Heat transfer enhancement and pressure drop in two-phase flow boiling using coiled wire as turbulent promoters: A review
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This 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 ) / H 2 O - 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 ) / H 2 O - EG nanofluid is modeled using single-phase and $$k-\varepsilon$$ k - ε model. 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 × 10 3 ≤ Re ≤ 4.0 × 10 4 ), 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 × 10 3 , the square CWI has the highest normalized $${\mathrm{Nu}}^{\mathrm{G}}$$ 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 $${\mathrm{Nu}}^{\mathrm{N}}$$ Nu N (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.
This 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 ) / H 2 O - 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 ) / H 2 O - EG nanofluid is modeled using single-phase and $$k-\varepsilon$$ k - ε model. 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 × 10 3 ≤ Re ≤ 4.0 × 10 4 ), 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 × 10 3 , the square CWI has the highest normalized $${\mathrm{Nu}}^{\mathrm{G}}$$ 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 $${\mathrm{Nu}}^{\mathrm{N}}$$ Nu N (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.
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