This paper is the first of two papers that present the results of a comprehensive study of heat transfer and pressure drop in annuli with spirally fluted inner tubes for the laminar, transition, and turbulent flow regimes. To understand the underlying physical phenomena responsible for heat transfer enhancement, flow mechanisms documented elsewhere are combined with pressure drop measurements to propose friction factor correlations for the low Re range (Re < 800) and the high Re range (800 < Re < 43,500). Friction factors were found to be functions of the flute depth, pitch and angle, and the annulus radius ratio. These correlations are used in the second paper to develop Nusselt number correlations in terms of the fluted annulus friction factor. Transition in these annuli occurred in the 310 < Re < 1000 range. In Part II of this study, this early transition is shown to be responsible, in part, for significant heat transfer enhancement. Friction factor increases were typically between 1.1 and 2.0 in the laminar regime, and up to 10 in the turbulent regime. These enhancement values can be used in conjunction with heat transfer enhancement values reported in Part II to determine appropriate ranges of applicability for spirally enhanced annuli.

Issue Section:
Forced Convection
Keywords:
Augmentation and Enhancement, Flow Visualization, Forced Convection
Topics:
Annulus, Heat transfer, Hydrodynamics, Pressure drop, Friction, Turbulence, Flow (Dynamics), Flow visualization, Forced convection
1.
Bergles, A. E., 1980, Heat Transfer Characteristics of Turbotec Tubing, Heat Transfer Laboratory Report HTL-24 ISU-ERI-Ames-81018, Iowa State University, Ames, IA.
2.
Garimella, S., Chandrachood, V., Christensen, R. N., and Richards, D. E., 1988, “Investigation of Heat Transfer and Pressure Drop Augmentation for Turbulent Flow in Spirally Enhanced Tubes,” ASHRAE Transactions, Vol. 94, Part 2.
3.
Garimella, S., 1990, “Experimental Investigation of Heat Transfer and Pressure Drop Characteristics of Annuli With Spirally Fluted Inner Tubes,” Ph.D. Dissertation, The Ohio State University, Columbus, OH.
4.
Garimella
S.
, and
Christensen
R. N.
,
1995
, “
Heat Transfer and Pressure Drop Characteristics of Spirally Fluted Annuli: Part II—Heat Transfer
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
117
, this issue, pp.
61
–
68
.
5.
Kakac, S., Shah, R. K., and Aung, W., 1987, Handbook of Single-Phase Convective Heat Transfer, Wiley, New York, pp. 3–92, 4–132.
6.
Kline
S. J.
, and
McClintock
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
Mechanical Engineering
, Vol.
75
, Jan., pp.
3
–
8
.
7.
Marto, P. J., Reilly, R. J., and Fenner, J. H., 1979, “An Experimental Comparison of Enhanced Heat Transfer Condenser Tubing,” in: Advances in Enhanced Heat Transfer, ASME, New York, pp. 1–9.
8.
Nakayama, W., Takahashi, K., and Daikoku, T., 1983, “Spiral Ribbing to Enhance Single-Phase Heat Transfer Inside Tubes,” ASME–JSME Thermal Engineering Joint Conference Proceedings, Honolulu, HI, Vol. 1, pp. 365–372.
9.
Natarajan
N. M.
, and
Lakshmanan
S. M.
,
1973
, “
Laminar Flow Through Annuli: Analytical Method for Calculation of Pressure Drop
,”
Indian Chem. Eng.
, Vol.
15
, pp.
50
–
53
.
10.
Ravigururajan
T. S.
, and
Bergles
A. E.
,
1985
, “
General Correlations for Pressure Drop and Heat Transfer for Single-Phase Turbulent Flow in Internally Ribbed Tubes
,” in:
Augmentation of Heat Transfer in Energy Systems
, ASME HTD-Vol.
52
, pp.
9
–
20
.
11.
Richards, D. E., Grant, M., and Christensen, R. N., 1987, “Turbulent Flow and Heat Transfer Inside Doubly-Fluted Tubes,” ASHRAE Transactions, Vol. 93, Pt. 2.
12.
Techo
R.
,
Tickner
R. R.
, and
James
R. E.
,
1965
, “
An Accurate Equation for the Computation of the Friction Factor for Smooth Pipes From the Reynolds-Number
,”
J. Appl. Mech.
, Vol.
32
, p.
443
443
.
13.
Walker
J. E.
,
Whan
G. A.
, and
Rothfus
R. R.
,
1957
, “
Fluid Friction in Non-circular Ducts
,”
AIChE Journal
, Vol.
3
, No.
4
, pp.
484
–
489
.
14.
Watkinson
A. P.
,
Miletti
D. L.
, and
Tarassoff
P.
,
1973
, “
Turbulent Heat Transfer and Pressure Drop in Internally Finned Tubes
,”
AIChE Symposium Series
, Vol.
69
, No.
131
, pp.
94
–
103
.
15.
Watkinson, A. P., Miletti, D. L., and Kubanek, G. R., 1975a, “Heat Transfer and Pressure Drop of Forge-Fin Tubes in Turbulent Air Flow,” Proceedings of the ASHRAE Semi-Annual Meeting, ASHRAE, New York, Vol. 81, Part l, pp. 330–349.
16.
Watkinson, A. P., Miletti, D. L., and Kubanek, G. R., 1975b, “Heat Transfer and Pressure Drop of Internally Finned Tubes in Laminar Oil Flow,” Proceedings of the AIChE-ASME Heat Transfer Conference, ASME, New York, Paper No. 75-HT-41.
17.
Webb
R. L.
,
Eckert
E. R. G.
, and
Goldstein
R. J.
,
1971
, “
Heat Transfer and Friction in Tubes With Repeated-Rib Roughness
,”
Int. J. Heat Mass Transfer
, Vol.
14
, pp.
601
–
617
.
18.
Withers
J. G.
,
1980
a, “
Tube-Side Heat Transfer and Pressure Drop for Tubes Having Helical Internal Ridging With Turbulent/Transitional Flow of Single-Phase Fluid. Part 1. Single-Helix Ridging
,”
Heat Transfer Engineering
, Vol.
2
, No.
1
, pp.
48
–
58
.
19.
Withers
J. G.
,
1980
b, “
Tube-Side Heat Transfer and Pressure Drop for Tubes Having Helical Internal Ridging With Turbulent/Transitional Flow of Single-Phase Fluid. Part 2. Multiple-Helix Ridging
,”
Heat Transfer Engineering
, Vol.
2
, No.
2
, pp.
43
–
50
.
This content is only available via PDF.
Copyright © 1995
 by The American Society of Mechanical Engineers
You do not currently have access to this content.