Proceedings of the 4 International Symposium on Advanced Materials and Nanotechnology 2020 (iSAMN2020) , 1 - 03 December 2020, pp.185-190
This paper aims to study the entropy generation of CoFe2O4-water nanofluids in minichannels numerically. In the study, the Reynolds number range was chosen with five levels as 4000-20000 and the turbulent flow regime was considered. Pure water was chosen as base fluid and CoFe2O4-water nanofluids were in three different particle volume fractions of 0.25%, 0.5%, and 1.0%. Numerical analyzes were performed for two minichannels with different diameters of 1 mm and 2 mm. The effects of the Reynolds number, nanoparticle concentrations, and minichannel diameters on the frictional entropy generation rates, thermal entropy generation rates, total entropy generation rates, and entropy generation number ratios were numerically analyzed. It was observed that frictional and total entropy generation rates increased as thermal entropy generation rates were decreasing with an increase in particle volume fraction. Also, it was determined that mini channel diameters have a strong effect on thermal entropy generation.