Numerical Study of Heat Transfer in Helical Cone Coil Heat Exchanger Using MWCNT-Water Nanofluid

By using two-phase Eulerian model, authors numerically examined helical cone coil heat exchanger MWNCT/water nanofluid flow and thermal properties. Nusselt number, Reynolds number, heat transfer coefficient, pressure drop in different concentrations, volume fractions, and different flow rates done by using ANSYS fluent software. k-epsilon turbulence model employed in this simulation. By considering heat transfer and pressure drop properties, nanofluid performance factor was assessed. This study utilizes ANSYS multiphase technology to numerically evaluate multi-wall carbon nanotube (MWCNT)/water nanofluids heat transfer and pressure drop as they pass through helically cone coil tube heat exchanger. The authors utilized MWCNT/water nanofluid with 0.1%, 0.3%, and 0.5% particle volume fractions for fluid simulation. The simulations conducted using turbulent flow within 2200 to 4200 Dean number range. Study discovered that highest overall heat transfer coefficient 56% more that of water while using 0.5% nanofluid concentration and 4200 Dean number. Heat transfer coefficient improvement in 0.1%, 0.3%, and 0.5% MWCNT/water nanofluid concentrations correspondingly 17%, 34%, and 47% higher compared to water. The Nusselt numbers show a significant increase of 26%, 49%, and 65% when compared to water, at 0.1%, 0.3%, and 0.5% MWCNT/water nanofluids concentrations, respectively. The pressure decreases of nanofluids with concentrations of 0.1%, 0.3%, and 0.5% were 18%, 33%, and 45% greater than that of water, respectively. ©2024 The authors.