Dye in oil shows the streamlines of plane potential flow past an NACA 64A015 airfoil at 13° angle of attack. However, because the Hele-Shaw flow cannot show circulation, the Kutta condition is not enforced at the trailing edge. Hence infinite velocities are represented there. The model is between glass plates 1 mm apart. Wale 1973. Reproduced, with permission, from the Annual Review of Fluid Mechanics, Volume 5. 1973 by Annual Reviews Inc.
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