Study on heat transfer characteristics of elliptical heat exchange tubes under acoustic streaming
International Journal of Heat and Fluid Flow,
Год журнала:
2025,
Номер
112, С. 109738 - 109738
Опубликована: Янв. 5, 2025
Язык: Английский
Enhancement of thermofluid characteristics via a triple-helical tube heat exchanger
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Фев. 26, 2025
Abstract
An
investigation
of
the
thermal
and
hydraulic
performance
a
novel
triple-helical
tube
heat
exchanger,
THTHE,
is
presented.
The
design
modified
DHTHE
created
by
adding
third
to
tube.
passage
expected
enhance
as
result
an
increase
in
temperature
gradient
between
hot
cold
fluids.
effects
coil
radius,
inner
annulus
spacing,
water
inlet
temperature,
direction
flow
arrangement,
Dean
number
were
explored.
Five
test
samples
with
different
radii
150
mm,
125
90
mm
spacings
6.2
9
12
examined.
designed,
fabricated,
tested
demonstrate
influence
parameters
on
exchanger.
experimental
runs
conducted
side
T
h,i
ranging
from
50:80
°C.
Moreover,
at
400
≤
De
h
5500,
corresponding
Reynolds
2700
Re
31,000.
Compared
double-helical
THTHE
resulted
higher
Nusselt
146.1%
109.3%
for
both
counterflow
parallel-flow
arrangements,
respectively.
Furthermore,
lowering
source
80
50
°C
results
60.6%
60.6%,
no
pumping
power.
Additionally,
decreasing
radius
spacing
significant
Nu
occurs
58.2%
130.4%,
A
general
correlation
was
presented
predicting
,
f
ε
.
Язык: Английский
Synergistic effect of outer helical fins and hybrid nanofluid on hydrothermal performance of shell and two-coil heat exchanger
Case Studies in Thermal Engineering,
Год журнала:
2025,
Номер
unknown, С. 106238 - 106238
Опубликована: Май 1, 2025
Язык: Английский
Investigation of a tube in tube conically coil heat exchanger thermal and fluid flow performance characteristics
International Journal of Air-Conditioning and Refrigeration,
Год журнала:
2025,
Номер
33(1)
Опубликована: Май 1, 2025
Abstract
The
thermal
and
fluid
flow
characteristics
of
a
tube
in
conical
coiled
heat
exchanger
(
TTCCHE)
were
experimentally
conducted.
This
research
tends
to
improve
the
performance
curved
tube.
effects
different
design
parameters,
including
coil
torsions,
λ
;
inclination
angles,
α
Dean
number,
Dn
arrangements
for
both
inner
annulus
sides
examined.
Three
test
samples
with
,
values
0.0352,
0.0713,
0.1115
designed,
manufactured,
tested
parallel
counterflow
arrangments.
0°,
45°,
90°
also
experimental
runs
carried
out
at
from
2000
≤
i
10,833
(corresponding
12,300
Re
62,600)
side
430
o
3200
2500
18,500)
annulus.
results
revealed
that
TTCCHE
torsion
=
0.0352
significant
increase
Nu
by
40.9%
32.2%,
respectively.
angle
has
noticeable
influence
on
increasing
23.7%
21.6%,
respectively,
compared
45°.
maximum
thermohydraulic
criteria
reach
1.45
2.26
New
correlations
predict
f
presented.
Язык: Английский