Nanotechnology Reviews (Mar 2023)

Thermohydraulic performance of thermal system integrated with twisted turbulator inserts using ternary hybrid nanofluids

  • Alawi Omer A.,
  • Kamar Haslinda Mohamed,
  • Falah Mayadah W.,
  • Hussein Omar A.,
  • Abdelrazek Ali H.,
  • Ahmed Waqar,
  • Eltaweel Mahmoud,
  • Homod Raad Z.,
  • Al-Ansari Nadhir,
  • Yaseen Zaher Mundher

DOI
https://doi.org/10.1515/ntrev-2022-0504
Journal volume & issue
Vol. 12, no. 1
pp. 267 – 79

Abstract

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Mono, hybrid, and ternary nanofluids were tested inside the plain and twisted-tape pipes using k-omega shear stress transport turbulence models. The Reynolds number was 5,000 ≤ Re ≤ 15,000, and thermophysical properties were calculated under the condition of 303 K. Single nanofluids (Al2O3/distilled water [DW], SiO2/DW, and ZnO/DW), hybrid nanofluids (SiO2 + Al2O3/DW, SiO2 + ZnO/DW, and ZnO + Al2O3/DW) in the mixture ratio of 80:20, and ternary nanofluids (SiO2 + Al2O3 + ZnO/DW) in the mixture ratio of 60:20:20 were estimated in different volumetric concentrations (1, 2, 3, and 4%). The twisted pipe had a higher outlet temperature than the plain pipe, while SiO2/DW had a lower T out value with 310.933 K (plain pipe) and 313.842 K (twisted pipe) at Re = 9,000. The thermal system gained better energy using ZnO/DW with 6178.060 W (plain pipe) and 8426.474 W (twisted pipe). Furthermore, using SiO2/DW at Re = 9,000, heat transfer improved by 18.017% (plain pipe) and 21.007% (twisted pipe). At Re = 900, the pressure in plain and twisted pipes employing SiO2/DW reduced by 167.114 and 166.994%, respectively. In general, the thermohydraulic performance of DW and nanofluids was superior to one. Meanwhile, with Re = 15,000, DW had a higher value of η Thermohydraulic = 1.678.

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