Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1355 - 1363
Published: May 9, 2025
Improved
heat
transfer
is
crucial
for
better
exchanger
performance
in
many
industries,
from
power
plants
to
spacecraft.
These
methods
facilitate
improved
energy
utilisation,
reduced
operational
expenses,
and
more
compact
system
configurations,
underscoring
their
critical
role
ongoing
research
development
efforts.
Typically
classified
into
passive,
active,
compound
categories,
these
techniques
cater
different
needs:
passive
methods,
devoid
of
external
requirements,
are
favoured
simplicity,
reliability,
cost-effectiveness.
In
contrast,
active
harness
inputs
augment
performance,
while
integrate
advantages
both
approaches
achieve
synergistic
outcomes.
This
review
critically
examines
enhancement
techniques,
highlighting
recent
advancements
practical
implementations
across
thermal
systems.
Key
emphasis
placed
on
strategies
like
twisted
tape
inserts,
perforated
surfaces,
vortex
generators,
which
disrupt
boundary
layers,
induce
turbulence,
enhance
swirl
flows
elevate
convective
coefficients
optimise
without
compromising
efficiency.
Major
Findings:
The
study
highlights
that
inserts
play
a
significant
enhancing
by
generating
flows,
increasing
reducing
the
layer
thickness.
Various
geometrical
modifications,
such
as
rectangular-winged,
alternate-axis,
dual
tapes,
have
demonstrated
remarkable
improvements
with
rates
reaching
up
219%,
albeit
an
associated
increase
pressure
drop.
Overall,
confirms
particularly
optimised
designs,
offer
energy-efficient
cost-effective
solution
improving
exchangers
industrial
applications.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 799 - 806
Published: March 27, 2025
This
study
experimentally
investigates
the
influence
of
micro-channel
height
and
width
on
heat
transfer
pressure
drop
within
sinks,
aiming
to
optimize
their
geometry
for
enhanced
thermal
performance
minimized
loss.
Varying
flow
rates
fluxes
were
applied
different
channel
configurations
determine
coefficient
Nusselt
number.
Results
show
that
narrower
(0.3
mm
vs.
0.4
mm)
taller
(2.0
1.5
channels
improved
due
increased
surface
area,
but
also
drop.
Higher
Reynolds
numbers
(400-1200)
flux
(2.0-6.5
kW/m²)
transfer,
especially
in
channels,
while
roughness
further
at
expense
higher
resistance.
Optimized
geometries
effectively
reduced
sink
temperature.
research
provides
valuable
insights
designing
efficient
exchangers
high-power
electronics
by
balancing
hydraulic
performance.
Major
Findings:
Micro-channel
sinks
demonstrate
a
significant
enhancement
when
surfaces
exhibit
roughness.
However,
this
comes
cost
system.
To
utilize
cooling
systems,
careful
optimization
is
essential
strike
balance
between
maximizing
minimizing
associated
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 839 - 847
Published: March 27, 2025
Recent
studies
have
highlighted
the
significant
potential
of
biodiesel
as
a
sustainable
and
environmentally
friendly
alternative
to
conventional
diesel,
which
has
been
in
widespread
use
for
decades.
This
research
focused
on
detailed
experimental
analysis
performance
characteristics
diesel
engine
using
blends
derived
from
sunflower,
palm,
corn
oils.
The
was
tested
under
varying
load
conditions
at
constant
speed,
with
key
parameters
such
torque,
brake
power,
Brake
Specific
Fuel
Consumption
(BSFC),
thermal
efficiency,
total
fuel
consumption,
exhaust
temperature
meticulously
recorded
analysed.
results
showed
that
all
outperformed
pure
terms
BSFC,
temperature,
offering
clear
economic
benefits
over
traditional
diesel.
Moreover,
reduction
nitrogen
oxide
(NOx)
emissions
observed
blends,
underlining
their
environmental
advantages.
These
findings
add
growing
evidence
supporting
viable
energy
sustainability
protection
solution.
study’s
outcomes
shape
future
policies
aimed
reducing
carbon
encouraging
cleaner
combustion
technologies
diesel-dependent
sectors,
marking
an
essential
step
toward
aligned
global
objectives.
Major
Findings:
Biodiesel
oils
demonstrated
superior
compared
enhanced
lower
reduced
temperatures.
Significant
reductions
NOx
highlight
biodiesel's
aligning
goals.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 377 - 384
Published: Feb. 24, 2025
In
the
present
study
experimental
analysis
of
helical,
spiral
and
conical
coil
with
cone
angle
90O
for
single-phase
fluid
flow
is
reported.
Three
different
configurations
are
analysed
under
steady-state
conditions.
These
three
coils
(helical,
coils)
formed
same
average
diameter,
tube
diameter
length.
For
analysis,
an
setup
suitable
instrumentation
developed.
each
coil,
sufficient
numbers
test
runs
conducted
readings
recorded
constant
inlet
temperature
cold
hot
fluids
as
well
rate
in
every
run,
to
ensure
steady
state.
From
results
experimentation,
heat
transfer
coefficients
calculated
calculations
extended
calculate
Nusselt
number
(Nu)
effectiveness.
The
comparison
presented
from
analysis.
Furthermore,
predict
outlet
fluid,
which
shows
good
agreement
values.
Major
Findings:
helical
exhibited
highest
(Nu),
while
had
lowest
Nu.
demonstrated
intermediate
Nu
effectiveness
(ε)
coiled
exchanger
inversely
proportional
parameter
Z.
Consequently,
system
can
be
readily
predicted
using
graphical
patterns.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 981 - 989
Published: April 16, 2025
This
research
delves
into
the
operational
performance
and
environmental
impact
of
a
single-cylinder
diesel
engine
fueled
with
15
%
blend
Nahar
biodiesel
(B15),
derived
from
non-edible
oil
sources.
The
study
scrutinizes
critical
parameters
such
as
brake
thermal
efficiency,
specific
fuel
consumption,
exhaust
gas
temperature,
emissions
harmful
pollutants
like
carbon
monoxide,
hydrocarbons,
nitrogen
oxides,
particulate
matter
(smoke
opacity).
Experimental
results
indicate
that
while
B15
exhibited
minor
reduction
in
efficiency
at
higher
loads
compared
to
conventional
diesel,
it
demonstrated
substantial
improvements
emission
reduction.
significantly
lowered
CO,
HC,
NOx,
smoke,
contributing
cleaner
healthier
environment.
Additionally,
combustion
process
was
optimized,
evidenced
by
shortened
ignition
delay,
leading
more
efficient
combustion.
In
conclusion,
establishes
viability
sustainability
promising
alternative
fuel.
Its
ability
reduce
without
compromising
significant
degree
underscores
its
potential
contribute
greener
energy
solutions
mitigate
impact.
findings
suggest
can
play
crucial
role
advancing
sustainable
initiatives
ensuring
acceptable
levels.
Major
Findings:
Biodiesel
blends
demonstrate
Brake
Thermal
Efficiency
(BTE)
low
mid
loads,
but
their
declines
high
due
increased
consumption.
Specific
Fuel
Consumption
(BSFC)
(B15)
remains
consistently
than
driven
lower
calorific
value
viscosity.
Despite
these
drawbacks,
offers
advantages,
including
temperatures
(6-9
°C
cooler)
reduced
attributed
superior
oxygen
content.
exhibits
quicker
shorter
delays
enhancing
atomization
quality,
which
positions
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 915 - 922
Published: April 16, 2025
Matrix
headlights,
employing
arrays
of
individually
controlled
Light
Emitting
Diode
(LEDs)
or
laser
diodes,
revolutionise
automotive
lighting
by
dynamically
adapting
to
real-time
driving
conditions.
This
technology
enables
high-beam
usage
without
blinding
other
drivers
while
enhancing
driver
awareness
through
the
projection
road-based
patterns
and
signals.
By
combining
advanced
optics,
electronics,
intelligent
software,
matrix
headlights
offer
unprecedented
control
adaptability,
significantly
improving
road
safety
experiences.
Research
studies
have
demonstrated
potential
provide
adaptive,
energy-efficient,
safety-enhancing
solutions
compared
traditional
systems.
However,
challenges
such
as
calibration
complexity,
scalability
issues
limitations
in
handling
extreme
environmental
conditions
need
be
addressed
for
widespread
adoption.
Major
Findings:
utilise
LEDs
diodes
adjust
light
beam,
preventing
glare
oncoming
maintaining
visibility.
These
systems
enhance
projecting
signals,
challenging
While
offering
significant
advancements
efficiency,
complexity
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1065 - 1076
Published: April 16, 2025
This
study
explores
the
improvement
in
performance
of
flat-plate
solar
collectors
by
integrating
hybrid
Photo-Voltaic
(PV)-thermal
systems.
Numerical
simulations
were
performed
using
ANSYS
software,
incorporating
Computational
Fluid
Dynamics
(CFD)
and
steady-state
thermal
modeling.
The
research
focused
on
a
circular-section
PV/T
collector
exposed
to
irradiation
1000
W/m²,
with
ambient
inlet
water
temperatures
set
at
288
K.
Three
different
flow
rates
(0.02,
0.025,
0.03
kg/s)
examined
determine
their
effects
efficiency
outlet
temperature.
Two
configurations
analyzed:
one
without
glass
cover
(steady-state
analysis)
another
cooling
(CFD).
findings
revealed
that
increasing
rate
from
0.02
kg/s
significantly
lowered
panel's
heating
rate,
enhancing
but
reducing
output.
Future
aims
develop
PV
cells
improved
photon
absorption
maximize
both
electrical
energy
production.
Furthermore,
adding
extra
layers
within
panel
could
optimize
heat
transfer
boost
overall
performance.
These
systems'
capability
generate
electricity
under
diverse
atmospheric
conditions,
such
as
dust,
clouds,
snow,
sets
them
apart
conventional
highlights
potential
for
sustainable
solutions.
Major
Findings:
Increasing
reduced
heating,
improving
system
(up
95
%)
decreasing
Optimal
was
achieved
kg/s,
maintaining
lowest
temperature
(312.50
K)
ensuring
efficient
dissipation.
Hybrid
PV-thermal
systems
demonstrated
superior
generation
highlighting
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1053 - 1063
Published: April 17, 2025
This
study
experimentally
examined
the
impact
of
delta
wing
Vortex
Generators
(VGs)
on
heat
transfer
within
a
trapezoidal
duct
using
airflow.
VGs
were
installed
at
varying
angles
attack
(β).
Results
revealed
significant
enhancement
in
coefficients
compared
to
smooth
duct.
The
Nusselt
Number
(NU)
consistently
increased
with
Reynolds
number
(Re)
for
all
configurations.
However,
key
finding
was
that
significantly
Nu,
even
identical
mass
flow
rates,
demonstrating
crucial
role
vortex-induced
turbulence
augmenting
transfer.
ratio
Nu
without
(Nu/Nuo)
increasing
Re.
Notably,
highest
Nu/Nuo
values
observed
β
=
300.
Comparing
experimental
data
theoretical
predictions
showed
considerably
higher
Nu/NuD
Furthermore,
Stanton
(St)
and
Thermal
Performance
Enhancement
Factor
(TEF)
exhibited
substantial
improvements
VGs,
recorded
These
findings
strongly
suggest
strategically
placed
can
effectively
enhance
ducts,
providing
valuable
insights
optimizing
thermal
performance
various
engineering
applications.
Major
Findings:
demonstrated
incorporating
enhanced
(Nu)
(Re),
presence
further
augmented
constant
highlighting
turbulence.
VG
angle
(β)
300
degrees.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1343 - 1354
Published: May 9, 2025
Mixing
operations
play
a
vital
role
in
various
industrial
processes,
with
the
structural
integrity
of
mixer
shafts
being
crucial
for
optimal
performance
and
reliability.
This
study
investigates
design,
modeling,
Finite
Element
Analysis
(FEA)
paddle
shaft,
comparing
two
configurations—one
stiffeners
one
without.
The
shaft
assembly,
including
components
such
as
pipe,
end
shafts,
stiffeners,
paddles,
was
modeled
using
Pro-E
software,
while
ANSYS
13.0
used
FEA
to
assess
stress
distribution,
deformation,
under
applied
loading
conditions.
A
static
analysis
conducted,
considering
self-weight,
gravity,
pressure
0.77
MPa,
uniform
boundary
conditions
both
configurations.
results
indicate
that
stiffened
exhibited
lower
maximum
(105.26
MPa)
deformation
(1.5
mm)
compared
without
(173.05
MPa
2.1
mm
deformation).
Theoretical
calculations
confirmed
values
remained
within
permissible
limits
Stainless
Steel
(SS),
making
preferred
design.
Additionally,
explores
potential
weight
reduction
by
replacing
SS
carbon/
epoxy
composite
materials,
demonstrating
significant
savings
maintaining
integrity.
Manufacturing
material
specifications,
experimental
validation
through
hydrostatic
load
trials
reliability
selected
showed
an
8%
deviation
between
simulated
reinforcing
accuracy
approach.
research
underscores
importance
reinforcement
provides
valuable
insights
into
design
optimization,
selection,
validation.
Future
studies
could
explore
further
advanced
composites,
ensuring
durability
cost-effectiveness.
Major
Findings:
revealed
superior
performance,
unstiffened
deformation),
highlighting
effectiveness
enhancing
Experimental
test
at
7.7×10⁻²
predictions
results,
confirming
simulation
explored
stainless
steel
carbon/epoxy
mechanical
strength
durability,
offering
future
lightweight
optimizations.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1313 - 1320
Published: May 9, 2025
This
study
investigates
the
effectiveness
of
Phase
Change
Material
(PCM)-based
thermal
management
in
portable
electronic
devices,
particularly
focusing
on
n-eicosane
as
a
heat
storage
medium.
The
research
examines
ability
Heat
Storage
Unit
(HSU)
containing
PCM
to
regulate
chip
temperatures
mobile
devices
such
Personal
Digital
Assistants
(PDAs)
and
wearable
computers.
Experimental
tests
assess
impact
dissipation
rates
orientation
HSU
temperature
distribution.
Findings
reveal
that
effectively
absorbs
excess
during
transient
operation,
maintaining
below
critical
threshold
50°
C
for
extended
periods.
However,
high
power
can
still
lead
overheating,
highlighting
importance
optimized
source
placement
volume.
results
underscore
potential
PCM-based
passive
cooling
solutions
enhancing
performance
compact
systems.
Major
Findings:
confirms
regulates
keeping
them
50°C
operation.
sources
volume
play
crucial
roles
distribution,
improper
configurations
localized
overheating.
While
enhances
stability,
cause
spikes,
necessitating
additional
design
optimizations
improved
performance.
Journal of Mines Metals and Fuels,
Journal Year:
2025,
Volume and Issue:
unknown, P. 1247 - 1256
Published: May 9, 2025
This
study
focuses
on
the
failure
analysis
and
structural
evaluation
of
shaft
in
a
double-shaft
paddle
mixer,
vital
component
industrial
mixing
processes
used
food
processing,
fertilizer
production,
pharmaceutical
manufacturing.
The
mixer
is
designed
to
blend
materials
different
densities,
sizes,
viscosities
efficiently
through
centrally
mounted
horizontal
that
rotates
inside
cylindrical
chamber.
system
includes
paddles
for
agitation,
feed
openings
material
input,
discharge
valve
controlled
output.
A
primary
concern
this
research
mechanical
driving
shaft,
which
transmits
power
from
motor
via
gear
drive.
Structural
weaknesses
mechanisms
were
investigated
by
analysing
pressure,
bending
moments,
externally
applied
forces.
Stress
distributions
computed
identify
critical
locations
could
compromise
shaft’s
integrity.
three-dimensional
(3D)
model
was
developed
using
Pro-E
software
enhance
accuracy.
Finite
Element
Analysis
(FEA)
performed
ANSYS
13.0
determine
stress
distribution,
deformation,
failure-prone
regions
under
operational
loads.
numerical
results
cross-verified
with
theoretical
calculations
based
ASME
design
codes
validate
adequacy.
prototype
fabricated
tested
actual
operating
conditions
confirm
computational
findings
further.
Experimental
closely
matched
FEA
predictions,
proving
effectiveness
proposed
modifications.
optimised
exhibited
increased
durability,
improved
integrity,
enhanced
performance.
underscores
importance
virtual
simulations
before
manufacturing,
demonstrating
how
predictive
minimises
risks.
contributes
cost-efficient,
time-saving
improvements,
reducing
waste
while
ensuring
reliability
systems.
These
have
broad
implications
improving
durability
efficiency
Major
Findings:
identifies
excessive
torsional
stress,
fatigue,
improper
loading
as
causes
failure.
conducted,
validated
experimental
testing,
confirming
enhances
efficiency,
risks
