Modifying liquids with nanoparticles is widely recognized as a practical approach for improving their heat transfer characteristics without significantly increasing viscosity. This work examines the effect of adding hematite and acid-leached blast furnace sludge particles on the rheological and thermal properties of deionized water. The investigated fluids were prepared by dispersing a certain amount of hematite and leached blast furnace sludge particles in distilled water using a sonicator. The modifier content in the liquid varied up to 5 wt%. Pristine iron oxides with particle sizes of approximately 5 micrometers and 50 nanometers were used as model systems. Leached sludge particles were deagglomerated for an extended period prior to measurement. The rheological behavior of the fluids was studied using an FRS 1600 furnace rheometer system designed for viscosity measurement from 1 mPa·s, and the specific heat capacity of hematite and leached blast furnace sludge was obtained by SENSYS EVO TG-DSC calorimeter equipped with 3D-sensor technology. Furthermore, the characterization of the prepared liquids was also supported by the results of SEM analysis. The results of this study provide the foundation for the use of leached blast furnace sludge as a potential heat transfer fluid.Keywords: Heat transfer fluid, iron oxides, blast furnace sludge, viscosity, specific heat capacity
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