凯发

As a new type of heat transfer fluid, graphene/water-based nanofluid has an important role in the field of heat transfer enhancement and energy saving. To solve the current contradictory problems of power consumption due to enhanced thermal conductivity and increased viscosity in the practical application of water-based nanofluids. In this paper, we designed and selected different structured polymeric aqueous solutions with viscoelasticity as nanofluidic base fluid, and obtained stable graphene/water-based nanofluid by high-pressure homogeneous dispersion. The molecules of the base fluid interact with graphene particles through hydrogen bonding to form a “graphene film” on the surface of the molecules, which weakens the intermolecular interaction of the liquid. When the fluid is subjected to the force, the nanoparticles are easily aligned in the direction of shear, and as a lubricating material, the friction is weakened which leads to the reduction of the viscosity of the base fluid, and graphene shows significant viscosity reduction for different base fluids, and the viscosity reduction rate is up to 99.6%, and the viscosity is close to that of pure water. The viscosity reduction effect provides a convenient and effective way to solve the problem of increasing viscosity due to the addition of nanoparticles and the subsequent increase in energy consumption during use. The thermal conductivity of graphene/water-based nanofluid is 38.7% higher than that of pure water, and the comprehensive heat transfer performance enhancement ratio (PER) value is close to 0, indicating that the new nanofluid has the largest heat transfer enhancement effect. The nanofluid prepared in this paper not only has excellent thermal conductivity, rheological properties and stability, but also has a simple preparation process, low cost and eco-friendly, which is very promising for industrial applications. It also provides a useful reference for the preparation of other new nanofluids.