EXPERIMENTAL AND NUMERICAL STUDIES ON WATER FLOW THROUGH RECTANGULAR CROSS-SECTIONAL AREA S-SHAPED DIFFUSERS | ||||
| ERJ. Engineering Research Journal | ||||
| Article 7, Volume 38, Issue 4, October 2015, Page 309-325 PDF (1.52 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2015.66853 | ||||
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| Authors | ||||
| K. A Ibrahim1; W. A El-Askary1; I. M Sakr1; Hamdy A Omara2 | ||||
| 1Mechanical Power Engineering Department, Faculty of Engineering, Menoufiya University, Shebin El-Kom, EGYPT | ||||
| 2Higher Institute of Engineering &Technology, Arish, North Sinai | ||||
| Abstract | ||||
| The paper presents comprehensive experimental and numerical studies on water flow through rectangular S-shaped diffusers. The experimental setup was designed and constructed to perform the measurements which have been carried out on twelve models of S-shaped diffusers. The measurements of pressure distributions along the outer and inner walls of the S-shaped diffuser were performed for different parameters including area ratios, curvature ratios, inflow Reynolds numbers, turning angles (45◦ /45◦ , 60◦ /60◦ , 90◦ /90◦ ), and flow paths (45◦ /45◦ , 60◦ /30◦ , 30◦ /60◦ ). The energy-loss coefficients for each model are based on detailed measurements of the wall pressure distributions along walls of the S-shaped -diffuser models including long upstream and downstream tangents. The energy-loss coefficient data were plotted as a function of Reynolds number for the tested models at different geometrical parameters. The experimental data for different S-diffuser configurations have been used for assessing credibility of the numerical code using different turbulence models. High performances of computations with turbulence closure provided by the standard k-ε model have been carried out for prediction of the performance of S-diffusers at different inflow and geometrical conditions. The results showed that the diffuser energy-loss coefficient is strongly affected by the geometrical parameters of S-shaped diffuser and inflow Reynolds number. Increasing area ratio, curvature ratio, and inflow Reynolds number increase the diffuser performance. The turning angle plays an important role in improving the S-shaped diffuser performance. But, the diffuser performance decreases, when the turning angle is larger than 60° and the flow path changes far than the symmetric path (45°/45°). | ||||
| Keywords | ||||
| Water flow; Diffuser performance; Turn angle; Energy losses; S-Shaped diffusers | ||||
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