Abstract
The vortex breakdown bubble in confined flow generated by a rotating lid in a closed container with different cross-section geometry has been analyzed experimentally for the case with the height/radius aspect ratio h = 2 and numerically for different aspect ratios. The stagnation point locations of the breakdown bubble emergence and corresponding Reynolds number were determined experimentally and numerically by STAR-CCM+ CFD software for square, pentagonal, hexagonal and octagonal cross-section configurations. The flow pattern and velocity were observed and measured combining the seeding particle visualization and Laser Doppler Anemometry (LDA). The vortex breakdown size and position on the container axis were identified for Reynolds numbers ranging from 1450 to 2400. The obtained results were compared with flow structure in closed cylindrical container. Numerical results shown good agreement with experiment and have allowed to reveal regularities of formation of a vortex breakdown bubble depending on Re and cross-section geometry of confined container.
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