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    ENERGY ANALYSIS AND ENTROPY PRODUCTION OF BINARY NANOFLUID FLOWING IN ELLIPTICAL DIMPLED TUBE MOUNTED IN PARABOLIC SOLAR COLLECTOR
    (2022-09) Mohammed, Noor Adil Mohammed
    In this study, a three-dimensional analysis of the PTC receiver tube containing elliptical dimples, with different ratios (0.66-1.66) has been performed. The flow type has been considered turbulent, and the Reynolds number is chosen between 10000 to 30000. The inlet temperature has been considered to be constant at 500 K, and C++ code has also been developed to perform a non-uniform heat flux on the outside of the receiver tube to approximate real life standards. The types of mono and hybrid nanofluids and their combinations with different NPVF are 2%TiO2/Syltherm800, 2%Al2O3/Syltherm800, 1.0%TiO2-1.0%Al2O3/Syltherm800 ,1.5%TiO2-0.5%Al2O3/Syltherm800, and 0.5%TiO2-1.5%Al2O3/Syltherm800. The study provides a detailed analysis of the energy performance, entropy generation, coefficient of friction (ff), Nusselt number (Nu) and thermal efficiency of PTC. Contours of the velocity and temperature distribution inside the receiver tube for PTC are also given. The results of the study show that hybrid nanofluid 1.5% Al2O3-0.5% TiO2/Syltherm 800 is chosen as the best heat transfer fluid. It was also defined that PEC increases by 27% when ER= 5/3 elliptical ratio receiver tube is used. With increasing Re from 10000 to 30000 reduces the entropy generation rate by 52%. The lowest entropy generation rate has been obtained for the case of using 0.5%TiO2-1.5%Al2O3/Syltherm800 hybrid nanofluid flowing inside the receiver tube containing dimples with elliptical ratio of ER=5/3 by 1.25% when compare it with smooth receiver at Re =30000.
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    Exergetic, Energetic, and entropy production evaluations of parabolic trough collector retrofitted with elliptical dimpled receiver tube filled with hybrid nanofluid
    (Pergamon-Elsevier Science Ltd, 2023) Pazarlioglu, Hayati Kadir; Ekiciler, Recep; Arslan, Kamil; Mohammed, Noor Adil Mohammed
    In this paper, a numerical study was performed on a parabolic trough collector receiver tube containing elliptical dimpled fins with different elliptical ratios (ER = 0.66-1.66) under turbulent flow regime. The C++ code was developed to perform a non-uniform heat flux on outside of the receiver tube to get approximation real working conditions. Different mono and hybrid nanofluids and their combinations with different nanoparticle volume fractions (2.0 %TiO2/Syltherm800, 2.0 %Al2O3/Syltherm800, 0.5 %TiO2-1.5 %Al2O3/Syltherm800, 1.0 %TiO2-1.0 %Al2O3/Syltherm800, and 1.5 %TiO2-0.5 %Al2O3/Syltherm800) were used as a working fluid. The study provides a detailed analysis of the hydro-thermal characteristics, exergetic, and entropy production of the parabolic trough collector. 1.5 %Al2O3-0.5 %TiO2/Syltherm800 hybrid nanofluid shows the best increase in results obtained in this study using elliptical ratio of a/b = 5/3. The use of the elliptical ratio of a/b = 5/3, the average Nusselt number increases with 38 % compared to the receiver tube without elliptical dimpled fin. Total entropy generation was reduced up to 16.82 % for the elliptical ratio of a/b = 5/3. With the inserting elliptical dimpled fins of a/b = 5/3, the Performance Evaluation Criterion was detected as 1.81 compared to while the thermal efficiency increases from 74 % to 80 % at the lowest Reynolds numbers.