Thermohydraulic analysis of covalent and noncovalent functionalized graphene nanoplatelets in circular tube fitted with turbulators

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

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Abstract

Covalent and non-covalent nanofluids were tested inside a circular tube fitted with twisted tape inserts with 45° and 90° helix angles. Reynolds number was 7000 ≤ Re ≤ 17,000, and thermophysical properties were assessed at 308 K. The physical model was solved numerically via a two-equation eddy-viscosity model (SST k-omega turbulence). GNPs-SDBS@DW and GNPs-COOH@DW nanofluids with concentrations (0.025 wt.%, 0.05 wt.% and 0.1 wt.%) were considered in this study. The twisted pipes' walls were heated under a constant temperature of 330 K. The current study considered six parameters: outlet temperature, heat transfer coefficient, average Nusselt number, friction factor, pressure loss, and performance evaluation criterion. In both cases (45° and 90° helix angles), GNPs-SDBS@DW nanofluids presented higher thermohydraulic performance than GNPs-COOH@DW and increased by increasing the mass fractions such as 1.17 for 0.025 wt.%, 1.19 for 0.05 wt.% and 1.26 for 0.1 wt.%. Meanwhile, in both cases (45° and 90° helix angles), the value of thermohydraulic performance using GNPs-COOH@DW was 1.02 for 0.025 wt.%, 1.05 for 0.05 wt.% and 1.02 for 0.1 wt.%.
Original languageEnglish
Article number17710
Number of pages24
JournalScientific Reports
Volume12
Issue number1
Early online date21 Oct 2022
DOIs
Publication statusE-pub ahead of print - 21 Oct 2022

Keywords

  • Article
  • /639/766/189
  • /639/925/918
  • /639/301/357
  • /639/301/1034
  • article

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