Turbulator is recognized as a method to increase the performance of the heat exchanger. Turbulator in the form of V-cut twisted tape insert could help to increase the performance by enhancing the coefficient of the heat transfer. This paper proposes a new design of V-cut twisted tape insert (VTT) with different width ratio (w/W), which investigated on the heat transfer enhancement, in the form of Nusselt number (Nu) and friction factor (f) characteristics. Three different width ratios (w/W) 0.32; 0.38 and 0.48 are introduced in this experiment. The working fluid is the hot water in the inner tube and cold water in the annulus, the flow direction is counter-flow. The temperature inlet of hot water is kept constant at 60°C while the flow rate is in the range of Reynolds number 5400 - 17,350. The heat exchanger without insertion (plain tube) and typical twisted tape insert (TT) are examined for comparison. Results indicate that the proposed VTT increases the heat transfer, friction factor, and thermal performance of the heat exchanger. Under the similar condition, VTT provides the best performance in comparison with TT and plain tube. Decreasing width ratio (w/W) increases the heat transfer and thermal performance. However, when the heat transfer is increased, the friction factor is also increasing. The results also revealed that the use of the VTT and TT, the increase in the heat transfer and friction factor up to 97% and 3.48 times of the plain tube. The highest thermal performance is 1.4.

1.
S.
Eiamsa-ard
,
C.
Thianpong
,
P.
Promvonge
,
Int. Commun. Heat Mass Transf.
33
,
509
525
(
2006
).
2.
S.W.
Chang
,
T.L.
Yang
,
J.S.
Liou
,
Exp. Therm. Fluid Sci.
32
,
489
501
(
2007
).
3.
A.
Garcia
,
A.
Viedma
,
Int. J. Heat Mass Transfer
48
,
4640
4651
(
2005
).
4.
M.A.
Akhavan-Behabadi
,
S.G.
Mohseni
,
H.
Najafi
,
H.
Ramazanzadeh
,
Int. Commun. Heat Mass Transf.
36
,
1089
1095
(
2009
).
5.
X.
Zhang
,
Z.
Liu
,
W.
Liu
,
Int. J. Heat Mass Transfer
60
,
490
498
(
2013
).
6.
S.
Rashidi
,
N.M.
Zade
,
J.A.
Esfahani
,
Chem. Eng. Process. Process Intensif.
117
,
27
37
(
2017
).
7.
A.T.
Wijayanta
,
T.
Istanto
,
K.
Kariya
,
A.
Miyara
,
Exp. Therm. Fluid Sci.
87
,
141
148
(
2017
).
8.
Y.
Lei
,
F.
Zheng
,
C.
Song
,
Y.
Lyu
,
Int. J. Heat Mass Transf.
111
,
299
311
(
2017
).
9.
A.W.
Date
,
Int. J. Heat and Mass Transfer
17
,
845
859
(
1974
).
10.
J.P.
Du Plessis
,
D.G.
Kroger
,
Int. J. Heat and Mass Transfer
27
,
2095
2100
(
1984
).
11.
Z.H.
Ayub
and
S,F.
Al-Fahed
,
Int. J. Heat and Fluid Flow
14
,
64
67
(
1993
)
12.
S.K.
Saha
,
A.
Dutta
,
S.K.
Dhal
,
Int. J. Heat and Mass Transfer
44
,
4211
4223
(
2001
).
13.
I.
Yaningsih
,
A.T.
Wijayanta
, “
Concentric tube heat exchanger installed by twisted tape using various wings with alternate axis
,” in
International Conference of Engineering, Science and Nanotechnology-2016
,
AIP Conference Proceedings
1788
, (
AIP Publishing
,
2017
), pp.
030005-1
030005-8
.
14.
S.
Eiamsa-ard
,
P.
Seemawute
,
K.
Wongcharee
,
Exp. Therm. Fluid Sci.
34
,
711
719
(
2010
).
15.
P.
Murugesan
,
K.
Mayilsamy
,
S.
Suresh
,
Chinese Journal of Chemical Engineering
, Vol.
18
,
609
617
(
2010
).
16.
P.
Murugesan
,
K.
Mayilsamy
,
S.
Suresh
,
P.S.S.
Srinivasan
,
Int. Commun. Heat Mass Transf.
38
,
329
334
(
2011
).
17.
M.M.K.
Bhuiya
,
M.S.U.
Chowdhury
,
M.
Saha
,
M.T.
Islam
,
Int. Commun. Heat Mass Transf.
46
,
49
57
(
2013
).
18.
B.
Salam
,
S.
Biswas
,
S.
Saha
,
M. M. K.
Bhuiya
,
Procedia Engineering
, Vol.
56
,
96
103
(
2013
).
19.
P.A.
Sawarkar
,
P.R.
Pachghare
,
International Journal of Science and Research
, Vol.
4
,
1174
1179
(
2015
).
20.
A.
Saravanan
,
J.S.
Shentilkumaar
,
S.
Jaisankar
,
Appl. Therm. Eng.
102
,
476
486
(
2016
).
21.
A.
Saysroy
,
S.
Eiamsa-ard
,
Appl. Therm. Eng.
112
,
895
910
(
2017
).
22.
ANSI/ASME
,
Measurement Uncertainty
, PTC 19, 1-1985, Part I,
1986
.
23.
Y.A.
Chengel
,
Heat and Mass Transfer
, (
Mc Graw-Hill
,
New York
2008
).
24.
F.M.
White
,
Fluid Mechanics
7th edition, (
Mc Graw-Hill
,
New York
2011
).
25.
T.
Istanto
,
D.
Danardono
,
I.
Yaningsih
,
A.T.
Wijayanta
, “
Experimental study of heat transfer enhancement in solar air heater with different angle of attack of V-down continuous ribs
,” in
3rd AUN/SEED-NET Regional Conference on Energy Engineering and the 7th International Conference on Thermofluids-2015
,
AIP Conference Proceedings
1737
, edited by
T.
Biwa
, et al
(
American Institute of Physics Inc.
,
2016
), pp.
060002-1
060002-13
.
26.
I.
Yaningsih
,
T.
Istanto
,
A.T.
Wijayanta
, “
Experimental study of heat transfer enhancement in a concentric double pipe heat exchanger with different axial pitch ratio of perforated twisted tape inserts
,” in
International Conference of Sustainable Energy and Advanced Materials-2015
,
AIP Conference Proceedings
1717
, edited by
A.T.
Wijayanta
, et al
(
AIP Publishing LLC
,
2016
), pp.
030012-1
030012-10
.
27.
I.
Yaningsih
,
A.T.
Wijayanta
, “
Influences of pitch-length louvered strip insert on thermal characteristic in concentric pipe heat exchanger
,” in
1st Sriwijaya International Conference on Engineering, Science, and Technology-2016, MATEC Web of Conferences 101
, edited by
I.
Iskandar
, et al
(
EDP Sciences
,
2017
), pp
1
6
.
28.
P.
Murugesan
,
K.
Mayilsamy
,
S.
Suresh
,
Jordan Journal of Mechanical and Industrial Engineering
, Vol.
5
,
559
565
(
2011
).
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