Journal of Thermal Analysis and Calorimetry,
Год журнала:
2024,
Номер
149(12), С. 6433 - 6457
Опубликована: Май 30, 2024
Abstract
This
numerical
research
study
focuses
on
impacts
of
using
twisted
rib
geometry
the
hydrothermal
performance
and
entropy
generation
characteristics
biologically
synthesized
Ag/water
nanofluid
flowing
in
heat
sink
minichannels.
To
this
end,
twelve
different
geometries
(Case
1
to
12)
were
designed
where
double-row
ribs
at
bottom
top
portions
with
twist
angles
between
−
45°
+
45°.
elucidate
cooling
comprehensively,
four
Reynolds
numbers
(Re
=
500,
1000,
1500,
2000)
nanoparticle
concentrations
(
$$
\varphi
\hspace{0.17em}$$
φ
0%,
0.1%,
0.5%,
1%)
included
computations.
Results
revealed
that
significantly
smoothen
fluid
flow
reduces
pressure
drop
remarkably
depending
angles,
nevertheless,
it
deteriorates
performance.
In
Case
12,
convective
transfer
coefficient
by
up
15.8%
Re
2000
\varphi$$
=1%,
compared
base
case.
However,
pumping
power
requirement
is
decreased
43.9%
Nanoparticle
incorporation
contributes
enhancement
13.5%
lowest
Re.
Frictional
considerably
decreases
(up
31%)
when
are
utilized.
thermal
can
increase
36%,
due
ineffective
ribs.
work
be
regarded
as
a
first
field
concerning
effects
nanofluid-cooled
mini-channel
sinks.
European Mechanical Science,
Год журнала:
2025,
Номер
9(1), С. 16 - 24
Опубликована: Март 20, 2025
This
study
explores
the
thermal
conductivity
characteristics
of
ternary
nanofluids
composed
water-based
Fe3O4-decorated
carboxylated
multi-walled
carbon
nanotubes
(MWCNT-COOH),
reduced
graphene
oxide
(rGO),
and
Fe3O4-CNT-COOH/rGO
nanocomposites.
The
investigation
focuses
on
influence
temperature
nanocomposite
concentration.
Ultrasonic
probes
were
employed
to
ensure
stability
nanofluid,
its
structural
properties
analyzed
using
scanning
electron
microscopy
(SEM),
energy
dispersive
X-ray
spectroscopy
(EDX),
powder
diffraction
(XRD),
Fourier-transform
infrared
(FT-IR).
Thermal
measurements
conducted
a
KD-2
Pro
analyzer
across
range
25-60
°C
mass
fraction
0.025-0.1%.
Results
demonstrated
that
ratio
increased
with
higher
solid
volume
fractions
elevated
temperatures.
Notably,
impact
became
more
significant
at
concentrations.
findings
also
revealed
maximum
enhancement
approximately
50%,
achieved
0.1%
60
°C.
E3S Web of Conferences,
Год журнала:
2024,
Номер
488, С. 02003 - 02003
Опубликована: Янв. 1, 2024
This
study
explores
the
examination
of
thermophysical
characteristics
eco-friendly
CNC-Palm
oil,
GNP-Palm
oil
and
CNC/GNP-palm
mono
hybrid
nanofluids.
The
stability
assessment
involves
a
comprehensive
analysis,
incorporating
visual
observations
thermal
conductivity
assessments.
Notably,
it
was
observed
that
an
elevated
proportion
mixture
contributed
to
enhanced
nanosuspension,
ensuring
uniform
dispersion
nanomaterials
within
base
liquid
for
extended
period.
results
indicate
nanofluids
containing
CNC/GNP
formulated
with
palm
exhibit
substantial
stability.
A
over
impressive
30-day
duration
reveals
minimal
accumulation,
underscoring
enduring
these
also
examines
crucial
physical
properties,
including
viscosity
about
temperature.
most
significant
enhancement
witnessed
in
conductivity,
achieving
noteworthy
100%
increase
0.1w/v%
concentrated
CNC/GNP/Palm
Oil
nanofluid
at
70°C,
demonstrating
improvement
compared
fluid.
Furthermore,
there
are
noticeable
increments
viscosity,
albeit
more
modest
conductivity.
These
outcomes
suggest
direct
relationship
between
increased
concentrations
can
improve
contributes
valuable
insights
into
utilizing
applications,
implications
fields
requiring
performance
fluid
Energies,
Год журнала:
2024,
Номер
17(7), С. 1721 - 1721
Опубликована: Апрель 3, 2024
With
the
growing
demand
for
photovoltaic
(PV)
systems
as
a
source
of
energy
generation
that
produces
no
greenhouse
gas
emissions,
effective
strategies
are
needed
to
address
inherent
inefficiencies
PV
systems.
These
typically
absorb
only
approximately
15%
solar
and
experience
performance
degradation
due
temperature
increases
during
operation.
To
these
issues,
PV–thermal
(PVT)
technology,
which
combines
with
thermal
absorber
dissipate
excess
heat
convert
it
into
additional
energy,
is
being
rapidly
developed.
This
review
presents
an
overview
various
PVT
technologies
designed
prevent
overheating
in
operational
enhance
transfer
from
cells
absorber.
The
methods
explored
include
innovative
designs
focus
on
increasing
contact
surface,
using
mini/microchannels
improved
contiguity,
substituting
traditional
metal
materials
polymers
reduce
construction
costs
while
utilizing
polymer
flexibility.
also
discusses
incorporating
phase
change
latent
absorption
nanofluids
coolant
mediums,
offer
higher
conductivity
than
pure
water.
highlights
significant
observations
challenges
associated
design,
mini/microchannels,
materials,
terms
waste
dissipation.
It
includes
summary
relevant
numerical
experimental
studies
facilitate
comparisons
each
development
approach.
Journal of Thermal Analysis and Calorimetry,
Год журнала:
2024,
Номер
149(12), С. 6433 - 6457
Опубликована: Май 30, 2024
Abstract
This
numerical
research
study
focuses
on
impacts
of
using
twisted
rib
geometry
the
hydrothermal
performance
and
entropy
generation
characteristics
biologically
synthesized
Ag/water
nanofluid
flowing
in
heat
sink
minichannels.
To
this
end,
twelve
different
geometries
(Case
1
to
12)
were
designed
where
double-row
ribs
at
bottom
top
portions
with
twist
angles
between
−
45°
+
45°.
elucidate
cooling
comprehensively,
four
Reynolds
numbers
(Re
=
500,
1000,
1500,
2000)
nanoparticle
concentrations
(
$$
\varphi
\hspace{0.17em}$$
φ
0%,
0.1%,
0.5%,
1%)
included
computations.
Results
revealed
that
significantly
smoothen
fluid
flow
reduces
pressure
drop
remarkably
depending
angles,
nevertheless,
it
deteriorates
performance.
In
Case
12,
convective
transfer
coefficient
by
up
15.8%
Re
2000
\varphi$$
=1%,
compared
base
case.
However,
pumping
power
requirement
is
decreased
43.9%
Nanoparticle
incorporation
contributes
enhancement
13.5%
lowest
Re.
Frictional
considerably
decreases
(up
31%)
when
are
utilized.
thermal
can
increase
36%,
due
ineffective
ribs.
work
be
regarded
as
a
first
field
concerning
effects
nanofluid-cooled
mini-channel
sinks.