4. CONCLUSION
Present work investigates thermal-hydraulic performances of turbulent forced hybrid nanofluid flow and heat transfer inside a parabolic through solar collector equipped with the turbulators. The main aim of present work is to simulate the geometry using ANSYS-Fluent-Software and also investigate the effects of different Reynolds numbers and geometrical parameters on thermal and hydraulic characteristics of the studied parabolic through solar collector to achieve the maximum PEC value. The length of the collector is 860 mm and the absorber diameter and glass cover diameter are 50 mm and 80 mm, respectively. Also the inlet length of 600 mm and outlet length of 100 mm are determined because it is important that the inlet flow is fully developed and there be not any flow comeback at exit section of the channel. The absorber system is made of stainless steel 304 with 2mm thickness and the glass cover is made of normal glass with the thickness of 5mm. Also three different Reynolds numbers, Re=2000, 5000 and 8000. For all studied models initial nanofluid temperature is Tinitial= 450K and the solar irradiation of I = 900W/m2is adopted. The heat transfer fluid is water-based MWCNT-Al2O3 (80%:20%) hybrid nanofluid which makes a Newtonian nanofluid. Due to achieving the most efficient Newtonian nanofluid in present study, solid nanoparticles of MWCNT and Al2O3 are added to the base fluid in volume concentration of 0.01 with diameters of 24 nm. A three-dimensional computational fluid dynamic procedure has been established in present investigation to study the turbulent hybrid nanofluid flow and heat transfer performances in the absorber tube and the annulus between absorber tube and glass cover. The RANS equations with the shear-stress (SST) \(k\omega\) turbulence model have been employed for modeling the turbulence regime. The most important results are as follow: