Numerical simulation of pool boiling heat transfer using silica-water, copper oxide-water, and aluminum oxide-water nanofluids on a vertical brass cylinder

Heat transfer in fluids is of great importance. There are several methods to improve heat transfer. One of these methods is the use of nanofluids. Given the widespread use of brass metal in nuclear reactor cores, water-cooled electronic devices, and refrigeration systems and equipment, this research aims to improve heat transfer, increase the convective heat transfer coefficient, and increase the heat flux compared to pure water by numerically simulating the heat transfer of a brass cylinder immersed in a fluid-filled pool. For this purpose, after modeling the geometry, with the help of software ANSYS Fluent (v. 2022 R1), meshing is performed for the modeled geometry, and by applying the conservation equations and energy, and applying the properties and initial and boundary conditions, the heat transfer time and thermohydraulic properties of the problem are obtained. The base fluid used is pure water, which has been converted into a nanofluid by adding silica nanoparticles, copper nanoparticles, and aluminum nanoparticles to it. New properties obtained from the combination of base fluid and nanoparticles with any volume fraction have been introduced into the software. In this research, first, simulation is performed with the properties of the base fluid (pure water), then simulation is performed with the properties obtained for each of the volume fractions of nanofluids. The simulation results show that the heat transfer of the nanofluid has changed compared to pure water, such that at small volume fractions (0.05), the results show less growth, but at volume fractions (0.1 and 0.15), the results show a growth of over 15%, but in the silica water nanofluid at a density of (0.05), better heat transfer occurs.