Copper oxide nanofluid has been prepared by single-step wet chemical precipitation method. The preparation of nanofluid is carried out by reducing copper chloride with sodium hydroxide as reducing agent in deionised water as base fluid by means of conventional heating. The characterization of sample nano powder is done by X-ray diffraction (XRD), EDXA, SEM, and TGA. The mean size of the particle was determined from the XRD pattern by using the Scherrer formula and the average particle size was found to be 20 nm. Also an increase in thermal conductivity of the prepared copper oxide nanofluid was found to be 12.4 % compared to deionised water.

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Heat pipes are two-phase heat transfer devices with high effective thermal conductivity. The performance of the heat pipe is greatly depends on the filling ratio of the working fluid. An experimental set up was made fro m a copper tube with an inner diameter of 20.8 mm and outer diameter 22 mm. The Di-water is used as a working fluid. The temperatures at different places on the heat pipe were measured including the temperature of in let and outlet of the cooling water. The results indicate that the variation of filling ratio, heat input and angle of inclination has a significant effect on its performance.