Enhancement of heat transfer using combination of perforated co-swirl twisted tape insert and nanofluids

Abstract

This analysis was carried out for enhancing tube side heat transfer performance by co-swirl twisted tape insert with ethylene glycol-water base TiO2 Nano-fluids. The test section consists of a long copper tube of 26.6 mm internal diameter and 30mm outer diameter and 900 mm effective length. Each stainless steel insert was 850 mm in length, 10 mm in width, 1.5 mm thickness and the twisted ratio was 4.25. For measuring the bulk temperature two thermometers were used at the inlet and outlet section of the circular tube. Four K-thermocouples were used in the experiment section to determine the temperature of the outer surface. From rotameter, a definite amount of mass flow rate was measured for the calculation of flow velocity. As well as from manometer reading, pressure head was measured for determining pressure difference of the flow section. A nichrome wire was surrounded around the pipe for uniform heat flux. Nusselt numbers for i) combination of perforated co-swirl twisted tape insert and 0.03% volume fraction of Nanofluids (TiO2/Ethylene Glycol/Water), ii) combination of perforated co-swirl twisted tape insert and 0.01% volume fraction of Nanofluids (TiO2/EG/Water), and iii) combination of perforated co-swirl twisted tape insert and water were increased by 56.72%, 61.52%, 77.98% respectively than the plain tube.