Thermal conductivity of water base Ni-np@MWCNT magnetic nanofluid

Thermal conductivity behavior of a nanofluid constructed from encapsulated nickel nanoparticles inside multiwall carbon nanotubes (Ni-np@MWCNT) under various conditions of weight percentage, base fluid temperature as well as external magnetic field was studied experimentally. Ni-np@MWCNT nanoparticles were made by chemical process and various analyses such as XRD, VSM and TEM were implemented for characterizing their properties. The thermal conductivity of Ni-np@MWCNT nanofluid at different conditions of the nanoparticles weight percentage was surveyed as we found that there is an almost regular relevance between the increase in thermal conductivity and the concentration of nanoparticles of the nanofluid. We also investigated the role of nanofluid temperature as an effective parameter in thermal conductivity as we found a relative growth of thermal conductivity in all considered samples with increasing temperature. The results also show that the magnetic field can dramatically control the thermal conductivity of Ni-np@MWCNT nanofluids. The outcomes obtained in this work can be used to produce smart devices based on magnetic nanofluids.

Automated summary

This study experimentally investigated the thermal conductivity behavior of a nanofluid containing nickel nanoparticles inside multiwall carbon nanotubes (Ni-np@MWCNT) under different conditions. The results showed that the thermal conductivity of the nanofluid can be manipulated by the weight percentage of nanoparticles, fluid temperature, and external magnetic field.