Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Connection between the mass flow rate and the base and bulk normal
  stresses in silo discharge   The discharge of polydisperse grains in a two-dimensional silo, operating in
a continuous-discharge mode, is studied with the help of soft-particle discrete
element simulations. We find that the mass flow rate displays similar variation
with vertical normal stress at the base and the transition-point in the bulk,
signifying that the base normal stress can be considered as a representative of
its bulk counterpart. The variation of the base and transition-point normal
stresses with fill height follows the Janssen's model, with the former being
larger than the latter. The transition-point ($y_t$) is defined as the vertical
extent of Region of Orifice Influence (ROOI), which is situated directly above
the orifice in its neighbourhood. The transition-point occurs largely at the
same location irrespective of the fill height. It shifts, however, upon
changing the orifice size, indicating its occurrence to be a localized
phenomenon. Finally, the scaling of the vertical velocities at the
transition-point and outlet uncovers $y_t$ to be a more relevant length scale
than the orifice size $D$. This scaling provides a new insight into the
dynamics of the silo discharge in the case where the flow rate varies but the
normal stress stays largely invariant to change in the orifice size.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
16
The categories of this paper are: stat