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- W2032090773 startingPage "4643" @default.
- W2032090773 abstract "We consider layers of noncohesive granular materials of mean height $h$ subject to vertical vibration $zphantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}Amathrm{cos}(ensuremath{omega}t)$. Above $ensuremath{gamma}ensuremath{equiv}A{ensuremath{omega}}^{2}/gensuremath{simeq}1$, convection begins, creating a heap of height $L$. We find that for particles of diameter $d<1phantom{rule{0ex}{0ex}}mathrm{mm}$ the pressure $P$ of the surrounding gas plays a key role: $Lphantom{rule{0ex}{0ex}}=phantom{rule{0ex}{0ex}}bmathrm{tanh}(mathrm{KP})+c$, where $b$ and $K$ depend on $h$, the gas viscosity, $d$, $ensuremath{gamma}$, and $A$. Convection is significantly suppressed if the shaker sidewalls are permeable, showing that gas trapped in the granular material is a major source of heaping. We consider criteria to determine when gas effects are relevant." @default.
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- W2032090773 date "1995-06-05" @default.
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- W2032090773 title "Effects of Ambient Gases on Granular Materials under Vertical Vibration" @default.
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- W2032090773 doi "https://doi.org/10.1103/physrevlett.74.4643" @default.
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