Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Side branched patterns, coalescence and stable interfaces during radial
  displacement of a viscoelastic fluid   We explore the interfacial instability that results when a Newtonian fluid (a
glycerol-water mixture, inner fluid) displaces a viscoelastic fluid (a dense
cornstarch suspension, outer fluid) in a radial Hele-Shaw cell. As the ratio of
viscosities of the inner and outer fluids is increased, side branched
interfacial patterns are replaced by more stable interfaces that display
proportionate growth and finger coalescence. We correlate the average finger
spacing with the most dominant wavelength of interfacial instability, computed
using a mathematical model that accounts for viscous fingering in miscible
Hele-Shaw displacements. The model predictions on the role of viscosity ratio
on finger spacing are in close agreement with the experimental observations.
Our study lends insight into the significant contribution of the
viscoelasticity of the outer fluid on the morphology and growth of interfacial
patterns.

15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
18
The categories of this paper are: econ
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th