Akademik Veri Yönetim Sistemi
Journal of Thermal Analysis and Calorimetry, 2025 (SCI-Expanded, Scopus)
Nanofluids are known to improve heat transfer in heat exchangers, but different studies have shown that the same nanoparticles may behave differently, even in similar exchangers. Since the diversity of parameters such as nanofluid diversity and Reynolds number discussed in the articles in the literature is limited in each study, the article presented at this point makes a significant contribution to the literature in terms of comparing the performances of many nanofluids in a wide range. In this context, the thermal and hydraulic performance of various water-based nanofluids including Al₂O₃, Fe₃O₄, MWCNT, SWCNT, GO, and a GO–Al₂O₃ (50:50) were experimentally investigated in a Plate Heat Exchanger (PHE) over a Reynolds number range of 1250–6000 and at volume concentrations of 0.01, 0.1, 0.25, and 0.5%. The effects of nanoparticle type and concentration on heat transfer, pressure drop, entropy generation, and thermal performance factor were examined. The results show that the use of nanofluids enhanced the convective heat transfer coefficient, Nusselt number, and effectiveness compared to the base fluid. Among the tested nanofluids, MWCNT showed the highest thermal performance with up to 22% increase in heat transfer coefficient and 65% improvement in effectiveness, while Fe₃O₄ exhibited the lowest performance but caused the highest pressure drop (~ 27%) and 30% more pumping power. The entropy generation analysis revealed that although total entropy increased with nanofluids, MWCNT showed higher thermal entropy but lower frictional losses. The findings indicate that carbon-based nanofluids, particularly MWCNTs, provide superior thermal enhancement with moderate hydraulic penalties, making them promising for PHE applications in energy systems.