Influence of dielectric characteristics on bubble dynamics and material removal mechanism in electrical discharge machining
Physics of Fluids,
Год журнала:
2025,
Номер
37(1)
Опубликована: Янв. 1, 2025
The
bubble
formation
process
during
electrical
discharge
machining
(EDM)
is
affected
by
the
dielectric
and
magnitude
of
flow
rate.
At
present,
dynamic
characteristics
material
removal
are
insufficiently
characterized
in
existing
studies.
In
this
study,
processes
workpiece
were
simulated
based
on
model
flushing
three-phase
for
EDM
with
different
dielectrics
rates,
pressure,
characteristics,
mechanism
analyzed.
Meanwhile,
rate
experiments
single
pulse
de-ionized
water
carried
out
to
verify
above
liquid.
These
results
showed
that
both
debris
accumulation
effect
can
delay
explosion
impacting
pressure.
degree
expansion
volume
molten
fluid
determine
size
region
together.
weakening
impact
promotes
stable
growth
while
decreasing
contribution
higher
than
bubble,
80%
discharged
through
enhancing
flushing.
There
more
frequent
evolution
behaviors
dynamics
emulsion
a
period
kerosene.
study
these
revealed
detailed
understanding
system
EDM,
providing
foundation
improvement
efficiency
quality.
Язык: Английский
Dynamics of a tail cavity induced by the vertical motion of an underwater vehicle
Physics of Fluids,
Год журнала:
2025,
Номер
37(2)
Опубликована: Фев. 1, 2025
This
study
investigates
the
dynamics
of
tail
cavity
induced
by
an
underwater
vehicle.
The
morphological
evolution
and
pressure
characteristics
are
simulated
using
a
numerical
model
based
on
boundary
integral
method.
is
validated
against
experiments
conducted
us.
mechanisms
certain
behaviors
during
process
explored
from
perspective
pressure,
flow
field
at
different
vertical
radial
positions
obtained.
Then,
influence
initial
vehicle
velocity
parameter
fracture
jet
studied.
In
terms
behavior,
we
find
that
location
length
sub-cavities
undergo
abrupt
changes
as
vary.
secondary
necking
considered
primary
cause
these
changes.
jetting
governing
parameters
impact
collapse
extent
moment
impact.
Finally,
variation
kinetic
energy
attached
sub-cavity
residual
this
quantitatively
studied
within
selected
space.
Язык: Английский
Thermal and mechanical attributes and swelling percentage of hydrogels by changing in magnetic field frequency using computer simulation
International Communications in Heat and Mass Transfer,
Год журнала:
2025,
Номер
165, С. 109070 - 109070
Опубликована: Май 11, 2025
Язык: Английский
Alginate Sphere-Based Soft Actuators
Gels,
Год журнала:
2025,
Номер
11(6), С. 432 - 432
Опубликована: Июнь 5, 2025
Alginate
hydrogels
offer
distinct
advantages
as
ionically
crosslinked,
biocompatible
networks
that
can
be
shaped
into
spherical
beads
with
high
compositional
flexibility.
These
architectures
provide
isotropic
geometry,
modularity
and
the
capacity
for
encapsulation,
making
them
ideal
platforms
scalable,
stimuli-responsive
actuation.
Their
ability
to
respond
thermal,
magnetic,
electrical,
optical
chemical
stimuli
has
enabled
applications
in
targeted
delivery,
artificial
muscles,
microrobotics
environmental
interfaces.
This
review
examines
recent
advances
alginate
sphere-based
actuators,
focusing
on
fabrication
methods
such
droplet
microfluidics,
coaxial
flow
functional
surface
patterning,
strategies
introducing
multi-stimuli
responsiveness
using
smart
polymers,
nanoparticles
biologically
active
components.
Actuation
behaviours
are
understood
correlated
physical
mechanisms
including
swelling
kinetics,
photothermal
effects
field-induced
torque,
supported
by
analytical
multiphysics
models.
demonstrated
functionalities
include
shape
transformation,
locomotion
mechano-optical
feedback.
The
concludes
an
outlook
existing
limitations,
material
stability,
cyclic
durability
integration
complexity,
proposes
future
directions
toward
development
of
autonomous,
multifunctional
soft
systems.
Язык: Английский
Study on the effect of geometric shape on microswimmer upstream motion
Physics of Fluids,
Год журнала:
2024,
Номер
36(10)
Опубликована: Окт. 1, 2024
The
upstream
motility
of
three
microswimmer
shapes
(circular
squirmer,
squirmer
rod,
and
elliptical
squirmer)
at
the
center
a
Poiseuille
flow
is
numerically
investigated
using
lattice
Boltzmann
method.
Based
on
stability
ability,
swimming
velocities
four
motion
states
(stable
motion,
progressively
unstable
failure)
are
summarized.
results
show
that
circular
rod
more
stable
than
squirmer;
however,
has
greatest
advantage
in
velocity
can
swim
up
to
twice
as
fast
under
same
conditions.
type
also
key
influencing
state,
which
reflected
differently
distinct
shapes.
increase
Reynolds
number
(Re)
self-propelled
strength
(α)
aggravates
instability;
for
elongated
microswimmers,
aspect
ratio
(ε)
plays
role
rather
state.
Moreover,
pusher
always
better
puller,
especially
when
Re
increases.
Notably,
all
microswimmers
maintain
preset
maximum
field.
These
findings
provide
guidelines
selection
design
parameters
appearance
resist
complex
incoming
flows.
Язык: Английский
Computational modeling of hydrogen behavior and thermo-pressure dynamics for safety assessment in nuclear power plants
Physics of Fluids,
Год журнала:
2024,
Номер
36(12)
Опубликована: Дек. 1, 2024
Following
the
Three
Mile
Island
Nuclear
Generating
Station
incident
1979,
extensive
research
has
focused
on
preventing
hydrogen
accumulation
and
explosions
during
nuclear
power
plant
emergencies.
We
used
advanced
computational
fluid
dynamics
(CFD)
simulations
to
analyze
distribution,
pressure
dynamics,
efficacy
of
safety
measures
across
various
containment
structures
under
accident
scenarios.
Results
indicate
that
smaller
experience
rapid
accumulation,
reaching
a
peak
2.5
bars
temperature
120
°C
within
first
30
s.
Structural
integrity
is
compromised
at
pressures
around
3.8
bars,
leading
failure
10
min
sustained
high
pressure.
In
contrast,
larger
exhibit
delayed
buildup,
peaking
2.3
with
corresponding
110
°C,
maintain
for
up
min.
Fire
scenarios
demonstrate
reach
temperatures
500
which
resulted
in
partial
structural
failure,
whereas
containments
withstand
450
40
without
compromise.
When
concentrations
exceed
35%,
surpass
1430
explosion
risks
increase
substantially,
reduces
effectiveness
passive
mitigation
systems.
Язык: Английский