Q1. What is the name of the effect whereby a spoon is deflected by a flow of water passing over the outer surface of the spoon? Grok-3 Answer - The Coandă effect.
Q2. Does the Coandă effect occur in a vacuum with an inert safe flowable powder that is flowing under the action of gravity.?
Q3. Has anyone done this experiment to observe what happens with flowing powder?
Q4. How would such an experiment be designed?
Q2: It works as long as you can make the powder flow laminarly along the spoon. If nothing pushes the powder from a direction perpendicular to the spoon's profile so that powder remains near the spoon, as air pressure does in atmosphere with air or water flows, I think that powder would get scattered by spoon's surface with no effect.
Q3: not to my knowledge
Fabio Garufi Dear Professor Garufi. Thank you for your contribution. Your response to Q3 is telling. Physics is all about experiment, so perhaps there is a suitable challenge here for one of your students to undertake?
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