Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Liquid-jet instability at high pressures with real-fluid interface
  thermodynamics   The injection of liquid fuel at supercritical pressures is a relevant topic
in combustion, but usually overlooked. In the past, the wrong assumption
whereby the liquid experiments a fast transition to a supercritical state was
made, thus neglecting any role of two-phase interface dynamics in the early
stages of the atomization process. However, recent studies have shown that
local thermodynamic phase equilibrium and mixing between the involved species
allow the coexistence of both phases in this pressure range. In this work, a
Volume-of-Fluid method adapted to variable-density real fluids is used to solve
the low-Mach-number governing equations coupled with a thermodynamic model
based on the Soave-Redlich-Kwong equation of state. The mixing process,
interface thermodynamics and early deformation of a cool liquid jet composed of
n-decane surrounded by a hotter gas composed of oxygen at 150 bar are analyzed.
Although heat conducts from the hotter gas into the liquid, net condensation
can provide the proper local energy balance at high pressures. Then,
vaporization and condensation may happen simultaneously at different interface
locations. As pressure increases, liquid and gas mixtures become more alike in
the vicinity of the interface. Thus, a combination of low surface tension force
and gas-like liquid viscosities causes an early growth of surface
instabilities. Early results indicate some similarity with high-Weber-number
incompressible flows. The role of vortex dynamics on the interface deformation
is analyzed by using the dynamical vortex identification method.

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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph