Influence of Ingredients of Carbon Black Nano-Particle Suspension of Ammonia Solution on Viscosity of Nanofluid

A series of experiments were performed on the viscosity of a nanofluid,produced by mixing carbon black and mulsifier OP-10 using ammonia-water with the ultrasonic dispersion.The results show that,when adding surfactant separately in low mass concentrations,at first the viscosity of solution decreases sharply compared with that of ammonia-water,then increases with increasing the concentration of OP-10.In a certain concentration of surfactant,the viscosity of nanofluids increases with increasing the concentration of nanoparticles.Based on Einstein model and Langmuir absorption theory,a new model was summed up for nanofluids.Compared with test values,the calculated values on the new model have verified that the model is suitable to predict the viscosity of nanofluids,because the maximum relative error is less than 5%.Nano-particles absorption in the nanofluids is not only single-molecule layer adsorption,but also multi-layer molecular adsorption and other complicated adsorption.So the new model,only based on single-molecule layer adsorption theory of Langmuir,is not fully in line with the real circumstances.