Applied Sciences,
Journal Year:
2024,
Volume and Issue:
14(5), P. 1785 - 1785
Published: Feb. 22, 2024
In
micro-abrasive
water
jet
polishing
(MAWJP)
technology,
where
abrasive
particles
serve
as
tools,
tend
to
form
large
clusters,
leading
increased
nozzle
wear
and
diminished
material
quality.
Achieving
a
solution
with
good
dispersion
stability
is
crucial
for
enhancing
accuracy
minimizing
wear.
Therefore,
this
study
employed
three
dispersants
distinct
mechanisms
examine
the
impact
of
each
dispersant’s
concentration
on
across
various
concentrations.
Through
experimentation,
optimal
dispersant
type
ratio
were
determined,
effect
selected
performance
was
validated.
The
results
experiment
indicated
that,
in
comparison
Na(PO3)6
polyethylene
glycol
(PEG),
containing
1.0–2.0
wt%
phosphoric
ester
compounds
exhibited
more
stable
(zeta
potential
<
−50
mV)
superior
dispersibility,
characterized
by
smaller
average
particle
size.
Furthermore,
K9
optical
glass
subjected
fixed-point
local
using
dispersant.
revealed
at
1.0
an
20
wt%,
smooth
symmetrical
removal
profile
could
be
achieved.
experiment,
reduction
rate
root
mean
square
surface
roughness
(RMS)
from
54.33%
82.24%,
peak-to-valley
height
difference
(PV)
38.84%
68.97%.
conclusion,
incorporation
proves
effective
dispersibility
particles,
thereby
improving
quality
materials
MAWJP.
Processes,
Journal Year:
2023,
Volume and Issue:
11(2), P. 568 - 568
Published: Feb. 13, 2023
Multiphase
vortices
are
widely
present
in
the
metallurgical
pouring
processes,
chemical
material
extraction,
hydroelectric
power
plant
energy
conversion,
and
other
engineering
fields.
Its
critical
state
detection
is
of
great
significance
improving
product
yield
resource
utilization.
However,
multiphase
vortex
a
complex
dynamics
problem
with
highly
nonlinear
features,
its
fluid-induced
vibration-generation
mechanism
faces
significant
challenges.
A
fluid-solid
coupling-based
modeling
method
proposed
to
explore
mass
transfer
process
vorticity
distribution
mechanism.
vibration-processing
utilized
discuss
four
flow-state
transition
features.
vibration
experiment
platform
established
verify
numerical
results.
It
found
that
can
better
reveal
vibration-evolution
regularities
coupling
process.
The
flow
field
has
maximum
value
water–oil–gas
coupled
process,
induces
pressure
pulsation
phenomenon,
frequency
amplitude
much
larger
than
water
phase
water–oil
two-phase
states.
In
generation
state,
increasing
step
structure
high-frequency
bands
(45
Hz~50
Hz)
random
pulse
components
be
used
for
online
multiphase-coupling
Micromachines,
Journal Year:
2025,
Volume and Issue:
16(1), P. 66 - 66
Published: Jan. 7, 2025
In
microfluidic
chips,
glass
free-form
microchannels
have
obvious
advantages
in
thermochemical
stability
and
biocompatibility
compared
to
polymer-based
channels,
but
they
face
challenges
processing
morphology
quality.
Hence,
picosecond
laser
etching
with
galvanometer
scanning
is
proposed
machine
spiral
channels
on
a
substrate.
The
objective
disperse
sort
microparticles
from
microchip
that
difficult
cut.
First,
the
micropillar
array
microchannel
were
designed
particles
microchips,
respectively;
then,
path
interval
of
5
μm
was
according
spot
diameter
etching;
next,
effects
power,
speed
accumulation
times
experimentally
investigated
regarding
microchannels;
finally,
flowing
test
10
performed
analyze
dispersing
sorting
performance.
It
shown
reducing
power
alongside
increasing
effectively
reduced
channel
depth
surface
roughness.
roughness
reached
about
500
nm
or
less
when
9
W,
1000
mm/s,
cumulative
number
4.
etched
array,
width
89
an
97
μm,
able
different
into
microchannel.
Moreover,
spiral-structured
channel,
aspect
ratio
0.51,
significantly
influenced
velocity
gradient
distribution,
particle
focusing,
stratification.
At
flow
rates
300-600
μL/min,
produced
stable
focusing
bands.
Through
microchip,
mixed
sorted
by
laminar
at
400-500
μL/min.
These
findings
contribute
design
high-performance
chips
for
dispersion
sorting.
Processes,
Journal Year:
2022,
Volume and Issue:
11(1), P. 42 - 42
Published: Dec. 25, 2022
The
energy-conversion
stability
of
hydropower
is
critical
to
satisfy
the
growing
demand
for
electricity.
In
low-head
plants,
a
gravitational
surface
vortex
easily
generated,
which
causes
irregular
shock
vibrations
that
damage
turbine
performance
and
input-flow
stability.
complex
fluid
dynamic
problem
with
high
nonlinear
features.
Here,
we
thoroughly
investigate
its
essential
hydrodynamic
properties,
such
as
Ekman
layer
transport,
heat/mass
transfer,
pressure
pulsation,
vortex-induced
vibration,
note
some
significant
scientific
issues
well
future
research
directions
opportunities.
Our
findings
show
turbulent
analytical
solution
multi-scale
modeling
technology,
working
condition
across
scale
transfer
mechanism,
high-precision
measurement
technology
high-speed
vortexes,
gas–liquid–solid
three-phase
dynamics
model
are
main
directions.
vibration
transition
mechanism
particle
flow
in
restricted
pipelines,
improvement
signal
processing
algorithms
better
design
anti-spin/vortex
elimination
devices,
continue
draw
attention.
relevant
result
can
offer
helpful
reference
fluid-induced
detection
provide
technical
energy
conversion.
Processes,
Journal Year:
2023,
Volume and Issue:
11(2), P. 561 - 561
Published: Feb. 12, 2023
The
transmission
in
automobiles
is
the
core
component
to
ensure
operational
stability.
Heat
accumulation
meshing
process
will
reduce
efficiency
and
affect
service
life.
Here,
essential
physical
improve
heat
dissipation
dynamic
evolution
thermal
transfer
characteristics
of
lubricating
oil
fields
during
gear
meshing.
This
paper
presents
a
modeling
solving
method
for
lubrication
features
based
on
volume
fluid
model
piecewise
linear
interface
construction
(VOF-PLIC).
mesh
technique
combines
spring
smoothing
reconstruction
optimize
numerical
solution
process.
law
obtained
by
analyzing
under
different
speed/steering
conditions.
results
show
that
proposed
could
well
reveal
laws
temperature
regions
was
higher
than
other
regions,
showed
an
increasing
trend
with
stirring
As
speed
increased,
resistance
moment
power
loss
larger
gearbox.
clockwise
rotation
driving
G4
counterclockwise
gear.
relevant
can
provide
theoretical
references
analysis
automotive
technical
support
profile
design
optimization.
