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    NUMERICAL ANALYSIS OF NANOFLUID FLOW IN A CONICAL HELICAL TUBE
    (2022-04) Ali, Majdi Ahmed Misbah
    In this study, nanofluid flow in conical helical tube has been numerically investigated. The study has been carried out in three-dimensional laminar flow (1050?Re?2150) conditions. Conical helical tube with 170 mm base diameter, 10 mm tube diameter and 1500 mm length has been used in the study. Constant heat flux of 1000 W/m2 has been implemented on the tube surface. Al2O3 – water nanofluid with different nanoparticle volume fractions ratio (1.0%, 2.0%, and 3.0%) has also been used as the working fluid in the numerical analyzes. In addition, studies have been carried out for blade, platelet and cylindrical nanoparticle shapes. The average Nusselt numbers and the average Darcy friction factors have been used to estimate the flow and heat transfer characteristics of nanofluid flow in the conical helical tubes with different nanoparticle volume fractions and shapes. Pressure and temperature distribution inside the conical helical tubes have been also examined for different cases. Secondary flows in conical helical tubes have been analyzed in detail. Numerical results of the study have been also presented as the variation of average Nusselt number and Darcy friction factor with Reynolds number, nanoparticle shape and nanoparticle volume fraction. As a result, the highest convective heat transfer performance has been obtained for platelet nanoparticle shape of the 3.0% Al2O3-water nanofluid. ?