Performance Analysis of Aluminium and Copper Helical Coils in SHCTHE Using Cu-Ni Hybrid Nanofluid Under Laminar Flow Regime.

Experiments are conducted under laminar flow conditions. The sol-gel method is used for preparations of copper (Cu) and nickel (Ni) nanoparticle. The prepared Cu-Ni nanoparticles are surface treated to lower the sedimentation after suspending these nanoparticles in pure water. The impact of pitch (0.032, 0.042 and 0.052m), massflow rate, coil material Aluminium (Al) and Copper (Cu), and volume concentration (0.02, 0.04 and 0.06) on heat transfer rate is computed. Reynolds number (Re), Nusselt number (Nu) are computed to evaluate thermal performance of counter flow helical coil heat exchanger. The overall heat transfer coefficient in case of a 12 turn copper coil is increased by 43.71, 52.196 and 60.782% for 0.02, 0.04 and 0.06 % vol respectively compared to distilled water at reynolds number equals to 2224. In this study the best optimal condition to operate shell and helical coil heat exchanger is 0.006% vol at Re=2224. This is due to mass flow rate and reduction in sedimentation of Cu-Ni nanoparticles in distilled water. This is due to flow ate and thermal conductivity of coil material. [ABSTRACT FROM AUTHOR]