Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanoscopic spontaneous motion of liquid trains: non-equilibrium
  molecular dynamics simulation   Macroscale experiments show that a train of two immiscible liquid drops, a
bislug, can spontaneously move in a capillary tube because of surface tension
asymmetries. We use molecular dynamics simulation of Lennard-Jones fluids to
demonstrate this phenomenon for NVT ensembles in sub-micron tubes. We
deliberately tune the strength of intermolecular forces and control the
velocity of bislug in different wetting and viscosity conditions. We compute
the velocity profile of particles across the tube, and explain the origin of
deviations from the classical parabolae. We show that the self-generated
molecular flow resembles the Poiseuille law when the ratio of the tube radius
to its length is less than a critical value.

18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph