Powder Technology,
Год журнала:
2023,
Номер
434, С. 119268 - 119268
Опубликована: Дек. 13, 2023
Continuum
modelling
of
fluid-particle
multiphase
flows
is
often
challenging
when
the
solid
phase
becomes
dense.
In
this
work,
a
micro-macro
approach
combining
microscale
discrete
element
method
and
averaging
used
to
explore
normal
stress
(pressure)
better
describe
dense
flows.
Various
effects
Young's
modulus,
Poisson
ratio,
sliding
friction,
rolling
friction
are
examined
an
exponential
relationship
between
pressure
volume
fraction
proposed.
With
implemented,
Two-Fluid
Model
can
reproduce
steady
discharge
particles
from
hoppers,
which
regarded
as
critical
test
particle
flow
for
TFM.
The
generality
model
tested
in
variety
cases,
such
different
hopper
angles,
orifice
widths
fill
heights.
Comparisons
present
with
previous
models
also
made
enhance
understandings
Chemical Reviews,
Год журнала:
2023,
Номер
123(5), С. 2242 - 2275
Опубликована: Янв. 5, 2023
Engineered
materials
are
ubiquitous
throughout
society
and
critical
to
the
development
of
modern
technology,
yet
many
current
material
systems
inexorably
tied
widespread
deterioration
ecological
processes.
Next-generation
can
address
goals
environmental
sustainability
by
providing
alternatives
fossil
fuel-based
reducing
destructive
extraction
processes,
energy
costs,
accumulation
solid
waste.
However,
sustainable
faces
several
key
challenges
including
investigation,
processing,
architecting
new
feedstocks
that
often
relatively
mechanically
weak,
complex,
difficult
characterize
or
standardize.
In
this
review
paper,
we
outline
a
framework
for
examining
in
discuss
how
recent
developments
modeling,
machine
learning,
other
computational
tools
aid
discovery
novel
materials.
We
consider
these
through
lens
materiomics,
an
approach
considers
holistically
incorporating
perspectives
all
relevant
scales,
beginning
with
first-principles
approaches
extending
macroscale
design
from
bottom-up.
follow
examination
methods
currently
applied
select
examples
development,
particular
emphasis
on
bioinspired
biobased
materials,
conclude
opportunities
open
challenges.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2020,
Номер
8(16), С. 6142 - 6156
Опубликована: Апрель 3, 2020
Biomass
is
a
renewable
and
sustainable
energy
resource.
Current
design
of
biomass
handling
feeding
equipment
leverage
both
experiments
numerical
modeling.
This
paper
reviews
the
state-of-the-art
discrete
element
methods
(DEM)
for
flow
milled
(Part
I),
accompanied
by
comprehensive
review
on
continuum-based
computational
models
II).
The
present
DEM
primarily
focused
features
suitability
various
particle
shape
different
types
because
predominant
attribute
controlling
behavior
complex-shaped
granular
material.
general
strengths
weaknesses
in
applicability
those
modeling
are
summarized.
In
particular,
comments
provided
to
balance
model
capabilities
cost
development
models.
To
our
best
knowledge,
this
first-of-its-kind
specifically
biomass.
Our
study
indicates
that
current
require
further
development,
calibration,
validation
based
deep
understanding
contact
mechanics
experimental
data
support
before
they
can
be
reliably
used
predictive
simulations
systems.
Powder Technology,
Год журнала:
2022,
Номер
405, С. 117535 - 117535
Опубликована: Май 21, 2022
Interest
in
biofuels
has
grown
recent
years.
Unfortunately,
biofuel
refineries
are
unable
to
operate
at
full
capacity
due
handling
and
feeding
issues
as
the
systems
for
biomass
often
poorly
designed.
To
inform
more
effective
reliable
systems,
this
study
presents
mechanical
(moisture,
particle
size/distribution,
bulk
density,
compressibility,
elastic
recovery)
flow
characterization
(critical
arching
distance
feed
rate
a
wedge
hopper
screw
feeder)
of
corn
(Zea
mays
L.)
stover.
Results
showed
that
size
most
significant
effect
on
flowability,
while
moisture
content
plays
role
sample
with
large
particles.
For
example,
nominal
3
mm
10%
was
44
lb./h,
compared
24
lb./h
same
but
larger
25
mm.
Samples
sizes
contents
30%
exhibited
much
smaller
differences
rate.
The
former
latter
46
such
difference
within
experimental
measurement
uncertainty.
Additionally,
critical
increases
increasing
exhibits
small
dependence
content.
overall
concludes
milled
stover
feedstocks
particles
exhibit
substantially
better
flowability.
International Journal of Lightweight Materials and Manufacture,
Год журнала:
2022,
Номер
5(2), С. 251 - 266
Опубликована: Фев. 20, 2022
Magnesium
and
magnesium
based
alloys
biomaterials
are
considered
the
most
viable
pragmatic
choice
of
selection
as
biomedical
alternatives
for
tissue
repair
damaged
bones,
vascular
other
biological
disorders.
Considering
sensitivity
health
implication
implanting
foreign
matter
into
human
system,
extensive
studies
required
before
clearance
clinical
trials
is
given.
This
often
requires
rigorous
experimental
evaluations
biomechanical
biodegradation
properties
such
biomaterials,
which
expensive,
time
consuming
practically
demanding,
several
validation
protocols.
The
technical
advances
in
computing
power
well
computational
modeling
techniques,
finite
element
analysis,
have
been
sort
to
address
these
limitations,
but
very
little
has
catalogued
reviews
on
basis
their
utilization
sundry
issues.
paper
attempts
fill
this
gap
by
assessing
from
literature,
how
effective
application
analysis
evaluation
behaviour
Mg-based
systems
use
stents,
screws,
staples,
implants
orthopedic
cardiovascular
applications.
review
focuses
factors
geometric
profile
Mg
material
applicable
physical
constitutive
laws,
design
parameters,
boundary
conditions
stipulated,
simulation
outcomes,
agreements
with
data,
influence
potentials
real
life
designs
biomaterial
systems.
Also,
challenges
that
could
affect
effectiveness
directions
future
improvements,
were
covered.
will
be
immense
benefit
researchers,
designers
clinicians.
Powder Technology,
Год журнала:
2023,
Номер
427, С. 118707 - 118707
Опубликована: Июнь 8, 2023
Physical
experiments
and
discrete
element
model
(DEM)
simulations
are
conducted
to
evaluate
particle
characteristics
operation
parameter
effects
on
screw
feeding
performance
for
rotary
shear-milled
Douglas
fir.
Three
metrics
used:
mass
flow
rate,
shaft
driving
torque,
specific
energy
consumption.
The
impact
of
size,
size
distribution
(PSD),
rotational
speed
(rpm),
hopper
dimensions
the
investigated.
All
employed
reveal
superior
flowability
2-mm
particles
in
contrast
larger
6-mm
counterpart.
Remarkably,
wider
PSD
results
poorer
than
two
mono-sized
particles,
proving
enhancement
achieved
by
narrower
woody
feedstock.
More
importantly,
DEM
unveil
PSD-induced
degradation
is
attributed
mechanical
interlocking
segregation
effects.
Furthermore,
higher
rpm
causes
rate
at
cost
consumption
due
viscous
dissipation
changes
pattern.
Frontiers in Energy Research,
Год журнала:
2022,
Номер
10
Опубликована: Май 5, 2022
Biomass
has
potential
as
a
carbon-neutral
alternative
to
petroleum
for
chemical
and
energy
products.
However,
complete
replacement
of
fossil
fuel
is
contingent
upon
efficient
processes
eliminate
undesirable
characteristics
biomass,
e.g.,
low
bulk
density,
variability,
storage-induced
quality
problems.
Mechanical
size
reduction
via
comminution
processing
operation
engineer
favorable
biomass
flowability
in
handling.
Crumbler
rotary
shear
mill
been
empirically
demonstrated
produce
more
uniformly
shaped
particles
with
higher
than
hammermilled
biomass.
This
study
combines
modeling
experimentation
unveil
fundamental
understandings
the
relation
between
granular
particle
flow
behavior,
which
elucidate
underlying
mechanisms
guide
selection
critical
parameters.
For
this
purpose,
impact
material
attributes,
including
(2–6
mm),
shape
(briquette,
chip,
clumped-sphere,
cube,
etc.),
surface
roughness,
on
angle
repose
(AOR)
milled
pine
chips
were
investigated
using
discrete
element
method
(DEM)
simulations.
Forest
Concepts
system
used
within
same
range
considered
DEM
AOR
different
sets
these
measured
experimentally
benchmark
results
against
experimental
data.
Specific
consumption
moisture
content
are
technoeconomic
analysis.
Our
show
that
smaller
(2
mm)
achieves
better
followability
(i.e.,
AOR)
while
cost
significantly
density
almost
6-mm
particles.
2-mm
size,
Crumbles
from
veneer
have
properties
chips.
Contrarily,
no
significant
difference
was
observed
two
materials
size.
Furthermore,
simulations,
mechanical
interlocking
found
dominant
factor
determining
complex-shaped
such
pine,
cannot
be
accurately
captured
by
simple
shapes
(e.g.,
mono-sphere)
rolling
resistance
model.
Conversely,
clumped-sphere
model
alleviates
limitation
without
increasing
computational
can
accurate
representation
when
simulating
free-flow
behavior.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2023,
Номер
11(31), С. 11482 - 11489
Опубликована: Июль 28, 2023
Handling
milled
biomass
particles
in
equipment
like
hoppers
and
feeders
has
been
a
long-lasting
challenge
the
bioenergy
industry
because
of
poor
flowability
these
low
density,
high
aspect
ratio,
irregularly
shaped
particles.
The
inner
pores
woody
complicate
granular
flow
behavior.
When
water
exists
intra-
inter-particle
with
sizes
ranging
from
nanometers
to
micrometers,
intricate
processes
such
as
hydrogen
bonding,
capillary
effects,
liquid
bridge,
lubrication
occur.
However,
knowledge
how
alter
bulk
behavior
is
severely
lacking.
This
study
investigates
loblolly
pine
chips
wedge-shaped
considering
moisture
content.
fiber
saturation
point
(FSP)
material
(30%)
was
determined
through
differential
scanning
calorimetry
analysis.
compressibility
shear
resistance
were
found
increase
increased
content
meso-scale
testing.
Moreover,
hopper
simulations
suggest
that
effective
discharge
rate
decreases
by
50%
increasing
up
FSP,
beyond
which
no
apparent
influence
on
discharge.
highlights
importance
quantifying
FSP
understanding
at
various
contents
sheds
light
trouble-free
handling
wet
industry.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2024,
Номер
12(10), С. 4213 - 4223
Опубликована: Фев. 28, 2024
Numerical
modeling
of
granular
biomass
material
flow
in
handling
operations
is
indispensable
to
decipher
upsets,
commonly
manifested
as
clogging
and
jamming
hoppers
augers.
With
a
computational
tool
developed
based
on
smoothed
particle
hydrodynamics
(SPH),
we
simulated
the
hopper
auger
feeding
six
materials.
The
good
agreement
between
experimental
numerical
rates
demonstrated
capability
SPH
solver
complicated
impact
physical
parameters
investigated,
major
results
show
that
pattern
controlled
by
shear
band
evolution;
collectively
influenced
opening
size,
wall
friction,
packing,
compressibility
feed
rate
minimal.
These
parametric
studies
validate
solver's
robustness
simulating
equipment
demonstrate
can
provide
insights
about
mechanics
facilitate
design
optimize
operations.