Thermally fully developed pipe flows of active liquids
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(3)
Published: March 1, 2025
Active
matter
laden
active
liquids
define
a
unique
class
of
liquids,
whose
extremely
rich
dynamics
can
be
captured
only
by
appropriately
considering
the
contribution
induced
stresses.
In
this
paper,
we
develop
analytical
solutions
for
studying
effect
background
fluid
flow
in
temperature
distribution
and
Nusselt
number
thermally
fully
developed
pipe
with
constant
surface
heat
flux.
Specifically,
consider
an
liquid
consisting
particles
demonstrating
vortex
defects:
consequently,
presence
axial
gradient
activity,
there
occurs
pressure-driven
that
has
profile
different
from
Hagen-Poiseuille
non-active
flow.
We
find
case
is
3.83,
which
smaller
than
classical
value
4.36
observed
(with
flux).
justify
decrease
noting
where
activity
(for
flows)
identical
to
pressure
flows),
overall
strength
flows:
such
reduced
causes
convective
transfer
triggering
flows.
This
also
away
wall
greater
mean
temperature)
Language: Английский
Solute dispersion in pre-turbulent confined active nematics
Soft Matter,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
We
study
how
self-organised
active
flows
in
confined
channels
disperse
solutes
and
extend
the
Taylor–Aris
dispersion
law
to
incorporate
nematic
flows.
Language: Английский
Nanocapillary Core-Annular Flows of Immiscible Active and Non-Active Liquids Trigger External-Drive-Free Nanofluidic Liquid Transport
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 16, 2025
In
this
paper,
we
develop
analytical
solutions
for
investigating
the
nanocapillary
core-annular
transport
of
an
active
liquid
and
immiscible
non-active
liquid.
The
contains
particles
that
show
vortex
defects,
which
trigger
a
circular
polarization
field,
eventually
enabling
generation
induced
pressure-driven
flow
inside
fluids
in
presence
axial
gradient
activity
(or
concentration
particles).
Here
consider
two
separate
scenarios.
For
first
(second)
case,
occupies
core
(annular)
region
while
annular
(core)
region.
Our
main
finding
is
both
these
cases,
drives
can
achieve
significant
volume
rate
(of
flow)
appropriate
strength
particles);
therefore,
such
nanofluidic
driven
fluid
occurs
with
no
external
driving
(such
as
pressure
or
applied
electric
field).
Also,
greater
thickness
layer
increases
across
entire
but
causes
nonmonotonic
variation
Furthermore,
case
where
core,
larger
active:non-active
viscosity
ratio
significantly
enhances
overall
transport;
however,
other
has
effect.
Finally,
provide
our
results
there
finite
slip
at
walls.
We
find
depending
on
scenario
(active
occupying
region),
different
signs
lengths
have
influences
magnitude
direction
velocity
field
system
Language: Английский
Slip length and rapid fluid flow in hybrid nanochannels
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(12)
Published: Dec. 1, 2024
Recent
advances
in
nanofabrication
have
highlighted
the
need
for
advanced
theoretical
models
to
accurately
estimate
fluid
flow
enhancement
and
slip
length
(δ)
hybrid
nanochannels,
where
one
wall
consists
of
graphene
other
is
composed
a
different
material.
In
this
study,
we
extend
formalism
factor
rapid
nanochannels
by
incorporating
two
key
elements:
Taylor–Aris
dispersion
(TD)
effect
characteristics
nanochannels.
Our
method
based
on
TD
framework
proposed
precisely
determine
unknown
Additionally,
introduce
generalized
through
with
height
H.
This
expression
incorporates
Peclet
number
(Pe)
lengths,
given
ε=g+β(1+ksPe2),
reduces
traditional
form
ε=1+6δ/H
nonhybrid
channels.
The
not
only
bridges
gap
between
classical
theory
modern
nanofluidic
systems
but
also
offers
quantitative
insights
into
interplay
length,
channel
dimensions,
enhancement.
Furthermore,
work
provides
robust
foundation
practical
implications
applications
such
as
microfluidics,
water
filtration,
material
design.
Language: Английский