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The possibility of using coolants modified with high-heat-conducting solid nanoparticles is being considered recently for the intensification of heat transfer in the cooling systems of forced ship and transport internal combustion engines. Modifying by such particles the basic heat carriers, such as water, and aqueous solutions of ethylene glycol, the stable two-phase suspensions are obtained, which have a higher thermal conductivity coefficient than base fluids. The well-known theoretical models describing the viscosity of “liquid-solid particles” suspensions are considered and it is shown that the addition of high-heat-conducting solid nanoparticles to the base heat carrier leads to its dynamic viscosity coefficient increase. The experimental studies of influence the concentration of multigraphene particles on the dynamic viscosity coefficient of suspensions at their different temperatures are carried out using a highly sensitive rheometer, in a measuring cell of which a construction with coaxially arranged cylinders with a double gap is realized. As a result, the relevant regularities are detected. Based on the obtained experimental data and well-known viscosity model, an equation for calculating the dynamic viscosity coefficient of the studied coolants samples at their different temperatures, depending on the mass concentration of multigraphene nanoparticles has been derived. The modification of base coolants with the properties of Newtonian fluid by multigraphene can lead to a change in the rheological behavior of the resulting suspension. The rheological studies on suspensions modified with multigraphene have been carried out and rheological curves of shear stress and dynamic viscosity coefficient versus shear rate have been obtained. As a result, it was established that the presented samples of suspensions are Newtonian liquids, therefore the corresponding hydrodynamic equations and equations characterizing a heat transfer at the “wall cooling liquid” boundary are applied to describe the regularities of heat exchange processes with the presented liquids and the movement features of such suspensions in the cavities of the engine cooling system. Due to a significant increase in the dynamic viscosity coefficient of suspensions modified with multigraphene, we are tasked with detection the possibility of viscosity reducing of such heat carriers while keeping the effect of high thermal conductivity coefficient.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

INFLUENCE OF THE MULTIGRAPHEN NANOPARTICLES CONCENTRATION IN THE HEAT CARRIER OF SHIP AND TRANSPORT PROPULSION PLANTS COOLING SYSTEMS ON ITS VISCOSITY