Numerical investigation for thermal performance of nanofluid within a parabolic solar collector by using turbulator

Solar energy is one of the types of renewable energy. To use solar radiation, parabolic solar collectors, which are one of the most common collectors, are used. In this paper, the thermal performance of nanofluid is investigated by using a banded strip in a parabolic solar collector. Syltherm -800 nanofluid and aluminum oxide with a volume fraction of 4% were used as working fluid. Nanofluids were studied in the Reynolds number range from 5000 to 25000. The fluid flow in the parabolic solar collector is turbulent, for which the k-ε RNG method has been selected, and non-uniform heat flux is applied to the absorber tube and examined at three different Rim angles. Objective; To investigate the effect of two different geometric parameters of number of revolutions (,) and wing angle (، ,). on the friction coefficient, Nusselt number and thermal efficiency coefficient. The results show that decreasing the wing angle increase the friction coefficient, Nusselt number and thermal efficiency coefficient. Also, increasing the number of revolutions, increases the current turbulence and consequently increases the heat transfer and the Nusselt number.