Rheological and Thermal Transport Characteristics of a Transformer Oil Based Ferrofluid

Abstract

Ferrofluids based on insulating liquids are intensively studied as a potential substitute of liquid dielectric in high voltage technologies. In this work we focus on the experimental investigation of flow and thermal transport characteristics of a ferrofluid based on transformer oil (Mogul) and iron oxide nanoparticles. The magneto-rheological behavior of the ferrofluid was studied by a rotational rheometer in the shear rate range from 1 to 1000 s ¡1 and magnetic field up to 1 T. By means of a thermal constants analyzer and a transient plane source method we obtained the thermal conductivity, specific heat and thermal diffusivity values for the studied oil and the ferrofluid. It is shown that the Newtonian character of the ferrofluid changes to a non-Newtonian with application of the magnetic field. The notable magneto-viscous effect has been observed especially at low shear rates. We found that the doping of the transformer oil by 3 wt% of the nanoparticles results in a thermal conductivity enhancement by about 3.2%.

A mathematical analysis of mass transfer phenomena with chemical reaction over the flow of Sisko ferronanofluid across a permeable surface

“…In the domains of nautical technology, aviation, bioliquids, and medicinal and fibre manufacturing, it has a wide range of applications. To enhance microscale mass transfer, a dilute Ferrofluid is employed along with a non-uniform magnetic flux major objective of the work was the experimental investigation of the fluid and thermally transport characteristics of a ferrofluid depending on turbine oil and iron nanomaterial, magnetic field application 17 , 18 . The flow of MHD nanofluids made of water and kerosene over a porous surface with a predetermined heat flux is examined 19 .…”