Desalination and Water Treatment,
Journal Year:
2024,
Volume and Issue:
319, P. 100498 - 100498
Published: June 7, 2024
Oxidation
ditch
(OD)
as
a
widely
used
process
in
wastewater
treatment
plants
(WWTPs)
usually
produces
low-flow
zones
at
the
bottom,
which
leads
to
potential
sludge
deposition.
In
response
this
issue,
study
optimized
rectangular
cross-section
of
OD
by
proposing
U-shaped
configuration,
and
numerical
simulation
method
(Flunet
6.3.26)
simulate
hydraulic
characteristics
with
two
types
cross-section.
Comparative
analysis
simulated
flow
field
structure
gas-phase
distributions
between
cross-sections
indicates
that
"U-shaped"
exhibits
superior
characteristics,
can
provide
foundation
for
further
advancements
design.
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences,
Journal Year:
2024,
Volume and Issue:
116(2), P. 51 - 58
Published: May 4, 2024
This
paper
investigates
heat
transfer
in
a
horizontally
oriented
tubular
exchanger
through
comprehensive
examination
of
both
numerical
simulations
and
experimental
analyses.
The
primary
focus
is
on
copper
as
the
material
interest,
specifically
examining
an
inner
tube
with
14
mm
internal
diameter
1
thickness,
well
outer
29
external
thickness.
In
addition
to
these
components,
two
perforated
pipes
diameters
11
20
are
incorporated;
contributing
overall
length
measuring
281
mm.
Notably,
perforation
pipe
features
5
hole
its
periphery.
A
assessment
was
conducted
appraise
coefficients
within
straightforward
exchanger.
mass
flow
rate
chilled
water
annular
space
fluctuated
between
0.01
kg/sec
0.11
kg/sec,
while
steady
hot
remained
constant
at
kg/sec.
Inlet
temperatures
for
were
established
55
°C,
75
85
cold
maintaining
consistent
inlet
temperature
°C
throughout
experiment.
Heliyon,
Journal Year:
2024,
Volume and Issue:
10(15), P. e35718 - e35718
Published: Aug. 1, 2024
Ground
heat
exchanger
(GHE)
is
the
most
crucial
element
of
a
ground
source
pump
(GSHP)
system
for
building
cooling
and
heating
by
utilization
geothermal
energy.
Therefore,
intending
to
enhance
performance
GHE,
present
study
conducts
computational
investigation
thermal
modified
spiral
tube
vertical
GHEs.
Several
modifications
uniform-pitched
GHE
are
made
increase
its
performance.
Some
introduced
as
variable-pitched
where
inlet
pipes
densified
in
lower
part
GHEs
reducing
pitch
distance.
Conversely,
some
modifications,
position
outlet
straight
pipe
changed.
Water
considered
working
fluid
temperature
water
maintained
fixed
at
300.15
K.
After
extensive
analysis,
it
evident
that,
when
placed
outside
coil,
there
7.67
%
enhancement
than
traditional
GHE.
However,
like
not
significant
improve
due
quick
saturation
soil
around
pipes.
To
have
balance
between
transfer
rate
pressure
drop,
capability
(TPC)
coefficient
improvement
Processes,
Journal Year:
2025,
Volume and Issue:
13(3), P. 835 - 835
Published: March 12, 2025
This
study
investigates
the
effects
of
novel
pipe
cross-section
designs
on
thermal,
hydraulic,
and
exergetic
performance
a
double-pipe
heat
exchanger,
aiming
to
identify
most
efficient
design
for
industrial
applications.
Four
cross-sections
are
proposed:
Case
1
(rounded
square),
2
(hexagonal),
3
(triangular),
4
(star-like),
all
maintaining
same
inlet
area
as
base
model
(circular).
A
3D
CFD
using
Finite
Volume
Method
realizable
k-ε
turbulence
is
employed
analyze
under
turbulent
flow
conditions
(Re
=
3000–20,000).
Key
metrics,
including
Nusselt
number,
overall
transfer
coefficient,
pressure
drop,
exergy
destruction,
evaluated.
The
results
show
that
achieves
7%
increase
in
number
at
Re
3000
2%
20,000,
while
exhibits
180%
improvement
coefficient
13,100.
However,
4’s
higher
drop
reduces
its
compared
model.
demonstrates
best
thermal
characteristics,
making
it
suitable
