844) for ethylene glycol at temperature (40 °C).
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