Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
SILVER-PVP DISPERSANT NANOFLUIDS FOR THE AUTOMOTIVE COOLING SYSTEM APLICCATION
Submission Author:
Edwin Martin Cardenas Contreras , MG
Co-Authors:
Edwin Martin Cardenas Contreras, Felipe Silva dos Santos, Erick Oliveira do Nascimento, ENIO PEDONE BANDARRA FILHO
Presenter: Edwin Martin Cardenas Contreras
doi://10.26678/ABCM.COBEM2021.COB2021-0629
Abstract
An alternative proposed to intensify the thermal performance of the radiator is the use of nanofluids. This fluid class with enhanced thermal properties has shown great potential to replace the conventional fluids used, such as water (H2O) and ethylene glycol (EG). In this work, the thermohydraulic performance of silver nanofluids using a mixture of water and ethylene glycol (50:50) as base fluid in an automotive radiator is presented. The two-step production method was used to disperse the nanoparticles at low weight concentrations, 0.01 wt%, 0.02 wt% and 0.03 wt%, in the base fluid. For further dispersion and stability of the nanoparticles in the base fluid, polyvinylpyrrolidone (PVP) surfactant was used. To evaluate stability, the UV-VIS spectrophotometry method was used relating the variation in absorbance and concentration according to Beer-Lambert's law. Thermophysical properties such as thermal conductivity, specific mass, and dynamic viscosity were also evaluated experimentally. The experimental setup consists of a wind tunnel, which simulates the airflow through the radiator, and a hot fluid circuit, which simulates the thermal load transferred from the engine to the coolant fluid. Influence on the heat transfer rate of parameters such as nanofluid concentration and inlet temperature were evaluated experimentally. The air velocity was kept constant at 2 m/s and the coolant mass flow rate was varied from 70 g/s to 90 g/s. Finally, with an increase of on average 3.5 % in the heat transfer rate, it can be concluded that the nanofluids obtained in the test conditions analyzed a thermohydraulic performance favorable for their application.
Keywords
Heat transfer, Nanofluid, Radiator, thermophysical properties
