Heat exchangers have its major application in automobile, air condition, refrigerator,\npower plants, and many others. Heat transfer characteristics and\nperformance of Copper spiral heat exchanger are investigated and compared\nwith pure water. Nanofluid can enhance thermos-physical properties. Experiment\nis carried out for water based SiO2 Nanofluid with 15 nm average\nsized nanoparticle at varying air velocity and mass flow rate of fluid to investigate\nits effect on heat transfer coefficient. From the experimental data, a\nclosed form solution for Nusselt number has been calculated using ����
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