Abstract
AbstractThis paper examines the turbulent hydrothermal performance of boehmite/water–ethylene glycol$$(\upgamma -\mathrm{AlO}(\mathrm{OH})/{\mathrm{H}}_{2}\mathrm{O}-\mathrm{EG})$$(γ-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$$\upgamma -\mathrm{AlO}(\mathrm{OH})/{\mathrm{H}}_{2}\mathrm{O}-\mathrm{EG}$$γ-AlO(OH)/H2O-EGnanofluid is modeled using single-phase and$$k-\varepsilon$$k-εmodel. A parametric study is carried out on the effect of Reynolds number ($$5.0\times {10}^{3}\le \mathrm{Re}\le 4.0\times {10}^{4}$$5.0×103≤Re≤4.0×104), the geometry of wire (circular, triangular, square, square-diamond, hexagon, octagon, and decagon), nanoparticle volume ratio ($$0\le \varphi \le 4\%$$0≤φ≤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$$\mathrm{Re}=5.0\times {10}^{3}$$Re=5.0×103, the square CWI has the highest normalized$${\mathrm{Nu}}^{\mathrm{G}}$$NuG(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$${\mathrm{Nu}}^{\mathrm{N}}$$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$$\mathrm{Re}$$Re, as the values of their hydrothermal performance evaluation criteria are greater than unity.
Publisher
Springer Science and Business Media LLC
Subject
Physical and Theoretical Chemistry,Condensed Matter Physics,Polymers and Plastics,Materials Chemistry
Cited by
7 articles.
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