Investigation of Forced Convection Heat Transfer Efficiency Using Cuo/Water Nanofluid in A Concentric Tube Heat Exchanger with Helical Coiled Insert

Abstract

An apparatus that uses nanofluid to transport heat is called a heat exchanger. This uses a nanofluid as the working fluid. One can make nanofluid hanging nanoparticles in liquids such as petroleum products, water, oil, ethylene glycol, fluorocarbons, etc. Forced convection heat transfer using CuO/water as a Nanofluid and distilled water as the base fluid has been examined in a concentric tube heat exchanger with helical coiled insert. Tests on plain tubes and tubes with inserts have been carried out to determine “heat transfer, frictional factor, and thermal performance factors in a Reynolds number of ranges of 3000 to 11000 with volume concentrations that include 0.010, 0.0150, and 0.020%” of nanofluid. Evidently, the rate of heat transfer increases as the volume percentage and pitching ratio of the CuO/water nanofluid do. Furthermore, compared to a plain copper tube, a copper tube with an alternating arrangement of helix-coiled inserts and a copper oxide-based nanoscale fluid performs better in terms of heat transfer. The best thermal performance factor of 1.23 is demonstrated in this experiment by use of CuO/water nanofluid at volumes concentrations more than 0.020% in copper tubes connected with helical coil insert at spacing ratio (p/d=2) in parallel structure, with Reynolds number of 3713.930.