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YEMENİCİ, ONUR

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    Publication
    Experimental evaluation of wind loads on a ground-mounted solar panel of various ground clearances and Reynolds numbers
    (Springer, 2021-12-01) Yemenici, Onur; YEMENİCİ, ONUR; Mühendislik Fakültesi; Makine Mühendisliği Bölümü; GKS-5251-2022
    The wind loads on a stand-alone solar panel and flow field behind the panel were experimentally investigated in a wind tunnel under the influence of ground clearance and Reynolds number. The experiments were carried out at the chord Reynolds number of 6.4x10(4), 9.6x10(4), and 1.3x10(5) encompassing turbulent flows and dimensionless ground clearance of 0, 0.5 and 0.6. The velocity and turbulence intensities were measured by a constant-temperature hot wire anemometer, and a pressure scanner system was used to static pressure measurements. It was found that the wind loads on the solar panel increased with ground clearance, while changed within a range of the uncertainties of the method with Reynolds number. So, the design-relevant wind loads were independent of the Reynolds number for the present test configurations, but they were significantly affected by the ground clearance. The velocity profiles demonstrated that the length of the recirculation region behind the panel increased with the reduction of the ground clearance, while decreased from the middle of the panel to the near edges, which is consistent with the pressure measurements.
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    Experimental and numerical investigation of the effect of horseshoe vortex legs on heat characteristics of the downstream region of a circular cylinder-wall junction
    (Pergamon-Elsevier Science, 2021-12) Fıratoğlu, Zeynel Abidin; Yemenici, Onur; Umur, Habib; YEMENİCİ, ONUR; UMUR, HABİB; Makine Mühendisliği Bölümü; GKS-5251-2022; CDQ-7721-2022
    The present study was investigated experimentally and numerically the effect of horseshoe vortex (HV) legs on the wall heat transfer in a turbulent boundary layer in the downstream region of a circular cylinder-wall junction. The experiments were carried out at three Reynolds number, ReD = 20,0 0 0, 40,0 0 0, and 60,0 0 0 (based on the cylinder diameter and the free-stream velocity) encompassing the turbulent region, while numerical simulations were performed at ReD= 20,0 0 0 only. In the studies carried out, the ratio of cylinder diameter to boundary layer thickness at ReD = 20,0 0 0, 40,0 0 0, and 60,0 0 0 at the point where the cylinder is placed is 2.44, 3.20, and 3.37, respectively. A constant-temperature anemometer and copper-constant thermocouples were used for measurements of velocity and turbulent intensity, and temperature, respectively. The results showed that the flat surface in the downstream region of a circular cylinder-wall junction increased the Stanton number up to 43% compared to the flat surface without cylinders. Furthermore, the increase in the Stanton number at the saddle point at the end of the downstream region of the HV legs showed a peak, while the increase at the separation line point at the beginning of the upstream region is found to be minimum. Another finding observed is that the increase in the Stanton number decreases dramatically from the end of the downstream region of the HV leg to the origin of the upstream region.