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About the only effect you would get from putting flour in an empty egg shell and throwing, is you would have a pretty neat little flour bomb...in other words, you'd make a mess.
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It's got to be a lot of fine dust in the air, doesn't even need to be flour at all. But flour silos need to be real careful about sparks 'cos there's a long history of them exploding. For extra research material, read Monstrous Regiment by Terry Pratchett where one of the characters explodes a door out with a flour bomb.
I did lots of sciency stuff as a kid but I can't remember anything interesting now. Just a lot of second-rate crystal sets.