Laboratory study of orifice jets from a pressurized pipe
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(3)
Published: March 1, 2025
Orifice
jet
through
a
small
opening
or
orifice
into
surrounding
fluid
exhibits
intricate
dynamics,
encompassing
the
interaction
of
with
fluid.
Although
dynamics
simple
jets
has
been
extensively
studied,
there
are
still
unresolved
issues
that
need
to
be
addressed.
In
this
study,
we
experimentally
investigated
characteristics
non-buoyant
emerging
from
sharp-edged
located
in
wall
pipe
constant
flow
rate.
Specifically,
examined
how
ratio
between
variable
rate
upstream
influences
not
only
trajectory
but
(for
first
time
authors'
knowledge)
also
velocity-related
features.
Particle
image
velocimetry
measurements
were
performed
explore
velocity
fields
near
and
intermediate
regions
data
analyzed
terms
time-averaged
components,
turbulent
intensities,
Reynolds
shear
stresses,
vorticity,
Q-criterion.
The
transversal
profiles
shown
their
Gaussianity
via
skewness
kurtosis.
Thus,
second-order
statistics
turbulence
fluctuations
carried
out.
Moreover,
spectral
analysis
was
after
Taylor
hypothesis
verification
proved
net
scale
separation
guaranteed
develop
inertial
sub-range.
influence
on
behavior
is
and,
particular,
how,
as
parameter
decreases,
moves
away
typical
axisymmetric
features
round
jet.
addition,
spectra
used
identify
potential
core
large-scale
organization
zones,
highlighting
effect
extension
region
mixing
layer.
Language: Английский
Algorithm for assessing the level of cooling channel contamination in injection mold
Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 13, 2025
The
condition
of
the
cooling
channels
injection
mold
has
a
significant
impact
on
rate
and
final
product
quality.
However,
there
is
no
simple
method
to
assess
whether
are
clean
or
need
cleaning.
volume
flow
pressure
drop
in
medium
were
measured
water
compressed
air
channels.
Based
experiment
theoretical
model
it
was
shown
that
using
function
(derived
article)
for
different
supply
air,
possible
calculate
parameters
hydraulic
resistance
flow,
even
if
used
measurements.
An
algorithm
assessing
contamination
level
proposed.
developed
allows
an
objective
assessment
channel
contamination.
Language: Английский
Numerical Simulation Study of an Artificial Percolation Riverbed and Its Hydraulic Characteristics under Different Reynolds Numbers
Water,
Journal Year:
2024,
Volume and Issue:
16(19), P. 2791 - 2791
Published: Sept. 30, 2024
The
direct
extraction
of
clear
water
from
a
sandy
river
is
difficult
task
and
can
only
be
achieved
through
specific
engineering
measures.
This
paper
proposes
an
artificial
percolation
riverbed
structure
for
extracting
clean
rivers,
using
numerical
simulation
to
study
the
flow
field
distribution
characteristics
under
conditions.
main
conclusions
are
as
follows:
When
vortex
tube
opening
rate
1.4%,
with
or
without
hole
has
little
influence
on
in
riverbed,
purpose
while
constructing
helical
field.
axial
velocity
circumferential
cross-section
different
Reynolds
numbers
show
low-flow
close
center
tube,
high-flow
side-wall
area.
average
trend
increasing
then
decreasing
along
axis
direction
sediment
transport
flume.
mean
toward
flume
both
decreasing.
At
junction
flume,
there
obvious
pressure
changes,
changes
drastically
same
horizontal
line.
Along
bottom
line
at
obviously
greater
than
that
mainly
concentrated
vicinity
maximum
value
intensity
generally
occurs
With
increase
number,
overall
trend,
more
complex.
helps
elucidate
it
provides
reference
basis
future
riverbeds
rivers.
Language: Английский