Nanotechnology Reviews,
Journal Year:
2024,
Volume and Issue:
13(1)
Published: Jan. 1, 2024
Abstract
The
significance
of
fluid
flow
under
hydrothermal
conditions
within
a
hexagonal
enclosure
spans
across
numerous
fields,
underlining
its
broad
applicability.
However,
our
understanding
the
free
convection
in
these
geometries
is
still
limited
despite
potential
importance
science
and
technology.
Therefore,
this
study
numerically
examines
heat
entropy
generation
porous
cavity
containing
heated
obstacle
while
subjected
to
static
magnetic
field
intensity
B
0
.
Micropolar
hybrid
nanofluid,
composed
TiO
2
graphene
oxide
nanoparticles,
was
used
fill
with
water
as
base
fluid.
finite
difference
method
associated
successive
over-relaxation,
relaxation,
Gauss–Seidel
techniques,
which
are
solve
dimensionless
governing
partial
differential
equations.
desired
outcomes
computed
using
in-house
developed
MATLAB
codes.
A
specific
result
from
prior
research
findings
validate
accuracy
demonstrate
that
an
upsurge
Ra
10
4
6
ϕhnf
{\phi
}_{{\rm{hnf}}}
4%
leads
enhancement
Nu
ABW
53.05
3.14%,
respectively.
diminishes
by
approximately
0.797
4.135%
Ha
increases
20
K
7.5,
average
Bejan
number
(Be
avg
)
consistently
decreases
increases,
but
Be
improves
Ha,
vortex
viscosity
parameter
(
),
increase.
most
important
finding
work
position
significantly
influences
both
processes.
Fluid dynamics & materials processing,
Journal Year:
2024,
Volume and Issue:
20(9), P. 2091 - 2108
Published: Jan. 1, 2024
The
behavior
of
non-Newtonian
power-law
nanofluids
under
free
convection
heat
transfer
conditions
in
a
cooled
square
enclosure
equipped
with
heated
fin
is
investigated
numerically.In
particular,
the
impact
nanofluids,
composed
water
and
Al₂O₃,
TiO₂,
Cu
nanoparticles,
on
enhancement
examined.The
aim
this
research
also
to
analyze
influence
different
parameters,
including
Rayleigh
number
(Ra
¼
10
4
-10
6
),
nanoparticle
volume
fraction
(φ
0%
-20%),
indexes
(n
0.6
-1.4),
dimensions
(Ar
0.3,
0.5,
0.7).Streamlines
isotherms
are
used
depict
flow
related
characteristics.Results
indicate
that
thermal
performance
improves
increasing
number,
regardless
type
or
nanofluid
rheological
behavior.This
suggests
buoyancy
force
has
significant
transfer,
particularly
near
source.The
Nusselt
more
sensitive
variations
fractions
compared
Al₂O₃
TiO₂.Moreover,
average
numbers
for
n
<
1
>
1)
greater
(smaller)
than
Newtonian
fluids
due
decrease
(increase)
viscosity
(decreasing)
shear
rate,
at
same
values
Ra
owing
amplification
(attenuation)
convective
transfer.Notably,
most
substantial
observed
Cu-water
shear-thinning
nanofluid,
where
increases
by
136%
when
changing
from
thinning
154.9%
adding
16%
fraction.Moreover,
an
even
larger
increase
57%
obtained
length
0.3
0.7.
