AIChE Journal,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 20, 2024
Abstract
This
article
aimed
to
study
the
characteristics
of
chaotic
advection
and
mass
transfer
viscous
liquid–liquid
flows
in
a
novel
3D
serpentine
microchannel
(TSM)
with
hybrid
structures.
The
TSM
its
corresponding
experimental
setup
are
established,
CFD
model
is
verified
through
flow
field
visualization
experiments.
Results
reveal
that
efficient
convection
achieved
continuous
irregular
spatial
fluid
deformation.
Lyapunov
exponents
greater
than
zero
indicate
existence
behavior,
maximum
lineal
stretch
rate
λ
M
increases
linearly
characteristic
Reynolds
number.
evaluated
by
diffusion
number
Φ
synergy
Fc
quantitatively.
mixing
index
MI
shows
an
increasing
trend
as
increases,
while
effectiveness
ME
decreases
outlet
Re
O
decreases.
relationships
relationship
established.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Jan. 29, 2024
Abstract
The
oxidative
dehydrogenation
of
propane,
primarily
sourced
from
shale
gas,
holds
promise
in
meeting
the
surging
global
demand
for
propylene.
However,
this
process
necessitates
high
operating
temperatures,
which
amplifies
safety
concerns
its
application
due
to
use
mixed
propane
and
oxygen.
Moreover,
these
elevated
temperatures
may
heighten
risk
overoxidation,
leading
carbon
dioxide
formation.
Here
we
introduce
a
microchannel
reaction
system
designed
within
an
aqueous
environment,
enabling
highly
selective
active
propylene
production
at
room
temperature
ambient
pressure
with
mitigated
risks.
A
selectivity
over
92%
rate
19.57
mmol
m
Cu
−2
h
−1
are
simultaneously
achieved.
This
exceptional
performance
stems
situ
creation
active,
oxygen-containing
catalytic
surface
activation,
enhanced
transfer
via
enlarged
gas-liquid
interfacial
area
reduced
diffusion
path
by
establishing
Taylor
flow
using
custom-made
T-junction
microdevice.
offers
appealing
approach
accelerate
gas-liquid-solid
reactions
limited
solubility
gaseous
reactant.
AIChE Journal,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Abstract
Piezoelectric
pulsation‐driven
glass
nozzles
are
capable
of
generating
monodisperse
droplets
through
liquid
jet
breakup.
Due
to
the
lack
fundamental
understanding
this
process,
how
ensure
uniform
droplet
generation
with
a
specified
size
for
liquids
specific
rheological
properties
remains
unknown.
In
work,
complete
atomization
process
including
phenomena
in
and
outside
nozzle
has
been
described
by
new
multi‐physics
model,
where
expensive
in‐nozzle
simulation
can
be
rigorously
replaced
semi‐empirical
relationship.
This
computationally
efficient
model
allowed
us
systematically
quantitatively
explore
influence
different
material
operating
parameters
on
It
was
found
unintuitively
that
surface
tension
negligible
its
distribution.
The
independent
radius
under
condition
constant
inflow
rate.
Moreover,
detailed
guideline
established
achieve
on‐aim
control
atomized
droplets.
Small,
Journal Year:
2023,
Volume and Issue:
20(14)
Published: Nov. 21, 2023
Abstract
Electrocatalytic
nitrogen
reduction
reaction
(eNRR)
is
a
promising
method
for
sustainable
ammonia
production.
Although
the
majority
of
studies
on
eNRR
are
devoted
to
developing
efficient
electrocatalysts,
it
critical
study
influence
mass
transfer
because
poor
N
2
efficiency.
Herein,
novel
bubble‐based
microreactor
(BBMR)
proposed
that
efficiently
promotes
behavior
during
using
microfluidic
strategies.
The
BBMR
possesses
abundant
triphasic
interfaces
and
provides
spatial
confinement
accurate
potential
control,
ensuring
rapid
dynamics
improved
performance,
as
confirmed
by
experimental
simulation
studies.
yield
over
Ag
nanoparticles
can
be
enhanced
31.35
µg
h
−1
mg
cat.
,
which
twice
H‐cell.
Excellent
improvements
also
achieved
Ru/C
Fe/g‐CN
catalysts,
with
5.0
8.5
times
increase
in
yield,
respectively.
This
work
further
demonstrates
significant
effect
performance
an
effective
strategy
process
enhancement
through
electrode
design.
Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(7)
Published: July 1, 2024
The
present
study
has
numerically
explored
the
mechanism
of
interface
evolution
and
internal
flow
circulations
during
droplet
formation
in
two-phase
through
a
planar
T-microchannel.
two-dimensional
unsteady
form
conservative
level
set
equation
coupled
with
Navier–Stokes
equations
been
solved
using
finite
element
method.
range
parameters
include
contact
angle
(θ)
from
120°
to
180°,
rate
ratio
(Qr)
0.1
10
for
low
capillary
number
(Cac≤10−2).
indicates
that
surface
wettability
plays
crucial
role
influencing
temporal
interface.
circulation
is
controlled
by
axial
radial
velocities
primarily
influenced
shear
stress.
newly
introduced
novel
“interface-to-neck
ratio”
parameter
provided
another
platform
investigate
pinch-off
dynamics
droplets.
Moreover,
phenomenon
initiated
driven
Laplace
pressure,
defined
three
distinct
approaches:
pressure
difference
method,
determination
minimum
local
radius
curvature
on
rear
side,
calculation
neck
width.
predictive
correlations
have
established
estimate
characteristics
as
function
angle.
findings
reported
significant
implications
design
dispensing
systems
depend
critical
regulating
parameter.
Synthesis,
Journal Year:
2024,
Volume and Issue:
56(19), P. 2955 - 2962
Published: May 2, 2024
Abstract
Gas–liquid
oxidation
processes,
despite
their
wide
application
in
the
chemical
industry,
still
pose
considerable
safety
concerns.
Microchemical
technology
has
received
high
recognition
for
its
intrinsic
performance
and
process-intensification
capability
hazardous
reactions.
This
Short
Review
offers
a
comprehensive
summary
on
how
microchemical
can
be
employed
to
achieve
gas–liquid
processes
continuous
synthesis
of
chemicals
safe,
efficient,
controlled
manner.
Herein,
we
discuss
key
aspects
dispersion
hydrodynamics,
as
well
mass
transfer
characteristics
microscale,
present
representative
cases
microflow
reactors.
Finally,
current
challenges
industrial
applications
potential
academic
research
directions
are
presented.
1
Introduction
2
Microbubble
Generation
Technology
Gas–Liquid
Oxidation
Reactions
3
Hydrodynamic
Mass-Transfer
Characteristics
Microreactors
4
5
Conclusion
Outlook
AIChE Journal,
Journal Year:
2023,
Volume and Issue:
70(5)
Published: Dec. 13, 2023
Abstract
The
flow
characteristics
of
void
fraction
and
specific
surface
area
are
important
to
predict
the
mass
transfer
reaction
performances
in
gas–liquid
microreactors.
However,
models
trends
for
two
parameters
different
patterns
remain
ununified
insufficient.
Accordingly,
this
work
first
time
studies
a
very
wide
pattern
range
(Taylor,
short
bubble,
bubbly,
bubble
swarm
flow).
results
show
that
at
same
rates,
decreases
with
size
Taylor
but
is
totally
opposite
bubbly
flow.
Importantly,
variation
independent
size.
Finally,
based
on
size,
general
developed.
This
provides
new
direction
unification
characteristics.
Accurate
regulation
of
the
bubble
length
determines
microchannel
reaction
performance,
but
existing
methods
focus
on
construction
complex
generation
structures
with
high
operating
requirements.
Accordingly,
for
flow-focusing
microchannel,
this
study
proposes
a
convenient
method
that
varies
gas
inlet
kinetic
energy
to
adjust
length.
The
results
show
can
be
easily
regulated
by
changing
channel
width,
and
size
is
markedly
reduced
via
expanding
which
first
time
breaks
traditional
cognition
becomes
large
width
in
T-junction.
Besides,
reason
behind
formation
smaller
bubbles
wider
jointly
revealed
analyzing
two-phase
interface
behaviors
T-junction
microchannels.
Especially,
new
variable
(the
liquid
equivalent
residence
time)
proposed
describe
interaction
between
two
phases,
design
criterion
reach
minimal
Finally,
considering
effect,
universal
model
containing
ratio
Weber
numbers
capillary
number
developed,
shows
its
excellent
performance
microchannels
used
work
other
studies.
