Thermal analysis of v-cut twisted tape fitted heat exchanger: A numerical approach

In this study, an investigation of the impact of use of plain twisted tape and a V-cut twisted tape in tube on heat transfer rate and pressure drop is done. To generate the vortex flow in the fluid domain the use of twisted tape is more effective. The flow analysis done by using numerical technique. Subsequently, the thermal performance characteristics of these configurations were examined. The analysis has been performed on three-dimensional incompressible flow. The study uses the k-omega (SST) turbulence model. A v-cut twisted tape is axially inserted and immersed in the tube. Laminar to turbulent is the range. Laminar to turbulent flow is first explored in plain tube. Results were validated by comparing pre-existing associations. Compared to the plain design, the v-cut design increases heat rate significantly. Wider cuts generate more recirculation flow in addition to vortex flow. Heat increases as twist ratio lowers. The heat transfer rate at lower twist ratio of 2 is greater than that at higher twist ratios of 3, 5, and 7 for all Reynolds numbers. A twisted tape with V-cut creates vortex flow, which, along with secondary flow through the cuts, increases turbulence. Enhanced turbulence mixes fluid layers between the pipe's inner lining and fluid core.