Heat exchangers are used widely in many fields, and various kinds of exchanger have been developed according to the requirement of the practical applications. Recently, heat exchangers that are highly efficient or compact have become more desirable from the viewpoint of energy conservation, and several new types have been developed, such as a compact fin tube type and a double tube type having an inner pipe with a special geometry. In this study, the flow and heat transfer characteristics of a petal-shaped double tube with a large wetted perimeter of six and five petals and five shallow petals and the effect of tube shape on the heat transfer and heat transfer efficiency were examined experimentally. The heat transfer of the double tube with a petal-shaped inner tube was increased because of the large wetted perimeter, but the pressure loss by friction increased. The optimal shape of the petal-shaped double tube with a high heat transfer performance and the greatest efficiency is discussed.

References

References
1.
Rădulescu
,
S.
,
Negoiţă
,
L. I.
, and
Onuţu
,
I.
,
2016
, “
Analysis of the Heat Transfer in Double and Triple Concentric Tube Heat Exchanger
,”
IOP Conf. Ser.: Mater. Sci. Eng.
,
147
, p.
012148
.
2.
Fuskele
,
V.
, and
Sarviya
,
R. M.
,
2012
, “
Experimental Investigations of Heat Transfer Enhancement in Double Pipe Heat Exchanger Using Twisted Dense Wire Mesh Insert
,”
Int. J. Adv. Eng. Res. Stud.
,
1
(2), pp.
5
9
.
3.
Promvonge
,
P.
,
Pathkool
,
S.
,
Pimsarn
,
M.
, and
Thianpong
,
C.
,
2012
, “
Heat Transfer Augmentation in Helical-Ribbed Tube With Double Twisted Tape Inserts
,”
Int. Commun. Heat Mass Transfer
,
39
(
7
), pp.
953
959
.
4.
Syed
,
K. S.
,
Ishaq
,
M.
,
Iqbal
,
Z.
, and
Huaan
,
A.
,
2015
, “
Numerical Study of an Innovative Design of a Finned Double-Tube Heat Exchanger With Variable Fin-Tip Thickness
,”
Energy Convers. Manage.
,
98
(
1
), pp.
69
80
.
5.
Pancholi
,
M.
, and
Virani
,
B.
,
2017
, “
A Basic Review on Triple Concentric Tube Heat Exchanger
,”
Sixth International Conference on Recent Trends in Engineering, Science & Management
, pp.
1213
1217
.
6.
Saurabh
,
P. D.
,
Khond
,
H.
,
Lele
,
M. M.
, and
Lovell
,
M. R.
,
2016
, “
CFD Analysis of a Triple Concentric Tube Heat Exchanger Having Water Flowing at Three Different Temperature
,”
Int. J. Curr. Eng. Technol.
(in press).
7.
Shakouchi
,
T.
,
Ozawa
,
R.
,
Iwasaki
,
F.
,
Tsujimoto
,
K.
, and
Ando
,
T.
,
2015
, “
Flow and Heat Transfer of Petal Shaped Double Tube—Effects of Pipe Geometry
,”
Fifth International Conference on Jets, Wakes and Separated Flows (ICJWSF2015),
Springer, Cham pp.
347
354
.
8.
Shakouchi
,
T.
,
Ozawa
,
R.
,
Tsujimoto
,
K.
, and
Ando
,
T.
,
2016
, “
Flow and Heat Transfer of Petal Shaped Double Tube (Water and Air-Water Bubbly Flow)
,”
JSME Mech. Eng.
,
3
(
6
), pp.
347
354
.
9.
Shokouhmand
,
H.
,
Salimpour
,
M. R.
, and
Akhavan-Behabadi
,
M. A.
,
2008
, “
Experimental Investigation of Shell and Coiled Tube Heat Exchangers Using Wilson Plots
,”
Int. Commun. Heat Mass Transfer
,
35
(
1
), pp.
84
92
.
10.
Seara
,
F. J.
,
Uhia
,
F. J.
,
Sieres
,
J.
, and
Campo
,
A.
,
2007
, “
A General Review of the Wilson Plot Method and Its Modifications to Determine Convective Coefficients in Heat Exchanger Devices
,”
Appl. Therm. Eng.
,
27
(
17–18
), pp.
2745
2757
.
You do not currently have access to this content.