Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soft hydraulics: from Newtonian to complex fluid flows through compliant
  conduits   Microfluidic devices manufactured from soft polymeric materials have emerged
as a paradigm for cheap, disposable and easy-to-prototype fluidic platforms for
integrating chemical and biological assays and analyses. The interplay between
the flow forces and the inherently compliant conduits of such microfluidic
devices requires careful consideration. While mechanical compliance was
initially a side-effect of the manufacturing process and materials used,
compliance has now become a paradigm, enabling new approaches to
microrheological measurements, new modalities of micromixing, and improved
sieving of micro- and nano-particles, to name a few applications. This topical
review provides an introduction to the physics of these systems. Specifically,
the goal of this review is to summarize the recent progress towards a
mechanistic understanding of the interaction between non-Newtonian (complex)
fluid flows and their deformable confining boundaries. In this context, key
experimental results and relevant applications are also explored, hand-in-hand
with the fundamental principles for their physics-based modeling. The key
topics covered include shear-dependent viscosity of non-Newtonian fluids,
hydrodynamic pressure gradients during flow, the elastic response (deformation
and bulging) of soft conduits due to flow within, the effect of cross-sectional
conduit geometry on the resulting fluid--structure interaction, and key
dimensionless groups describing the coupled physics. Open problems and future
directions in this nascent field of soft hydraulics, at the intersection of
non-Newtonian fluid mechanics, soft matter physics, and microfluidics, are
noted.

26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph