Numerical Heat Transfer Part A Applications,
Год журнала:
2023,
Номер
unknown, С. 1 - 20
Опубликована: Авг. 11, 2023
AbstractOne
of
the
most
crucial
topics
in
thermal
sciences
is
analysis
how
an
external
electric
field
affects
natural
convection
flow.
In
this
study,
heat
transfer
electro-hydrodynamic
enclosure
with
a
wavy
hot
wall
numerically
studied.
Al2O3-water
nanofluid
considered
as
working
fluid,
and
furthermore,
effect
radiation
on
characteristics
fluid
flow
simulated.
Non-dimensional
forms
governing
equations
are
solved
using
control
volume
finite
element
method.
The
effects
operational
parameters
such
Rayleigh
number,
nanoparticles
volume-fraction,
Lorentz
force
Eckert
charge
diffusivity
number
maximum
absolute
value
stream
function
average
Nusselt
investigated.
Two
new
defined
to
evaluate
contribution
electrical
results
show
that
Nuave
ascends
7.95%
when
ϕ
increases
from
0
0.05
at
Ra=105.
Also,
values
|Ψmax|
increase
27.6%
37.2%,
respectively,
λ
goes
up
0.5
Rd=1.0.
decrease
48.7%
27.1%,
decreasing
amplitude
parameter
(an)
0.1
0.3
Ra=105.Keywords:
CVFEMelectric
fieldnanofluidnatural
convectionthermal
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
54, С. 103948 - 103948
Опубликована: Янв. 5, 2024
This
work
integrates
incompressible
smoothed
particle
hydrodynamics
(ISPH)
with
machine
learning
(ML)
to
examine
the
uses
of
two
different
domain
shapes,
spline
star-domain,
and
triangle
on
double
diffusion
nano-encapsulated
phase
change
material
(NEPCM).
The
effects
thermal
radiation
exothermic
chemical
reactions
are
conducted
in
this
work.
hexagonal-shaped
is
located
inside
center
star-shape
carrying
(Th&Ch).
left/right
walls
star
shape
kept
at
(Tc&Cc)
other
have
an
adiabatic
condition.
It
recommended
smoothness
closed
curves
heat
mass
transfer
by
changing
curves.
present
investigations
transmission
NEPCM
within
a
complicated
can
be
employed
cooling
systems
electronic/battery,
exchangers,
food
processing,
engineering.
ISPH
simulations
executed
for
pertinent
parameters,
Darcy
number,
Frank-Kamenetskii
Rayleigh
Dufour
Soret
parameter.
performed
showed
significance
compared
smoothening
nanofluid
flow
double-diffusive
convection
annulus.
number
promising
factor
enhancement
controlling
zone
At
spline-star
cavity,
maximum
velocity
rises
32.32
%
54.95
when
grows
from
0
5,
increases
5.
works
effectively
enhancing
distribution
concentration
large
temperature
differences.
Machine
plays
vital
role
many
engineering
applications.
Hence,
ML's
powerful
capabilities
predict
average
Nu‾
Sh‾.
In
proposed
ML
model,
dimensionless
time
parameter
used
as
input
while
their
corresponding
numeral
estimated
values
Sh‾
output
targets
model.
predicted
suggested
model
comparatively
small
error
less
than
1
%.
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
59, С. 104487 - 104487
Опубликована: Май 10, 2024
Enclosure
with
irregular
boundaries
by
providing
surface
corrugations
is
considered
an
efficient
strategy
to
elevate
the
heat
transfer
mechanism
in
laser
technology,
cooling
of
electronic
instrument,
photonic
systems
material
processing,
magnetic
resonance,
and
automobile
industry
are
few
mention.
In
view
such
mesmerizing
utilization
present
work
articulated
considering
L-shaped
corrugated
enclosure
saturated
water
copper
(Cu)
nanoparticles
included.
The
physical
impacts
a
horizontally
oriented
field
permeable
medium
accounted
along
measurement
entropy.
Mathematical
modelling
problem
attained
dimensionless
version
through
set
similar
variables.
Computational
experiments
conducted
application
commercial
software
(COMSOL)
based
on
finite
element
approach.
A
grid
independence
comparison
tests
also
ensure
credibility
simulations.
Impact
parameters
revealed
sketches.
Quantities
interest,
including
local
average
Nusselt
numbers,
Bejan
number,
total
entropy,
evaluated
for
flat
correlated
surfaces.
Induction
base
fluids
tends
reduce
entropy
generation
up
12.45
%.
Growth
NuAvg
(3.08
%
approx.)
increasing
frequency
imposed
triangular
waved
corrugation.
Energies,
Год журнала:
2023,
Номер
16(10), С. 4165 - 4165
Опубликована: Май 18, 2023
Renewable
energy
resources
require
storage
techniques
to
curb
problems
with
intermittency.
One
potential
solution
is
the
use
of
phase
change
materials
(PCMs)
in
latent
heat
thermal
(LHTES)
systems.
Despite
high
density
PCMs,
their
response
rate
restricted
by
low
conductivity.
The
topic
transfer
enhancement
for
increasing
performance
LHTES
systems
has
mainly
focused
on
passive
less
attention
towards
active
methods.
Active
external
power
supplied
system.
In
this
paper,
recent
advances
within
are
reviewed,
including
mechanical
aids,
vibration,
jet
impingement,
injection,
and
fields.
pertinent
findings
related
field
summarized
relation
charging
discharging
processes
PCMs.
Suggestions
future
research
proposed,
importance
additional
input
discussed.
Results in Physics,
Год журнала:
2024,
Номер
58, С. 107365 - 107365
Опубликована: Фев. 9, 2024
Two-dimensional
free
convective
temperature
transportation
and
fluid
flow
within
the
semi-circular
cavity
occupied
by
nanofluid
with
influence
of
inclined
MHD
is
studied
numerically.
While
bottom
wall
warmed
three
distinct
thermal
conditions
(uniform,
parabolic,
sinusoidal),
upper
circular
at
lower
temperatures.
A
slopping
magnetic
field
acts
upon
enclosure
whose
strength
unchanging.
The
governing
non-linear
equations
resolved
numerical
scheme
Galerkin
type
finite
element
technique.
strong
agreement
found
earlier
work.
outcomes
for
model
parameters
likely
Rayleigh
number,
sloping
angle
field,
nanoparticles
volume,
size,
shape,
Brownian
effects,
Hartmann
number
are
demonstrated
through
streamlines,
isothermal
lines,
mean
Nusselt
number.
In
addition,
investigation
conducted
features
various
produced
from
them.
reveal
that
transfer
rate
significantly
enhanced
volume
fraction
buoyancy-driven
parameter
whilst
reduces
higher
Hartman
angles
different
have
a
positive
on
transport.
For
Cu-H2O
nanofluids,
transport
10.98
%
in
uniform
system,
where
it
increases
14.42
parabolic
system
15.53
sinusoidal
only
5
nanoparticles.
Moreover,
nano-sized
particles'
shape
factor
has
noteworthy
role
It
heat
rises
6.79
blade-shaped
Additionally,
as
considering
effects
nanoparticles,
improved
21.45
small-sized
Case Studies in Thermal Engineering,
Год журнала:
2023,
Номер
50, С. 103488 - 103488
Опубликована: Сен. 16, 2023
In
application
of
hexagonal
shapes,
engineers
and
researchers
use
mathematical
modeling,
computational
fluid
dynamics
(CFD),
experimental
techniques
to
study
natural
convection
inside
cavities
improve
the
design
efficiency
engineering
systems.
The
exploration
performance
in
cavity
has
been
an
important
problem
from
earlier
mechanics
field.
present
transient
about
thermal
reaction
behavior
convectional
MWCNT-water
nanofluid
flow
privileged
a
occurrence
magnetic
field
is
scrutinized.
domain
structure
partitioned
with
lower
heated
wall
inner
four
blocks
are
also
heated.
upper
considered
insulated.
Furthermore
other
remaining
walls
cold.
two-dimensional
steady,
incompressible,
governing
equations
which
involve
continuity,
velocity,
temperature
mono
dimensionless
form
expressed
vertically
horizontal
directions
respectively.
Moreover,
transformed
into
their
system
then
elucidated
numerically
help
Galerkin
Finite
Element
Method.
response
surface
methodology
(RSM)
utilized
obtaining
optimal
values
designed
parameters.
This
combined
process
was
successfully
sculpted
optimized
central
composite
methodology.
numerical
fallouts
controlling
parameters
scrutinized
containing
streamlines,
velocities
components
isotherms
elaborated.
investigation
depicts
enhanced
velocity
outcomes
for
different
Rayleigh
number.
average
Nusselt
number
drops
as
boosts
up.
It
concluded
that
reduces
Hartmann
For
larger
nanoparticles
fraction
increases.
analysis
particular
scope
improvement.
additions,
studies
can
be
showed
on
improvement
designs,
thickness,
size
enclosure
cavity.
involved
through
reveals
major
importance
those
geometrical
shapes
playing
role
electronic
cooling.
electronics,
found
heat
sinks
packages.
Natural
plays
crucial
dissipating
devices,
such
microprocessors,
power
LED
lighting
Nanofluids
exhibit
potential
transfer
compared
conventional
coolants.
With
this
aim,
current
enlightens
MWCNTs-water
square-shaped
blocks.
original,
no
previous
accompanied
considering
variation
