Akademik Veri Yönetim Sistemi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.150, sa.23, ss.19657-19676, 2025 (SCI-Expanded, Scopus)
In this paper, thermo-hydraulic performance and entropy generation (EnG) of the teardrop-dimpled tube (DT) was computationally performed under turbulent flow conditions which Reynolds numbers (Re) ranging between 10,000 <= Re <= 50,000 using Fe3O4/H2O ferrofluid (FF) (0 <= phi <= 2.0). The analyses were carried out under constant heat flux conditions of 20 kW/m2. Three sizes and spacing (P = 30, 40, and 50 mm) of the teardrop dimples were investigated parametrically. Moreover, in this study thermo-hydraulic performance and EnG effects were scrutinized for smooth and nine different teardrop DT cases. As a result of the simulations and calculations, the highest performance evaluation criterion (PEC) has been recorded in the case of DT9, and this case performed an increment of 28% at Re = 10,000 compared to the smooth tube (ST). Furthermore, the results showed that the case of DT9 enhanced the heat transfer rate with 38% at Re = 10,000. Considering the results of the second law of thermodynamics, the best total EnG was computed around 31% for DT9 at the Re = 10,000 and phi = 2.0% compared to a ST using H2O as a working fluid. Finally, the deploying of teardrop in the ST has been more effective than the utilization of nanofluids (NFs) compared ST.