Thermo-hydraulic performance investigation of triple-tube heat exchanger with MXene-based various shape hybrid nanofluids

Abstract

The present investigations theoretically explored MXene-based dissimilar-shaped nanoparticle (CuO spherical, MWCNT cylindrical, Al2O3 blade, graphene platelet, and Fe3O4 brick shapes) hybrid nanofluids by 1% v/v, in a triple-tube heat exchanger (TTHX). The shape and surface effect thermophysical properties of nanofluids have been specified using a user-defined function. The operating fluid mass flow rate and temperature of inner (water), intermediate (hybrid nanofluids), and outer tubes(water) are 0.1kg s−1 at 30 ºC, 0.1–0.5kg s−1 at 70◦C, and 0.1kg −1s at 20 ºC, respectively. The comparative thermal performance (effectiveness, heat transfer, thermal enhancement factor, London factor, etc.), exergetic analysis (entropy production, exergy destruction, etc.), and cost–benefit ratio (CBR) have been explored. MXene-spherical hybrid nanofluid is 5.16% more efficient than water at 0.1kg s−1 in the TTHX system. MXene-cylindrical hybrid nanofluid exhibits 11.23% and 12.69% better heat transfer and performance index than DI water at the lowest mass flow rate in the TTHX system. MXene-platelet hybrid nanofluids show a reduced Nusselt number ratio for the tested mass flow rates. Entropy generation in MXene-cylindrical hybrid nanofluid is 24.11% lower than in DI water.The highest thermal performance factor (TPF) of MXene-cylindrical hybrid nanofluid in the TTHX is 1.65. The MXene-cylindrical hybrid nanofluid is the most economical in the TTHX system, followed by the MXene-brick hybrid nanofluid. Overall, Mxene-cylindrical hybrid nanofluids perform best in the TTHX system in terms of heat transfer rate, TPF, and CBR in the TTHX system. © Akadémiai Kiadó, Budapest, Hungary 2024.