Journal of Physics Conference Series,
Journal Year:
2024,
Volume and Issue:
2854(1), P. 012026 - 012026
Published: Oct. 1, 2024
Abstract
Interventional
blood
pumps
serve
as
a
crucial
component
for
temporary
mechanical
circulatory
support
in
the
treatment
of
heart
failure,
specifically
designed
to
improve
circulation
recovery
and
survival
rate
patients
undergoing
acute
cardiovascular
diseases.
This
study
aims
design
novel
interventional
pump
with
focus
on
achieving
exceptional
hydraulic
performance
superior
compatibility
based
numerical
simulation,
which
considers
interactions
between
upstream
(drainage
cannula)
downstream
(aorta)
flow
fields,
establishing
full-scale
field
analysis.
For
method,
Reynolds-Averaged
Navier-Stokes
(RANS)
equations
coupling
k-ɛ
turbulence
model
are
solved.
The
result
indicates
that
high
shear
stress
exists
around
leading
trailing
edges
impeller
blades
there
is
jet
at
outlet
impeller,
blade
edge,
dominant
regions
higher
hemolysis
occurrence.
It
also
noted
presence
an
generates
significant
vortex
structures
within
aorta.
To
effectively
reduce
index,
back-sweep
concept
applied
this
optimize
impeller’s
edge.
analysis
confirms
back
swept
edge
helps
pumps.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(1)
Published: Jan. 1, 2025
Axial-flow
pumps
have
complex
hydraulic
performance
under
diverse
conditions,
especially
low-flow
which
may
occur
rotational
stall
and
brings
serious
system
vibration.
By
combining
experiments
numerical
simulation
analysis,
the
fine
features
of
local
internal
flow
field
in
multi-flow
rate
conditions
are
accurately
reflected,
revealing
mechanism
changes
axial-flow
different
at
conditions.
As
decreased,
backflow
velocity
near
wall
area
inlet
pipe
circumferential
swirl
increased
gradually,
tip
leakage
vortex
(TLV)
pressure
surface
also
gradually.
Based
on
average
axial
V0
design
rate,
was
−1.18
−3.53
deep
condition.
The
maximum
vorticity
TLV,
secondary
5
×
106
S−2,
intensity
largest.
interaction
between
vortices
mainstream
intensifies
formation
development
passage
blocks
pipe.
Under
influence
comprehensive
factors,
entropy
production
channel
impeller
region
reached
condition,
both
were
above
22
10−2
kg
m2
s−3
K−1,
more
than
twice
that
outside
saddle
zone.
This
study
analyzed
instability
biased
from
multiple
levels
perspectives,
providing
a
basis
for
improving
future.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: March 3, 2025
To
investigate
the
internal
flow
mechanisms
during
cavitation
in
self-priming
pumps,
this
study
employs
numerical
simulations
based
on
RNG
k-ε
turbulence
model
coupled
with
Schnerr–Sauer
model.
The
vapor–liquid
two-phase
characteristics
at
critical
condition
are
analyzed
under
various
rates
and
rotational
speeds.
Based
vorticity
method,
Q
criterion,
λ2
Δ
λci
Ω
predictions
comparative
analyses
of
vortex
structures
pumps
have
been
conducted.
Additionally,
energy
loss
regions
pump
before
after
onset
has
using
theory
entropy
production.
results
demonstrate
that
criterion
yield
consistent
identification
outcomes
across
different
regions.
In
contrast,
produce
more
fragmented
vortices,
most
notably
gas–liquid
separation
chamber
area,
whereas
method
is
susceptible
to
disturbances
from
strong
shear
layers;
Energy
losses
not
directly
related
but
show
a
significant
correlation
intensity;
Changes
rate
greatest
impact
average
production
reflux
hole
region,
particularly
high
conditions;
difference
impeller
largest
occurs;
When
coefficient
constant,
vapor
volume
fraction
region
exhibits
positive
both
speed.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(5)
Published: May 1, 2025
Sediment-laden
surface
vortices
in
pump
sump
represent
a
three-phase
flow,
comprising
gas,
liquid,
and
solid
phases,
surpassing
the
complexity
of
clear
water
vortices,
which
has
also
more
serious
effect
on
hydraulic
machinery.
In
this
paper,
focusing
sediment-laden
free
model
experiment
was
employed
to
investigate
their
motion
characteristics.
The
spatiotemporal
evolution
been
captured
through
three-dimensional
velocity
testing,
revealing
particle
aggregation
dispersion
patterns
within
vortex
cores
at
various
stages.
Radial
core
accelerates
inward
movement
particles,
while
axial
enhances
vertical
transport.
scale
sandy
is
larger
than
that
approximately
1.2
times
size,
rotational
lower
for
with
maximum
velocities
1.04
0.5
m/s,
respectively.
suction
speed
6.1
initial
stage,
sediment-carrying
capacity
21
greater.
Finally,
mechanism
characteristics
transporting
sand
air
are
discussed,
along
detrimental
effects
sediment
erosion
research
findings
paper
have
significant
theoretical
engineering
values.
Energies,
Journal Year:
2024,
Volume and Issue:
17(23), P. 6157 - 6157
Published: Dec. 6, 2024
This
article
provides
a
comprehensive
review
of
key
approaches
to
suppressing
stall
flow
in
pumps,
offering
insights
enhance
pump
performance
and
reliability.
It
begins
by
outlining
the
formation
mechanisms
characteristics
stalls,
followed
an
in-depth
analysis
various
types.
The
discussion
highlights
passive
active
control
methods,
emphasizing
their
roles
phenomena.
Passive
flow-control
strategies,
including
surface
roughness,
grooves,
obstacles,
fixed
guide
vanes,
vortex
generators,
are
examined
with
focus
on
effectiveness
stall.
Similarly,
techniques,
such
as
jets
adjustable
explored
for
capacity
regulate
field
suppress
novelty
this
lies
its
exploration
methods
stall,
action
underlying
principles
formation.
findings
reveal
that
appropriate
measures
can
mitigate
laminar
separation
reduce
losses
associated
However,
careful
attention
must
be
given
optimal
arrangement
devices.
Finally,
limitations
current
implementations
combined
while
into
future
potential
advanced
technologies
regard
