Akademik Veri Yönetim Sistemi
International Journal of Thermal Sciences, cilt.214, 2025 (SCI-Expanded)
A novel form of shell and helically coiled heat exchangers, which are widely employed in many applications, have been experimentally and numerically investigated in this work. In the current work, it is aimed to use a cost-effective and simple approach for improving heat transfer in a shell and helically coiled heat exchanger. Accordingly, a shell and helically coiled tube heat exchanger has been modified with a guiding tube and circular fins with the aim of guiding cold flow over the helically coil for enhancing heat transfer rate. In the first step of the study, numerical analyses have been conducted in order to reveal the impact of new modification on the heat transfer. In the next step, a modified heat exchanger with guiding tubes and circular fins has been manufactured and experimentally examined with water and ZnFe2O4/water magnetic nanofluid at different working conditions. The overall results of this study demonstrated how well the modified heat exchanger with circular fins and a guiding tube was designed. Adding a guiding tube into the shell part of the heat exchanger led to moderate the fluid flow and circular fins distributed the flow over the coil which upgraded heat transfer. Experimentally obtained results showed that using ZnFe2O4/water nanofluid in the SHCHE averagely upgraded the heat transfer coefficient as 12.4 %. Moreover, the average deviation between numerically and experimentally obtained outlet temperature is 4.1 %.