Hydrodynamic stability study in a curved square duct by using the energy gradient method
作者： Hashem Nowruzi , Hassan Ghassemi , S. Salman Nourazar
DOI: 10.1007/S40430-019-1790-Z
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摘要: Curved non-circular ducts have remarkable applications in the macro and micro scales engineering. Stability of flow through curved is a challenging topic context fluid mechanics. In current paper, hydrodynamic stability fully developed 3D steady incompressible 180° square duct investigated via energy gradient method. To this accomplishment, different Dean numbers (De) ranging from 19.60 to 1181.25 at curvature ratio 6.45 are considered. investigate stability, we analyzed distributions velocity, total pressure control parameter function K. Obtained results indicated an appropriate agreement both experimental CFD data. Results our investigation show that maximum Kmax decreased by reduction number. addition, found origin instability (i.e., position Kmax) placed radial between center outer wall azimuthally angular θ < 72°. its cylindrical coordinates corresponding onset under various reported.
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