Chemical Engineering and Processing - Process Intensification,
Journal Year:
2023,
Volume and Issue:
193, P. 109558 - 109558
Published: Sept. 23, 2023
Gas-liquid
hydrodynamics
of
a
micro-structured
device
(fractal
flow
mixer)
was
experimentally
investigated.
Experiments
were
conducted
for
range
liquid-to-gas
superficial
velocity
ratios
(VSL/VSG).
High-speed
imaging
used
to
identify
the
regimes
inside
microchannels
at
different
VSL/VSG.
At
VSL/VSG,
two
or
more
observed
simultaneously
in
micro-channels.
Consequently,
new
regime
map
developed.
An
optical
probe
measure
bubble
mean
size
and
velocity.
The
effect
VSL/VSG
towards
size,
velocity,
frequency
analysed.
decreases
with
increase
which
can
be
attributed
uniform
shearing
gas
slugs
across
all
channels.
To
check
consistency
fractal
mixer
producing
bubbles
over
single
experiment
run,
global
relative
standard
deviation
(RSD)
used.
able
generate
equal
distribution
16
outlets
maintain
Taylor
.
However,
depending
on
GB
GS
vary
certain
extent,
governed
by
capillary
back-pressure.
Numerical Heat Transfer Part A Applications,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 26
Published: April 11, 2024
Two
models
of
heat
transfer
channels
for
concentric
cylindrical
exchangers
with
porous
ribs
are
developed
herein
to
optimize
the
efficiency
storage
reactor
channels.
Rings
and
spiral
added
smooth
circular
tube
inside
reactor.
Spoiler
holes
arranged
in
reduce
stagnation
area
around
ribs.
The
effects
coolant
(SiO2–H2O
nanofluids),
rib
shapes,
number
on
overall
performance
system
were
numerically
investigated.
Results
revealed
that
0.5%
mass
fraction
nanofluids
most
suitable
working
fluid
channel
thermal
transport
simulated
Reynolds
range.
Both
ring
reinforce
exchange
pipe
varying
degrees.
Spiral
perforated
have
superior
drag
reduction
compared
comprehensive
performances
always
higher
than
those
under
all
conditions.
