ABSTRACT
In
the
current
work,
study
examines
flow
patterns
and
heat
transfer
capabilities
of
tubes
with
various
spherical
dimple
configurations.
A
numerical
analysis,
supported
by
experimental
validation
on
a
reference
model,
was
conducted
circular
tube
an
alternating
path.
The
primary
goal
to
enhance
thermal
performance
inducing
mixing
vortex
flows.
impact
three
design
factors
thermal–hydraulic
investigated,
pipe
diameter
(DPD),
group
number
(DGN),
dimples
(NODs).
Dimpled
consistently
outperformed
smooth
in
due
increased
separation.
Both
increasing
Reynolds
decreasing
led
formation
patterns.
evaluation
factor
(PEF)
varied
across
different
For
DPD,
PEF
ranged
from
1.14
1.33;
for
DGN,
it
1.15
1.28;
NOD,
0.95
1.21,
all
within
range
4000–15,000.
At
6000,
configurations
NOD
terms
Nusselt
number.
improvements
25.7%
30.8%,
friction
21%
67%.
DGN
exhibited
wider
enhancement
25%
49.6%,
increase
37%
72%.
also
demonstrated
consistent
improvements,
increases
ranging
27.35%
31%
42%
74%.
Spherical
can
significantly
tubes,
so
best
configuration
depends
specific
application,
highest
performance,
1.33
PEF,
achieved
2
mm
(DPD
=
mm)
density
four
per
unit
area
(NOD
4).
Case Studies in Thermal Engineering,
Год журнала:
2024,
Номер
56, С. 104259 - 104259
Опубликована: Март 13, 2024
This
research
zeroes
in
on
improving
the
freezing
process
by
synergistically
employing
a
wavy
wall
and
fins.
To
enhance
cold
penetration,
phase
change
material
(PCM)
is
enriched
with
nanoparticles,
single-phase
model
adopted
due
to
low
nanoparticle
concentration.
The
numerical
simulations
leverage
Galerkin
method
validation
procedure
affirms
precision
of
code,
extensively
evaluating
impacts
ϕ
(concentration
additives)
dp
(particle
diameter).
With
an
increase
particle
diameter
(dp),
there
initial
19.76%
decrease
required
time,
succeeded
subsequent
50.56%
when
=
0.04.
Furthermore,
escalation
results
11.04%,
40.91%,
26.36%
reduction
completion
time
for
values
50,
40,
30
nm,
respectively.
Without
inclusion
powders,
solidification
lasts
84.8
s.
However,
introduction
optimal
powder
size,
this
duration
significantly
reduces
50.1
emphasizes
efficiency
improvements
attained
through
strategic
integration
wall,
fins,
PCM
infused
nanoparticles.
ABSTRACT
In
the
current
work,
study
examines
flow
patterns
and
heat
transfer
capabilities
of
tubes
with
various
spherical
dimple
configurations.
A
numerical
analysis,
supported
by
experimental
validation
on
a
reference
model,
was
conducted
circular
tube
an
alternating
path.
The
primary
goal
to
enhance
thermal
performance
inducing
mixing
vortex
flows.
impact
three
design
factors
thermal–hydraulic
investigated,
pipe
diameter
(DPD),
group
number
(DGN),
dimples
(NODs).
Dimpled
consistently
outperformed
smooth
in
due
increased
separation.
Both
increasing
Reynolds
decreasing
led
formation
patterns.
evaluation
factor
(PEF)
varied
across
different
For
DPD,
PEF
ranged
from
1.14
1.33;
for
DGN,
it
1.15
1.28;
NOD,
0.95
1.21,
all
within
range
4000–15,000.
At
6000,
configurations
NOD
terms
Nusselt
number.
improvements
25.7%
30.8%,
friction
21%
67%.
DGN
exhibited
wider
enhancement
25%
49.6%,
increase
37%
72%.
also
demonstrated
consistent
improvements,
increases
ranging
27.35%
31%
42%
74%.
Spherical
can
significantly
tubes,
so
best
configuration
depends
specific
application,
highest
performance,
1.33
PEF,
achieved
2
mm
(DPD
=
mm)
density
four
per
unit
area
(NOD
4).
