Energies,
Journal Year:
2025,
Volume and Issue:
18(10), P. 2501 - 2501
Published: May 13, 2025
The
enhancement
of
the
thermal
and
thermo-hydraulic
performance
a
semi-circular
solar
air
collector
(SCSAC)
is
numerically
investigated
using
porous
obstacles
made
metal
foam
with
without
longitudinal
Y-shaped
fins.
Two
10
40
PPI
material
samples
are
examined.
Three-dimensional
models
built
to
simulate
SCSAC:
model
(I)
clear
passage;
(II)
only
obstacles,
(III)
as
well
Y-fins.
COMSOL
Multiphysics
software
version
6.2
based
on
finite
element
methodology
employed.
A
conjugate
heat
transfer
(k-ε)
turbulence
selected
both
fluid
flow
across
entire
computational
domain.
However,
local
non-equilibrium
(LTNE)
applied
in
regions.
findings
demonstrated
that
adding
novel
proposed
configuration
particularity
may
enhance
efficiency
by
about
30%,
outlet
temperature
rise
7%
compared
other
models.
Also,
evaluation
factor
this
greater
than
one
all
cases.
Additionally,
accomplished
occupying
5%
passage
volume,
thereby
including
an
associated
pressure
drop
minimal
magnitude.
Processes,
Journal Year:
2025,
Volume and Issue:
13(3), P. 829 - 829
Published: March 12, 2025
The
toothless
oil
stirring
disk
is
vital
in
modern
transmission
technology,
particularly
fields
like
aviation,
aerospace,
and
nuclear
power,
significantly
impacting
equipment
performance.
Oil-stirring
lubrication
widely
used
internal
systems
due
to
its
simplicity
high
reliability,
but
oil-stirring
losses
during
contribute
increased
system
temperatures,
affecting
lifespan
Accurate
simulation
of
the
two-phase
flow
process
high-speed
disks
crucial
for
extending
service
life.
This
paper
proposes
a
dynamic
modeling
approach
disks,
integrating
volume
fluid
(VOF)
model
RNG
k-ε
turbulence
model,
alongside
spring
smoothing
mesh
reconstruction
techniques.
explores
distribution
high-speed,
pans,
investigating
effects
different
pan
speeds
heights
on
Results
indicate
that
speed
height
are
key
improving
efficiency.
At
speeds,
centrifugal
force
gravity
cause
lubricating
detach
from
surface,
continuing
splash
inertia.
3200
r/min
an
level
20
mm,
stable
film
forms
gearbox.
Higher
generate
greater
turbulence,
enhancing
effectiveness.
findings
offer
theoretical
insights
support
gearbox
design
optimization
aerospace
similar
fields.
Energies,
Journal Year:
2025,
Volume and Issue:
18(7), P. 1738 - 1738
Published: March 31, 2025
This
study
investigates
the
dynamic
behavior
of
a
jacket-supported
offshore
wind
turbine
(JOWT)
by
developing
its
substructure
and
controller
tailored
for
IEA
15
MW
reference
turbine.
A
fully
coupled
numerical
model
integrating
turbine,
jacket,
pile
is
established
to
analyze
natural
frequencies
responses
system
under
wind–wave–current
loading
seismic
excitations.
Validation
studies
confirm
that
proposed
JOWT
configuration
complies
with
international
standards
regarding
frequency
constraints,
bearing
capacity
requirements,
serviceability
limit
state
criteria.
Notably,
fixed-base
assumption
leads
overestimations
32.4%
13.9%
in
fore-aft
third-
fourth-order
modes,
respectively,
highlighting
necessity
soil–structure
interaction
(SSI)
modeling.
During
both
operational
extreme
wind–wave
conditions,
structural
are
governed
first-mode
vibrations,
pile-head
axial
forces
constituting
primary
resistance
against
jacket
overturning
moments.
In
contrast,
excitations
conversely
trigger
significantly
higher-mode
activation
support
structure,
where
SSI
effects
substantially
influence
response
magnitudes.
Comparative
analysis
demonstrates
neglecting
underestimates
peak
BCR
(Bonds
Corner
Record
1979
Imperial
Valley
Earthquake)
ground
motion
29%
(nacelle
acceleration),
21%
(yaw-bearing
bending
moment),
42%
shear
force),
17%
(tower-base
moment).
Applied Sciences,
Journal Year:
2025,
Volume and Issue:
15(8), P. 4140 - 4140
Published: April 9, 2025
Triply
Periodic
Minimal
Surface
(TPMS)
heat
exchangers
have
attracted
significant
attention
for
their
high
surface
area
and
effective
thermal
performance.
This
study
evaluates
the
performance
of
TPMS
under
turbulent
flow
conditions
using
aluminum
(Al)
silver
(Ag)
materials
with
pure
water
nanofluid
as
working
fluids.
The
implementation
Ag
structures
resulted
in
approximately
15%
enhancement
compared
to
Al
due
superior
conductivity.
introduction
(0.6%
volume
concentration)
improved
overall
transfer
efficiency
by
12%
water.
Performance
evaluation
criteria
(PEC)
analysis
demonstrated
that
achieved
up
30%
higher
values
than
structures.
Temperature
homogeneity
analyses
revealed
improvements,
showing
a
24%
reduction
temperature
variation
when
nanofluid,
while
exhibited
40%
better
uniformity.
Computational
fluid
dynamics
validated
experimental
findings
deviations
less
7%,
confirming
model’s
reliability.
These
results
demonstrate
potential
high-performance
cooling
applications
provide
valuable
insights
future
exchanger
designs.
enhanced
management
system
(TMS)
nanofluids
contributes
reduced
energy
consumption,
supporting
environmentally
conscious
decision-making
industrial
systems.
Energies,
Journal Year:
2025,
Volume and Issue:
18(10), P. 2501 - 2501
Published: May 13, 2025
The
enhancement
of
the
thermal
and
thermo-hydraulic
performance
a
semi-circular
solar
air
collector
(SCSAC)
is
numerically
investigated
using
porous
obstacles
made
metal
foam
with
without
longitudinal
Y-shaped
fins.
Two
10
40
PPI
material
samples
are
examined.
Three-dimensional
models
built
to
simulate
SCSAC:
model
(I)
clear
passage;
(II)
only
obstacles,
(III)
as
well
Y-fins.
COMSOL
Multiphysics
software
version
6.2
based
on
finite
element
methodology
employed.
A
conjugate
heat
transfer
(k-ε)
turbulence
selected
both
fluid
flow
across
entire
computational
domain.
However,
local
non-equilibrium
(LTNE)
applied
in
regions.
findings
demonstrated
that
adding
novel
proposed
configuration
particularity
may
enhance
efficiency
by
about
30%,
outlet
temperature
rise
7%
compared
other
models.
Also,
evaluation
factor
this
greater
than
one
all
cases.
Additionally,
accomplished
occupying
5%
passage
volume,
thereby
including
an
associated
pressure
drop
minimal
magnitude.
