Hydrothermal performance of a turbulent nanofluid with different nanoparticle shapes in a duct fitted with various configurations of coiled-wire inserts

This paper examines the turbulent hydrothermal performance of boehmite/water-ethylene glycol (gamma - AlO(OH)/H2O - EG) nanofluid flowing through a square duct fitted with various coiled-wire inserts (CWIs) using the finite volume method. The turbulent flow of gamma - AlO(OH)/H2O - EG nanofluid is modeled using single-phase and k - E model. A parametric study is carried out on the effect of Reynolds number (5.0 x 10(3) = Re = 4.0 x 10(4) ), the geometry of wire (circular, triangular, square, square-diamond, hexagon, octagon, and decagon), nanoparticle volume ratio ( 0 = f = 4% ), and nanoparticle shapes (blade, brick, cylinder, platelet, and oblate-spheroid) on hydrodynamic and convective heat transfer performance (CHTP). The results showed that the combination between CWI and nanofluid enhances hydrothermal performance. For instance, among the geometries of CWI considered at Re = 5.0 x 10(3) , the square CWI has the highest normalized Nu(G) (referencing empty channel) of 2.58, while the decagon has the lowest value of 1.78. Furthermore, regarding the nanoparticle shapes, the platelet shape has a maximum normalized NUN (referencing base fluid) of 1.53, while the oblate-spheroid has a minimum value of 0.93. Lastly, in terms of application, square and octagon wire-fitted channels are better than empty channel at low Re , as the values of their hydrothermal performance evaluation criteria are greater than unity.

Automated summary

This paper investigates the turbulent hydrothermal performance of boehmite/water-ethylene glycol nanofluid flowing through a square duct with various coiled-wire inserts. The study examines the effect of Reynolds number, wire geometry, nanoparticle volume ratio, and nanoparticle shapes on hydrodynamic and convective heat transfer performance. The results show that the combination of coiled-wire inserts and nanofluid enhances hydrothermal performance.