第1'l卷第
6
期
2006
年
12
月
工程设计学报
Journal
of
Engineering
Design
一种自动洁洗式传热强化新元件
一一旋流口椭圆齿平带
彭德其刘桂英俞秀民金俊杰
3
(1.湖南工业大学帅科机械清洗研究所,湖南株洲
4120
饨,
Vo
1.
1
'l
No.6
f)
ec. 2006
2.
长沙理工大学机械工程学院,湖南长沙
410076;
3.
长沙华海节能设备公司,湖南长沙
410000)
摘
要:针对斜齿螺旋扭带的制造困难,提出了一种自动清洗式传热强化新元件
旋流口椭圆齿平带,每个椭圆
齿都是使平带自转的流体动力结构元素,平带两侧的旋流口使管内的部分液体形成螺旋线流,因而具有近似斜齿
螺旋扭带那样能够在较低流速下自转、实现管内污垢在线自动清洗的性能.同时流体经过椭圆齿后产生的大量涡
流、管内部分液体转变成的螺旋线流以及螺旋线流与轴向流线不断交错混合等三方面的综合作用,使管内对流传
热得到强化.对椭圆齿的齿距、斜角和旋流口三个因素进行了试验研究,结果表明:旋流口椭圆齿平带在管内流速
为
0.5
m/s
左右就能可靠旋转运行;相对于光滑螺旋扭带,旋流口椭圆齿平带的管内侧传热系数可提高
171%
;其
在管内流速为
0.625
m/s
时的流体阻力为
3.25
kPa/m
,流体阻力在一般工程许可的范围内.因此,旋流口椭圆齿平
带具有良好的综合性能,并且又容易制造,具有较高的工程应用价值.
关键词:自动清洗;椭圆齿平带;力矩;强化传热;流动阻力
中图分类号:
TK172
文献标识码
A
文章编号
1006-7
54X
(2006)
06-03
92-04
New
straight
strip-insert
with
elliptical
teeth
and
broken
edge
for
removing
fouling
and
enhancing
heat
transfer
PENG
De-qi
1
,
LIU
Gui-ying
2
,
YU
Xiu-min
1
,
JIN
Jun-jie
3
(1.
Shuaike
Mecha
口
ical
Clei
生口
ing
Institute
,
Hunan
Polytech
口
ic
University
,
Zhuzhou
412008
,
China;
2.
School
of
Mecha
口
ical
Engineering
,
Changsha
Uni
、
lersity
of
Science
and
Technology
,
Changsha
410076
,
China;
3.
Changsha
Huahai
Energy-Saving
Eq
uipment
Corporatio
口
Limited
,
Cha
口
gsha
410000
,
Chin
且)
Abstract:
Duc
to
thc
difficulty
of
manufacturing
twistcd
tapc
with
tccth
, a
ncw
componcnt
,
straight
strip-inscrt
with
clliptical
tccth
and
brokcn
cdgc
on
both
sidcs
,
which
could
automatical
ly
rcmovcd
fouling
and
cnhanccd
hcat
transfcr
,
was
put
forward.
Each
tooth
was
a
fluidic
powcr
structurc
clcmcnt
to
drivc
thc
inscrt
sclf-rotatc.
For
thc
brokcn
cdgc
,
part
of
thc
fluid
in
tubcs
formcd
spiral
flow.
Thcrcforc
,
this
straight
strip
could
sclf-rotatc
at
low
flowing
spccd
and
rc
movc
thc
fouling
on
tubc
wall
automatically
just
likc
twistcd
strip
with
obliquc
tccth.
Mcantimc
,
thc
convcction
hcat
transfcr
was
grcatly
cnhanccd
bccausc
of
thc
thrcc
factors:
much
cddy
flow
bchind
thc
clliptical
tccth
,
fluid
flow's
changing
into
spiral
flow
,
combination
and
scparation
of
spiral
flow
and
axial
flow.
Expcrimcntal
rcscarch
was
conductcd
on
thc
thrcc
factors
including
cl
liptical
tccth
distancc
,
tccth
anglc
and
brokcn
cdgc.
Thc
rcsults
showcd
,
comparing
to
twistcd
tapc
,
this
ncw
inscrt
could
work
rcliably
at
thc
flow
spccd
of
0.5
m/s
in
tubc
and
makc
thc
hcat
transfcr
cocfficicnt
insidc
tubcs
incrcascd
by
171
%.
Thc
flowing
rcsistancc
was
in
thc
rangc
of
in
dustrial
pcrmission
,
which
cqualcd
to
3.25
kPa/m
whcn
thc
flow
vclocity
in
tubc
was
0.625
m/s.
Thcrcfo
时,
this
strip
had
good
comprchcnsivc
pcrformancc
and
could
bc
manufacturcd
casily;
it
had
grcat
significancc
to
industrial
application.
l
改稿日期:
2006-02-04.
基金项目:国家科技部..火矩"计划资助项目
(99D23ID7700584)
;教育部重点项目资助
(00208)
;湖南省基金资助项目
(02
Jj
Y2070).
作者简介:彭德其(1
972-)
,男,湖南衡山人,副教授,华南理工大学博士生,从事传热强化与节能、气体净化技术等研究,
E-m
且
il:
pengshuaike@163.ωm.