Advancement in Double-Pipe Heat Exchanger Using Turbulators With SiO2 Nanofluids for Energy Storage

Abstract

This research determines the thermal performance factor (TPF) in a double-pipe heat exchanger (DPHE) and establishes a correlation between the parameters. In this study, the effect of dimpled twisted tape (TT) is characterized by a front surface that protrudes and perforations that extend along a tube length of 1500 mm that is investigated using SiO2 as a medium over a range of dimple diameters (D1) and diameter-to-depth ratios (D1/H1) while maintaining a constant twist ratio (TR) of 5.5. This investigation includes six different dimpled TT layouts. The results reveal that the optimum Nusselt number (Nu) is found to be at 3.0 and 4 mm for D1/H1. The optimal friction factor (f) is reached when D1/H1 equals 4.5 and D1 is equal to 2 mm. For a diameter of 4 mm, the best TPF is found at D1/H1 = 4.5. The mixing of the SiO2 nanofluid improved the heat transfer in the dimpled tube inserts because of its radiative characteristics. A contribution to the optimization of heat exchanger design and efficiency is made in the study. The validation of experimental results is accomplished by establishing correlations, which in turn provides insights into the efficiency of heat transport and frictional losses.