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Wikipedia definition
1. Granular convectionGranular convection is a phenomenon where granular material subjected to shaking or vibration will exhibit circulation patterns similar to types of fluid convection. It is sometimes described as the Brazil nut effect when the largest particles end up on the surface of a granular material containing a mixture of variously sized objects; this derives from the example of a typical container of mixed nuts, where the largest will be Brazil nuts.
Read “Granular convection” on English Wikipedia
Read “ブラジルナッツ効果” on Japanese Wikipedia
Read “Granular convection” on DBpedia

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