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1

Coaxial Circular Jet Flows with Conical Attachments

100%

Inan A., Gul M., Isikan M.

Acta Physica Polonica A

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2015

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vol. 127

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issue 4

1373-1379

EN

This study is devoted to experiments on jet flows, which have many application areas. It shows the obtained jet flow structure. The experiments were carried out in a subsonic sucking wind tunnel having cross-section of 32×32 cm², length of 75 cm, and turbulence densities of 0.5%. One-channel hot-wire anemometer (HWA) was used in measurements. For circular jet, a steel pipe was used with a length of 120 cm and a diameter of 8 mm. Air generator was used for generating air into the jet flow and measurements were done at different jet flow velocities. Moreover, a conical diffuser with a length of 21 cm and 6° slope was attached to the nozzle exit and effect of this diffuser on jet flow was examined. Seven types of measurement in three different categories were carried out. In experimental studies, velocity and turbulence distribution, axial velocity variation, jet half widths and, using these, jet diffusion rates and angles were measured. Moreover, flow analyses were done by drawing moment and frequency distribution for measurement sensitivity. These experimental results were compared with the studies on jet flow.

2

Experimental Investigation of Turbulent Flow Field at Downstream-Facing Round Nosed Pier

100%

Günal M., Ismael A.

Acta Physica Polonica A

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2016

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vol. 130

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issue 1

126-127

EN

Bridge pier in a flow induce turbulence and vortices that increase the risk of sediment bed scouring. The turbulent flow field around downstream-facing round nosed pier in a scoured bed was examined experimentally. The opposite bridge pier was embedded in a non-uniform soil with d₅₀=1.45 mm and σ_{g} =3.16. Experiments were carried out under live-bed condition. Flow velocities were measured with acoustic Doppler velocimeter. Measurement was conducted at the pier front. Result shows that the time-average velocity field, turbulent intensities and turbulent kinetic energy at different depths and distances from the original bed level differs. These results are benefiting for validation of three-dimensional flow model and turbulence close to the bridge pier.

3

Investigation of Grooved Circular Jet Flow Experimentally and Using Computational Fluid Dynamics

70%

Inan A., Sisman T.

Acta Physica Polonica A

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2015

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vol. 127

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issue 4

1145-1149

EN

This study is the investigation of grooved circular jet flow experimentally and using computational fluid dynamics (CFD). Experimental studies were conducted by using straight circular and grooved circular tubes in a multi-purpose low-range subsonic wind tunnel. Single channel hot wire anemometer was used in turbulence measurements. Numerical studies for the solution of jet flow were performed through FLUENT program (ANSYS 14.5). Jet flow profiles at different velocities were formed by using the data generated at predetermined stations in the experiment room for the straight circular tubes and grooved circular tubes. After transferring the experimental data to Fluent, jet exit points of the circular tubes were placed in the quarter model to coincide with the initial coordinates of experimental room. CFD Calculations were done by implementing different velocities in the experimental room and the jet. Jet flow structures obtained from both computational and experimental calculations are shown in graphs and the data is presented in Tables. The obtained parameters are as follows: axis velocity (U_{e}), root mean square velocity (U_{rms}), turbulence velocity (U_{turb}), jet half width (b) and Reynolds numbers (Re_{D} and Re_{b}). These parameters were calculated with reference to jet radius and jet half width. Graphics formed by the generated non-dimensional data were compared to the previous studies.

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3 Acta Physica Polonica A

1 2016

2 2015

2 Inan A.

1 Gul M.

1 Günal M.

1 Isikan M.

1 Ismael A.

1 Sisman T.

Coaxial Circular Jet Flows with Conical Attachments

Experimental Investigation of Turbulent Flow Field at Downstream-Facing Round Nosed Pier

Investigation of Grooved Circular Jet Flow Experimentally and Using Computational Fluid Dynamics