Offset strip-fin heat exchangers have numerous applications throughout various industries because they can provide a large amount of heat transfer area in a small volume. The widespread use of the offset strip-fin design has ensured that there are numerous dimensional variations and shown that changes in dimensional parameters affect performance. It is then important to understand how the geometry of an offset strip-fin heat exchanger can affect its performance. Therefore, an investigation into the parametric effects on the global performance of an innovative high-temperature offset strip-fin heat exchanger was numerically performed in this study, where the numerical solution was obtained through a finite-volume method. Computations were carried out for each of the heat exchanger’s geometrical parameters: fin thickness (t), fin length (l), channel height (H), spanwise pitch (px), and the newly introduced gap parameter (g). Also, the effects of rounding the fins leading and trailing edges were investigated, while the heat exchanger’s volume, mass flow rates, and inlet temperatures were kept constant. The results are presented in the form of pressure drops and heat transfer rates, and the coefficient of performance parameter shows that fins with rounded leading and trailing edges outperform fins with rectangular edges.

1.
Shah
,
R. K.
, and
Webb
,
R. L.
, 1983, “
Compact and Enhanced Heat Exchangers
,”
Heat Exchangers: Theory and Practice
,
Taborek
J.
,
Hewitt
G. F.
, and
Afgan
N.
, eds.,
Hemisphere
,
Washington, DC
, pp.
440
444
.
2.
Webb
,
R. L.
, 1987, “
Enhancement of Single-Phase Heat Transfer
,”
Handbook of Single-Phase Convective Heat Transfer
,
Kakac
,
S.
,
Shah
,
R. K.
, and
Aung
,
W.
, eds.,
Wiley
,
New York
, pp.
8
10
.
3.
Kays
,
W. M.
, and
Crawford
,
M. E.
, 1993,
Convective Heat and Mass Transfer
,
3rd ed.
,
McGraw-Hill
,
New York
, pp.
451
458
.
4.
Webb
,
R. L.
, 1994,
Principles of Enhanced Heat Transfer
,
Wiley
,
New York
, pp.
89
98
.
5.
Norris
,
R. H.
, and
Spofford
,
W. A.
, 1942, “
High-Performance Fins for Heat Transfer
,”
Trans. ASME
0097-6822,
64
, pp.
489
496
.
6.
Kays
,
W. M.
, 1960, “
The Basic Heat Transfer and Flow Friction Characteristics of Six Compact High-Performance Heat Transfer Surfaces
,”
Trans. ASME: J. Eng. Gas Turbines Power
0742-4795,
82
, pp.
27
34
.
7.
Briggs
,
D. C.
, and
London
,
A. L.
, 1961, “
The Heat Transfer and Flow Friction Characteristics of Five Offset Rectangular and Six Plain Triangular Plate-Fin Heat Transfer Surfaces
,”
International Developments Heat Transfer: Proceedings of the Second International Heat Transfer Conference
, Boulder, CO,
ASME
,
New York
, pp.
122
134
.
8.
Sparrow
,
E. M.
, and
Hajiloo
,
A.
, 1980, “
Measurements of Heat Transfer and Pressure Drop for an Array of Staggered Plates Aligned Parallel to an Air Flow
,”
J. Heat Transfer
0022-1481,
102
, pp.
426
432
.
9.
Dubrovsky
,
E. V.
, and
Vasiliev
,
V. Ya.
, 1988, “
Enhancement of Convective Heat Transfer in Rectangular Ducts of Interrupted Surfaces
,”
Int. J. Heat Mass Transfer
0017-9310,
31
, pp.
807
818
.
10.
Dejong
,
N. C.
, and
Jacobi
,
A. M.
, 1997, “
An Experimental Study of Flow and Heat Transfer in Parallel-Plate Arrays: Local, Row-by-Row and Surface Average Behavior
,”
Int. J. Heat Mass Transfer
0017-9310,
40
, pp.
1365
1378
.
11.
Mullisen
,
R. S.
, and
Loehrke
,
R. I.
, 1986, “
A Study of the Flow Mechanisms Responsible for Heat Transfer Enhancement in Interrupted-Plate Heat Exchangers
,”
J. Heat Transfer
0022-1481,
108
, pp.
377
385
.
12.
Suzuki
,
K.
,
Hirai
,
E.
,
Miyake
,
T.
, and
Sato
,
T.
, 1985, “
Numerical and Experimental Studies on a Two-Dimensional Model of an Offset-Strip-Fin Type Compact Heat Exchanger Used at Low Reynolds Number
,”
Int. J. Heat Mass Transfer
0017-9310,
28
, pp.
823
835
.
13.
Xi
,
G.
,
Hagiwara
,
Y.
, and
Suzuki
,
K.
, 1992, “
Effect of Fin Thickness on Flow and Heat-Transfer Characteristics of Fin Arrays: An Offset-Fin Array in the Low Reynolds Number Range
,”
Heat Transfer-Jpn. Res.
0096-0802,
21
, pp.
1
19
.
14.
Shah
,
R. K.
,
Heikal
,
M. R.
,
Thonon
,
B.
, and
Tochon
,
P.
, 2000, “
Progress in the Numerical Analysis of Compact Heat Exchanger Surfaces
,”
Adv. Heat Transfer
0065-2717,
34
, pp.
363
442
.
15.
Sparrow
,
E. M.
,
Abraham
,
J. P.
, and
Chevalier
,
P. W.
, 2005, “
A DOS-Enhanced Numerical Simulation of Heat Transfer and Fluid Through an Array of Offset Fins With Conjugate Heating in the Bounding Solid
,”
J. Heat Transfer
0022-1481,
127
, pp.
27
33
.
16.
Wieting
,
A. R.
, 1975, “
Empirical Correlations for Heat Transfer and Flow Friction Characteristics of Rectangular Offset-Fin Plate-Fin Heat Exchangers
,”
ASME J. Heat Transfer
0022-1481,
97
, pp.
488
490
.
17.
Joshi
,
H. M.
, and
Webb
,
R. L.
, 1987, “
Heat Transfer and Friction in the Offset Strip-Fin Heat Exchanger
,”
Int. J. Heat Mass Transfer
0017-9310,
30
, pp.
69
83
.
18.
Kelkar
,
K. M.
, and
Patankar
,
S. V.
, 1989, “
Numerical Prediction of Heat Transfer and Fluid Flow in Rectangular Offset-Fin Arrays
,”
Numer. Heat Transfer, Part A
1040-7782,
15
, pp.
149
164
.
19.
Manglik
,
R. M.
, and
Bergles
,
A. E.
, 1995, “
Heat Transfer and Pressure Drop Correlations for the Rectangular Offset Strip Fin Compact Heat Exchanger
,”
Exp. Therm. Fluid Sci.
0894-1777,
10
, pp.
171
180
.
20.
Subramanian
,
S.
,
Ponyavin
,
V.
,
De Losier
,
C. R.
,
Chen
,
Y.
, and
Hechanova
,
A. E.
, 2005, “
Design Considerations for Compact Ceramic Offset Strip-Fin High Temperature Heat Exchangers
,”
Proceedings of the International Conference on Enhanced, Compact, and Ultra-Compact Heat Exchangers: Science, Engineering and Technology
,
Whistler
,
Canada
, CHE2005–14, pp.
103
110
.
21.
Fluent Inc.
, 2003, Fluent 6.2 User’s Guide, Lebanon, NH.
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