The problem of cross-flow forced convection heat transfer from a horizontal cylinder with multiple, equally spaced, high conductivity permeable fins on its outer surface was investigated numerically. The heat transfer characteristics of a cylinder with permeable versus solid fins were studied for several combinations of number of fins and fin height over the range of Reynolds number (5–200). Permeable fins provided much higher heat transfer rates compared to the more traditional solid fins for a similar cylinder configuration. The ratio between the permeable to solid Nusselt numbers increased with Reynolds number and fin height but tended to decrease with number of fins. This ratio was as high as 4.35 at Reynolds number of 150 and a single fin with a nondimensional height of 3.0. The use of 1–2 permeable fins resulted in much higher Nusselt number values than when using up to 18 solid fins. Such an arrangement has other benefits such as a considerable reduction in weight and cost.

Issue Section:
Forced Convection
Keywords:
forced convection, external flows, flow through porous media, Computational, Enhancement, Finned Surfaces, Forced Convection, Heat Transfer, Porous Media
Topics:
Cylinders, Fins, Forced convection, Heat transfer, Reynolds number, Porous materials
1.
Vafai
,
K.
, and
Huang
,
P. C.
,
1994
, “
Analysis of Heat Transfer Regulation and Modification Employing Intermittently Emplaced Porous Cavities
,”
ASME J. Heat Transfer
,
116
, pp.
604
–
613
.
2.
Al-Nimr
,
M. A.
, and
Alkam
,
M. K.
,
1998
, “
A Modified Tubeless Solar Collector Partially Filled With Porous Substrate
,”
Renewable Energy
,
13
, pp.
165
–
173
.
3.
A/K Abu-Hijleh
,
B.
,
2001
, “
Natural Convection Heat Transfer From a Cylinder Covered With an Orthotropic Porous Layer
,”
Numer. Heat Transfer
,
40
, pp.
767
–
782
.
4.
Badr
,
H. M.
,
1983
, “
A Theoretical Study of Laminar Mixed Convection From a Horizontal Cylinder in a Cross Stream
,”
Int. J. Heat Mass Transfer
,
26
, pp.
639
–
653
.
5.
Saitoh
,
T.
,
Sajik
,
T.
, and
Maruhara
,
K.
,
1993
, “
Benchmark Solutions to Natural Convection Heat Transfer Problem Around a Horizontal Circular Cylinder
,”
Int. J. Heat Mass Transfer
,
36
, pp.
1251
–
1259
.
6.
Ahmad
,
R. A.
,
1996
, “
Steady-State Numerical Solution of the Navier-Stokes and Energy Equations Around a Horizontal Cylinder at Moderate Reynolds Numbers From 100 to 500
,”
Heat Transfer Eng.
,
17
, pp.
31
–
81
.
7.
A/K Abu-Hijleh
,
B.
,
1999
, “
Laminar Mixed Convection Correlations for an Isothermal Cylinder in Cross Flow at Different Angles of Attack
,”
Int. J. Heat Mass Transfer
,
42
, pp.
1383
–
1388
.
8.
A/K Abu-Hijleh
,
B.
,
2003
, “
Numerical Simulation of Forced Convection Heat Transfer From a Cylinder With High Conductivity Radial Fins in Cross-Flow
,”
Int J. Therm. Sci.
,
42
(
8
), pp.
741
–
748
.
9.
Stewart
,
W. E.
, and
Burns
,
A. S.
,
1992
, “
Convection in a Concentric Annulus With Heat Generating Porous Media and a Permeable Inner Boundary
,”
Int. Commun. Heat Mass Transfer
,
19
, pp.
859
–
868
.
10.
Zhao
,
T. S.
, and
Liao
,
Q.
,
2000
, “
On Capillary-Driven Flow and Phase-Change Heat Transfer in a Porous Structure Heated by a Finned Surface: Measurements and Modeling
,”
Int. J. Heat Mass Transfer
,
43
, pp.
1141
–
1155
.
11.
Zhao
,
T. S.
, and
Song
,
Y. J.
,
2001
, “
Forced Convection in a Porous Medium Heated by a Permeable Wall Perpendicular to Flow Direction: Analyses and Measurements
,”
Int. J. Heat Mass Transfer
,
44
, pp.
1031
–
1037
.
12.
A/K Abu-Hijleh
,
B.
,
2002
, “
Natural Convection Heat Transfer From a Cylinder With High Conductivity Permeable Fins
,”
ASME J. Heat Transfer
,
125
(
2
), pp.
282
–
288
.
13.
Anderson, J. D., 1994, Computational Fluid Dynamics: The Basics With Applications, McGraw Hill, New York.
14.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw Hill, New York.
15.
Incropera, F. P., and DeWitt, D. P., 1996, Fundamentals of Heat and Mass Transfer, John Wiley & Sons, New York.
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