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    Numerical investigation of nanofluid-based flow behavior and convective heat transfer using helical screw
    (Penerbit Akademia Baru, 2024) Khlewee, Abdulqader Sala; Alaiwi, Yaser; Jasim, Talib Abdulameer; Mahdi, Mohammed Alamin Talib; Hussain, Abdullah Jabar; Al-Khafaji, Zainab
    A multitude of industrial and residential customers have utilized heat transfer devices for heat conversion and recovery. For the last fifty years, engineers have diligently endeavored to refine a heat exchanger design that reduces energy use without compromising efficiency. Most techniques for enhancing heat transfer operate by either augmenting the effective heat transfer surface area or inducing turbulence, hence reducing thermal resistance. This work utilized CFD to model Al2O3 and CuO nanoparticles inside the adsorber tube of a parabolic solar collector with N=1 and N=2 turbulators at Re of 20000, 60000, and 100000, respectively, with a turbulence intensity of 5%. The turbulence intensity was determined to be 5% of the total energy of the particles. The inclusion of nanoparticles in the base fluid enhances heat conduction. Consequently, nanofluids are viable options for alternate heat transmission mechanisms. Torsional turbulator models with N=2 have a higher output temperature (Temp) than those with N=1 due to the elevated practical heat level of the N=2 models. The intake temp is elevated from 35 to 46 degrees Celsius due to the existence of CuO nanoparticles in the adjacent turbulator adsorber tubes. The Reynolds number (Re) consistently increases the Nusselt number (Nu). Furthermore, the Nu indicates a higher quantity of CuO nanoparticle models compared to Al2O3 nanoparticle models. Furthermore, CuO nanoparticles exhibit superior efficacy compared to Al2O3 in pressure reduction. In comparison to the N=2 dual-turbulator mode, the N=1 single-turbulator mode exhibits a 34% increase in conflict. Pressure loss coefficients are higher for devices including two turbulators. Across a broad spectrum of Re, the thermal PEC for N=2 models exceeded that of N=1 models by 12 percentage points. CuO nanofluid receivers have better efficacy compared to Al2O3 receivers in the conversion of solar energy into thermal energy. The two-turbulator model, operating at a Re of 100000 and using CuO nanoparticles, attains optimal thermal efficiency. The factor of friction decreases with increasing Re, with Water N=1 showing higher frictional losses than Water N=2, indicating greater turbulence and resistance.