Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
60, P. 104805 - 104805
Published: July 14, 2024
The
primary
aim
of
this
study
is
to
extend
a
numerical
approach
aimed
at
improving
the
efficiency
solidification
process.
Two
key
strategies,
namely
scattering
nano-powders
and
installation
fins,
were
employed
intensify
freezing.
By
approximating
neglecting
influence
velocity
terms,
final
equations
streamlined
form
mathematical
model.
To
enhance
accuracy,
mesh
adaptation
was
integrated
with
Galerkin
method
for
solving
Various
scenarios
examined
assess
impression
both
shape
concentration
on
A
significant
correlation
observed
between
additives
conduction,
causing
in
decrement
required
time
by
approximately
32.8
%.
Furthermore,
modifying
selecting
those
higher
factor
substantially
improved
freezing
efficiency,
resulting
an
increase
10.89
Heat Transfer,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 19, 2025
ABSTRACT
Corrugated
pipe
is
used
in
many
engineering
applications
because
of
its
high
performance
compared
with
smooth
pipe.
This
research
involved
numerical
simulations
and
experimental
testing
a
circular
tube
modified
flow
path
to
improve
the
heat
transfer
exchangers.
The
focus
was
on
enhancing
mixing
creating
vortex
flows
within
increase
exchange
efficiency.
impact
seven
design
factors,
including
ring
diameters
(RD)
pitch
between
pitches
(RP),
thermal–hydraulic
investigated.
Water
as
working
fluid
regime
ranges
from
4000
15,000,
indicating
turbulent
flow.
A
constant
flux
25,500
W/m
2
applied,
water
enters
system
at
temperature
298
K
(25°C).
properties
are
assumed
remain
throughout
conditions,
such
steady
state
(the
conditions
do
not
change
time),
incompressible
density
remains
constant),
no‐slip
condition
velocity
surface
any
solid
boundary
zero).
tubes
consistently
outperformed
due
increased
separation.
Both
increasing
Reynolds
number
decreasing
factors
led
formation
patterns.
In
RD
configurations,
Nusselt
saw
an
average
improvement
approximately
45.6%,
while
friction
factor
19%
57%.
RP
configurations
demonstrated
broader
range
enhancements,
reaching
up
35%,
increases
ranging
15%
42%.
Rings
can
significantly
enhance
tubes.
However,
best
configuration
depends
specific
application.
highest
performance,
resulting
1.38
evaluation
factor,
obtained
using
1
mm
20
mm.
simulated
data
showed
excellent
agreement,
maximum
discrepancy
less
than
11%
for
both
dimpled
Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
57, P. 104287 - 104287
Published: March 24, 2024
To
maximize
the
efficiency
of
freezing,
combinations
using
nanoparticles
and
fins
have
been
utilized
in
current
work.
Incorporating
nanofluids
into
solidification
processes
provides
a
refined
efficient
approach
to
transitioning
materials
from
liquid
solid
state.
Triangular
container
involving
has
implemented.
The
shape
fraction
were
varied
this
research.
derived
equations
solved
via
finite
element
method
associated
code
validated
based
on
prior
article.
reduction
freezing
time
was
presumed
as
main
goal
research
resource
utilization
various
industries.
As
greater
amount
nano-powders
is
utilized,
conduction
becomes
stronger
rate
improves
about
27%.
Also,
altering
particles
applying
powders
with
bigger
m
can
lead
by
7%.
Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
55, P. 104165 - 104165
Published: Feb. 22, 2024
The
present
study
investigates
the
enhancement
of
PVT
system
efficiency
through
application
magnetic
force.
Dust
deposition
affects
glass
layer
PV,
altering
magnitude
heat
sources.
addition
a
thermoelectric
layer,
attached
to
silicon
using
EVA,
allows
for
increased
electrical
output.
A
rhombus-shaped
duct
is
filled
with
homogeneous
mixture
H2O
and
Fe3O4
nanomaterial
serving
as
ferrofluid.
dust
over
results
in
decline
useful
by
approximately
10.11%,
leading
25.36%
productivity.
imposition
MHD
increases
thermal
performance
8.9%,
can
be
enhanced
1.8%.
dispersion
nanoparticles
contributes
cooler
this
positive
impact
being
three
times
greater
absence
MHD.
Additionally,
an
increase
inlet
velocity
8.22%
improvement
performance.
Heat Transfer,
Journal Year:
2024,
Volume and Issue:
54(1), P. 420 - 459
Published: Sept. 13, 2024
Abstract
Enhanced
pipe
surfaces
offer
greater
heat
transfer
enhancement
due
to
increased
turbulence
levels,
leading
improved
exchange
performance.
This
study
combines
numerical
simulations
and
experimental
work
identify
the
best
geometric
design
of
enhanced
tubes
for
thermal–hydraulic
performance,
flow
structure,
pressure
drop,
are
validated
with
data.
Water
is
a
working
fluid
Reynolds
numbers
ranging
from
4000
15,000,
q
=
25,500
W/m
2
,
an
inlet
temperature
298
K
constant
property,
steady
state,
no‐slip
condition.
The
three‐dimensional
incompressible
turbulent
in
concavity
dimpled
shape‐enhanced
numerically
studied.
research
found
that
pipes
concave
shape
most
effectively.
overall
significantly
influenced
by
dimples,
their
arrangement
rings,
size
these
number
rings.
However,
cylindrical
dimples
does
not
seem
impact
much.
increase
performance
was
9.8%–61%
dimple
rings
2ring
performed
compared
smooth
8.21%–38.49%
at
effect
ring
as
grouping,
also
diameters
5%–38%
7%–39%
numbers.
evaluation
factor
(PEF)
assesses
considering
both
drop
penalty
transfer.
optimal
configuration
achieving
highest
(PEF
1.295)
rate
(
Re
)
involves
single
2‐mm
diameter,
spaced
10‐mm
apart,
containing
four
dimples.
Furthermore,
discussing
different
parameters
thermal
hydraulic
performances
obtain
increasing
gives
better
guide
engineering
thermohydraulic
exchangers.
Journal of Thermal Analysis and Calorimetry,
Journal Year:
2024,
Volume and Issue:
149(11), P. 5595 - 5609
Published: May 27, 2024
Abstract
In
pursuit
of
advancing
the
efficiency
cold
energy
storage,
a
uniquely
designed
curved
container
has
been
employed,
filled
with
water-nanoparticle
mixtureQ.
The
is
equipped
fins,
strategically
leveraging
enhanced
conduction
facilitated
by
presence
nanoparticles.
simulation
intricate
unsteady
phenomena
in
this
study
conducted
using
finite
element
technique,
providing
robust
analytical
framework.
incorporation
an
adaptive
grid
ensures
refined
resolution,
particularly
vicinity
ice
front
region.
nanoparticle
fraction
(
ϕ
)
emerges
as
pivotal
factor
directly
influencing
rate
solidifying.
dispersion
nano-powders
leads
to
noteworthy
reduction
completion
time,
demonstrating
substantial
33.21%
improvement.
diameter
(dp)
introduces
diverse
effects
on
solidification
process,
primarily
due
its
significant
influence
conductivity
nanomaterial.
An
in-depth
exploration
impact
dp
reveals
compelling
insights.
As
increases
from
smallest
size
40
nm,
there
commendable
15.12%
required
freezing
time.
However,
subsequent
increment
beyond
threshold
results
notable
36.56%
increase
findings
presented
here
not
only
contribute
fundamental
understanding
processes
but
also
hold
practical
implications
for
design
and
optimization
storage
systems.
