Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Behavior of Ultrafine Particles in Electro-Hydrodynamic Flow Induced by
  Corona Discharge   Ultrafine particle behavior in electro-hydrodynamic (EHD) flow induced by
corona discharge is studied experimentally and numerically. The EHD flow serves
as a primary particle aspiration/sampling mechanism, the collector does not
require any additional flow generation. Multiphysics numerical model couples
the ion transport equation and the Navier-Stokes equations (NSE) to solve for
the spatiotemporal distribution of electric field, charge density, and flow
field, the results are compared with experimental velocity profiles at the
exit. The computed velocity and flow rate data are in good agreement with the
experimental data; the maximum velocity is located at the axis and ranges from
1 m/s to 4 m/s as a function of corona voltage. Experimentally evaluated
particle transmission trends for ambient and NaCl nanoparticles particles in
the 20 nm - 150 nm range are in good agreement with the theoretical models.
However, for particles in the 10 nm - 20 nm size range, the transmission is
lower due to the increased particle charging resulted from their exposure to
the high-intensity electric field and high charge density in the EHD driven
flow. These conditions yield a high probability of particles below 20 nm to
acquire and hold a unit charge. The transmission is lower for smaller particle
(10 nm) due to their high charge to mass ratio, and it increases as the
single-charged particles grow in mass up to 20 nm, resulting in their lower
electrical mobility. For particles larger than 20 nm, the electrical mobility
increases again as they can acquire multiple charges. The results shed insight
into interaction of nanoparticle and ions in high electrical field environment,
that occur in primary EHD driven flows and in the secondary flows generated by
corona discharge.

17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat