[freebeard]

www.researchgate.net/publication/226210472_Drag_and_lift_reduction_of_a_3D_bluff_bo dy_using_flaps

During the data acquisition, both laser source and camera placed outside the test-section perform the measurements through transparent walls or sufficiently small holes to avoid perturbations of the flow (Fig. 5). The flow is seeded 12 L upstream from the model with olive oil spherical droplets whose average diameter is about 300 lm. The particles have very satisfactory reflection properties. Two Nd:Yag laser sources (120 mJ during a 10 ns pulse) provide double-pulsed light sheets which are approximately 3-mm thick.Images are recorded using a 1,280 91,024 pixels CCD camera. The typical physical dimensions of the PIV images are 400 mm 9500 mm. We use a 16 916 pixels interrogation window with a 25% overlap leading to 4.8 mm spatial resolution. 250 instantaneous velocity fields were recorded to obtain a converged time-averaged velocity field.

Interesting data aquisition via olive oil.