Abstract
An axisymmetric air jet impinging obliquely on a flat wall is visualized by using the oil film method. As a result, a small point of oil film is found to remain in the flow pattern on the wall and proved clearly to be an origin of flow near the wall (O*) by the tuft-stick method. Further, this point is obviously different from the geometrical intersection (O') and the stagnation point (O). In the paper, effects of jet velocity, impinging angle and impinging height on both the distances (λ or δ) between O and O' or O and O* are investigated by using the oil film method.
