INVESTIGATION THE EFFECT OF CONCURRENT IMPLEMENTATION OF HYBRID NANOFLUID AND MODIFIED INSERTS ON THERMOHYDRAULIC PERFORMANCE OF A HEAT EXCHANGER TUBE

Abstract

This study aimed to enhance the thermal performance of a heat exchanger tube by employing a hybrid nanofluid comprising graphene-iron oxide nanoparticles and modified helical inserts. Three different forms of inserts, namely, barrel-type, hourglass-type, and flat-type, were tested, and the nanofluid was prepared by incorporating the nanoparticles at three different weight ratios, 0.50%, 0.75%, and 1.00%, into a water-ethylene glycol mixture. Prior to the experiments, the methodology of the study was validated, and the characteristics of hybrid nanofluids were determined. The experiments were conducted in the Reynolds number range from 3000 to 15,000, ensuring turbulent flow conditions. The study found that the optimal configuration for the highest thermohydraulic performance (THP) value was the 1.00% hybrid nanofluid weight ratio, the barrel-type insert with a P/D ratio of 0.5, and a Reynolds number of 3000. All configurations tested exhibited a thermohydraulic performance value exceeding 1, indicating improved thermohydraulic performance The findings of the study contribute to the understanding of heat transfer and fluid flow characteristics in heat exchangers, providing valuable insights for the design and optimization of such systems.