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I'm wondering if a say 1/2" thin wire but rigid multicolored tuff grid (tuffs attached at nodes on the grind), say 24" square, mounted perpendicular to air flow might give a clearer picture of airflow
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Try 1-2 thousandths of an inch.
I've had some time to search be not much success:
www.researchgate.net/figure/Tuft-flow-visualization-in-the-wind-tunnel-experimental-vein-highlighting-the-area-of_fig3_292208380
This was in a wind tunnel. I know I've seen a picture of a 6x6ft grid hitch-mounted behind a moving vehicle, but I can't prove it.
Cumbersome, only works trailing the vehicle; it may show the size of the wake but not the extent.
I like the idea of tiny, smoke-filled soap bubbles.