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    FLOW AROUND A SQUARE PRISM AND A CIRCULAR CYLINDER IN TANDEM ARRANGEMENT
    (TECH UNIV LIBEREC, FAC MECHANICAL ENG, 2010) Akansu, Yahya Erkan; Yavuz, Tahir; Sarioglu, Mustafa; Vit, T; Dancova, P
    Aerodynamic characteristics of flow around two bluff bodies of square and circular section in a tandem arrangement have been investigated experimentally at a Reynolds number of 2.2 x 10(4). Experiments were carried out in a wind tunnel for the various values of distance between the bodies in the range of 1 <= L/D <= 10. The upstream square prism side length and downstream circular cylinder diameter were equal to 25 mm. By using pressure transducer and hot-wire anemometer, mean pressure distributions and vortex-shedding from the square prism and circular cylinder were examined. Drag and lift coefficients were obtained from the integration of the pressure distributions. The Strouhal numbers of the test models were determined from the frequency analysis of the velocity fluctuations. A single smoke-wire was set in front of the bodies and the flow structure at the mid-span of test section was visualized at Re=7.0x10(3). Depending on the distance between the bodies, the positions of flow attachments, separations, reattachments and the structures of the vortex formation region have been clearly obtained from the flow visualization. According to the results, there are three basic flow structures in the case of the two tandem body arrangement depending on the distance between the bodies. These are "pattern I: single body behavior", "pattern II: shear layer reattachment" and "pattern III: vortex shedding between two bodies".
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    Flow field and heat transfer characteristics in an oblique slot jet impinging on a flat plate
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Akansu, Yahya Erkan; Sarioglu, Mustafa; Kuvvet, Kemal; Yavuz, Tahir
    An experimental study was performed to determine the effects of inclination of an impinging two dimensional slot jet on the heat transfer from a flat plate. Local Nusselt numbers and surface pressure distributions were determined depending on inclination angle, jet-to-plate spacing and Reynolds number. The results showed that the location of maximum heat transfer was mainly due to the angle of inclination. As the inclination angle increases, the location of the maximum heat transfer shifts towards the uphill side of the plate and the value of the maximum Nusselt number gradually increases at lower jet-to-plate spacings. (C) 2008 Elsevier Ltd. All rights reserved.