Abstract
Thermal performance development, heat transfer structure, and flow behavior in the heat exchanger square duct equipped with a 45° inclined square ring are investigated numerically. The effects of flow blockage ratios and spacing ratios for the inclined square ring on fluid flow and heat transfer are considered. The Reynolds number (Re = 100–2000, laminar regime) based on the hydraulic diameter of the square duct is selected for the present work. The numerical domain of the square duct inserted with the 45° inclined square ring is solved with the finite volume method. The SIMPLE algorithm is picked for the numerical investigation. The heat transfer characteristics and flow topologies in the square duct inserted with the inclined square ring are plotted in the numerical report. The heat transfer rate, pressure loss, and efficiency for the square duct placed with the inclined square ring are presented in forms of Nusselt number, friction factor, and thermal enhancement factor, respectively. As the numerical results, it is detected that the heat transfer rate of the heat exchanger square duct inserted with the inclined square ring is around 1.00–10.05 times over the smooth duct with no inclined square ring. Additionally, the maximum thermal enhancement factor for the heat exchanger square duct inserted with the inclined square ring is around 2.84.
Highlights
Introduction e effort to develop the thermal performance of the heat transfer system in various industries and engineering devices had been considered by many researchers. e improvement of the heat transfer rate and thermal performance in the heat exchanger can be done by two methods. e first method is called “active method.” e active method requires additional power, such as vibration, to improve heat transfer rate
Chamoli et al [20] numerically investigated the thermal performance augmentation in a circular tube with novel anchor-shaped vortex generators for the Reynolds number around 3000–18,000. ey concluded that the heat transfer rate and friction loss for the circular tube with the novel anchor-shaped vortex generators are higher than the plain tube around 2.24–4.56 and 4.01–23.23 times, respectively. ey found that the maximum thermal enhancement factor for the circular tube with the novel anchor-shaped vortex generators is around 1.72
Chamoli et al [24] illustrated the convective heat transfer in a circular tube fitted with perforated vortex generators. e effects of the perforation index and relative pitch length on heat transfer and thermal performance in the tested tube were considered for Re 3000–21,000. ey found that the circular tube with perforated vortex generators provides the maximum thermal enhancement factor around 1.65. e multiobjective shape optimization of a heat exchanger tube fitted with compound inserts was reported by Chamoli et al [25]
Summary
Thermohydraulic Performance Improvement in Heat Exchanger Square Duct Inserted with 45° Inclined Square Ring. Ermal performance development, heat transfer structure, and flow behavior in the heat exchanger square duct equipped with a 45° inclined square ring are investigated numerically. E heat transfer rate, pressure loss, and efficiency for the square duct placed with the inclined square ring are presented in forms of Nusselt number, friction factor, and thermal enhancement factor, respectively. The maximum thermal enhancement factor for the heat exchanger square duct inserted with the inclined square ring is around 2.84. Chamoli et al [20] numerically investigated the thermal performance augmentation in a circular tube with novel anchor-shaped vortex generators for the Reynolds number around 3000–18,000. E inclined square ring (ISR), like the baffle or thin rib, is selected to improve heat transfer rate and performance in the heat exchanger square duct.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
