Investigation of forced convective heat transfer with magnetic field effect on water/ethylene glycol-cobalt zinc ferrite nanofluid

In this work, the magnetic field effect on the convective heat transfer (CHT) properties of nanofluids comprising cobalt–zinc ferrite nanoparticles were experimentally studied. The nanofluid was prepared by dispersing the cobalt–zinc ferrite nanoparticles in the water and ethylene glycol mixture (80:20) and subjected to heat transfer studies. The experiment result exhibited that the CHT coefficient increased with the increase in the nanofluid concentration. The maximum CHT coefficient exhibited at a concentration of 0.2 wt%, which was improved by about 23.9%. It was also found that the CHT coefficient at a magnetic field of 750 G was increased by about 2.64% compared to that at 0 G for 0.2 wt% cobalt–zinc ferrite nanofluid concentration. The nanofluid with 0.2 wt% cobalt–zinc ferrite concentration exhibited the maximum CHT coefficient and pressure drop increase rate by 17% when the magnetic field was increased from 0 to 750 G. •Cobalt–zinc ferrite nanofluid was prepared with 80:20 ratio of water and ethylene glycol as a base fluid.•Increase in nanofluid concentration increases the convective heat transfer coefficient.•Nanofluid with 0.2 wt% cobalt–zinc ferrite concentration exhibited the maximum CHT coefficient and pressure drop increase rate.