In recent years, modern technologies have permitted the manufacturing of metallic particles down to the nanometer scale, which in turn created a new class of fluids, called nanofluids. Nanofluid is the promising heat and mass transfer medium which nanoparticles are well and stably dispersed in the base fluid. It has been known that the thermal conductivity of the nanofluids is considerably higher than that of the corresponding base fluids [22,23]. The enhancement depends on some factors such as particle shape, particle size, volume fraction of particles, and thermal properties of solid and liquid. In spite of the interesting potential and features of nanofluids, these rather special fluids are still in their early development stage. Even though the available data provides interesting insight into nanofluid properties and heat transfer benefits, a considerable amount of research remains to be done on this fascinating subject and the development of the field faces several challenges. The research is concerned about the measurement of thermal conductivity of some nanofluids and study of some factors such as temperature and volume fraction on the results.

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