Tuft flow visualization
Tuft flow visualization is a technique used to capture the instantaneous flow pattern formed by the tufts (light and flexible) stuck on to the model surface. The orientation of tufts with respect to the freestream flow clearly indicated the flow features like flow separation, reattachment and recirculation region.
Tufts- Polyester and cotton sewing threads glue
Major mile stones / results of this technique
Tuft flow pattern on GA(W)-2 swept wing