Heat transfer augmentation by nano-fluids and circular fin insert in double tube heat exchanger – A numerical exploration

The heat transfer augmentation primary demand in industries like power plant, automobile and process industries for either heating or cooling or evaporation, in particularly in air conditioning, radiators, refrigerators, condensers etc. Such augmentation of heat transfer can either be achieved by passive and active techniques. In this paper the passive approach employed for heat transfer augmentation in double pipe heat exchanger. The four different nano-fluids are considered for the investigation like titanium dioxide nano-fluid, Beryllium oxide or beryllia nano-fluid, zinc oxide nano- fluid and copper oxide nanofluid. The role of nano-fluid is increasing the thermal conductivity of the fluid medium. The circular fin insert used for offering the flow resistance and spread the fluid to surface to enhance the heat transfer. The numerical study is investigating the thermal and flow fields utilizing various types of nano-fluids with circular fin insert in the double pipe heat exchanger. The Finite volume method employed for solve the continuity, momentum and energy equations the ANSYS 15.0 employed for conducting the numerical analysis.