Abstract

Decaying swirl flow can enhance the heat transfer inside a tube. For the decaying swirl flow of which maximum tangential velocity is located in the immediate vicinity of the wall, an analytical model based on the fluid theorem about the moment of momentum is proposed for the local maximum tangential velocity, local friction factor, and local Nusselt number in this paper. The analytical solutions compare favorably with the experimental data. Influences of the Reynolds number, wall roughness and initial tangential-to-axial velocity ratio on the decaying characteristics of the friction factor and Nusselt number have been analyzed. The analytical results show that the swirl flow decays more rapidly at the initial segment; for same conditions, the friction factor decays more severely than the Nusselt number; relative to the values of the nonswirl flow, the friction factor increases more intensely than the Nusselt number. [S0022-1481(00)70401-4]

Issue Section:
Technical Notes
Keywords:
swirling flow, heat transfer, confined flow, Analytical, Enhancement, Flow, Heat Transfer, Swirling
Topics:
Flow (Dynamics), Friction, Heat transfer
1.
Kreith
,
F.
, and
Margolis
,
D.
,
1959
, “
Heat Transfer and Friction in Turbulent Vortex Flow
,”
Appl. Sci. Res.
,
8
, pp.
457
–
473
.
2.
Smithberg
,
E.
, and
Landis
,
F.
,
1964
, “
Friction and Forced Convection Heat Transfer Characteristics in Tubes With Twisted Tape Swirl Generator
,”
ASME J. Heat Transfer
,
86
, pp.
39
–
49
.
3.
Hay
,
N.
, and
West
,
P. D.
,
1975
, “
Heat Transfer in Free Swirling Flow in a Pipe
,”
ASME J. Heat Transfer
,
97
, pp.
411
–
416
.
4.
Guo
,
Z.
, and
Dhir
,
V. K.
,
1989
, “
Single- and Two-Phase Heat Transfer in Tangential Injection-Induced Swirl Flow
,”
Int. J. Heat Fluid Flow
,
10
, pp.
203
–
210
.
5.
Manglik
,
R. M.
,
Bergles
,
A. E.
, and
Manglik
,
R. M.
,
1993
, “
Heat Transfer and Pressure Drop Correlations for Twisted-Tape Inserts in Isothermal Tubes: Part II—Transition and Turbulent Flows
,”
ASME J. Heat Transfer
,
115
, pp.
890
–
896
.
6.
Chang
,
F.
, and
Dhir
,
V. K.
,
1995
, “
Mechanisms of Heat Transfer Enhancement and Slow Decay of Swirl in Tubes Using Tangential Injection
,”
Int. J. Heat Fluid Flow
,
16
, pp.
78
–
87
.
7.
Yajnik
,
K. S.
, and
Subbaiah
,
M. V.
,
1973
, “
Experiments on Swirling Turbulent Flows Part 1. Similarity in Swirling Flows
,”
J. Fluid Mech.
,
60
, pp.
665
–
687
.
8.
Kitoh
,
O.
,
1991
, “
Experimental Study of Turbulent Swirling Flow in a Straight Pipe
,”
J. Fluid Mech.
,
225
, pp.
445
–
479
.
9.
Narezhny
,
E. G.
, and
Sudarev
,
A. V.
,
1972
, “
Local Heat Transfer in Air Flowing in Tubes with a Turbulence Promoter at the Inlet
,”
Heat Transfer-Sov. Res.
,
4
, pp.
62
–
66
.
10.
Algifer
,
A. H.
,
Bhardwaj
,
R. K.
, and
Rao
,
Y. V. N.
,
1988
, “
Heat Transfer in Turbulent Decaying Swirl Flow in a Circular Pipe
,”
Int. J. Heat Mass Transf.
,
31
, pp.
1563
–
1568
.
11.
Shen, Y. P., 1988, “Study on the Heat Transfer Enhancement by Axial Vane Swirlers,” M.S. thesis, Southeast University, China.
12.
Migay
,
V. K.
, and
Golubev
,
L. K.
,
1970
, “
Friction and Heat Transfer in Turbulent Swirl Flow with a Variable Swirl Generator in a Pipe
,”
Heat Transfer-Sov. Res.
,
2
, pp.
68
–
73
.
13.
Wu, H. Y., 1997, “Study on the Decaying Swirl Flow and its Compound Enhanced Heat Transfer in Tubes,” Doctoral dissertation, Southeast University, China.
14.
Yermolin
,
V. K.
,
1979
, “
The Effect of Local Flow Swirl on Heat Transfer in the Initial Section of a Cylindrical Pipe
,”
Heat Transfer-Sov. Res.
,
11
, pp.
71
–
76
.
Copyright © 2000
 by ASME
You do not currently have access to this content.