The Analysis of Experimental Process of Production, Stabilizing and Measurement of the Thermal Conductivity Coefficient of Water/Graphene Oxide as a Cooling Nanofluid in Machining

The abrasion is a significant issue, especially in machining of rigid steels. A functional and suitable approach for enhancing the heat transfer from machining area is using an intermediate fluid with higher heat transfer potential instead of common fluids. The objective of this experimental study is to discuss production, stability and thermal conductivity examination of water/graphene oxide nanofluid considered as a new nanofluid used in machining process instead of common coolant. In this research, for thermal conductivity enhancement of a basic fluid (Deionized water), a nanofluid development method composed of two steps as well as particles of nano dimension consisting water/graphene oxide is used. Producing 16 different nanofluid samples, the sample having a higher stability than others is considered for examining the thermal conductivity. The Zeta potential measurement is used in order to precisely determine stability of the final sample of water/graphene oxide nanofluid. Considering the obtained results, a highly acceptable level of stability is concluded. In addition, the transient hot wire method as well as thermal analyzer system is used to measure the heat transfer coefficient of water/graphene oxide nanofluid. According to the obtained results, the thermal conductivity of water/graphene oxide nanofluid in most states has increased to 71% compared to the base fluid. It is also observed that water/graphene oxide nanofluid has a high heat transfer potential. Utilizing this nanofluid enhances the heat transfer, improves the surface quality and reduces the damages caused by machining instrument.