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TECHNICAL PAPERS

A New Friction Factor Model and Entrance Loss Coefficient for Honeycomb Annular Gas Seals

[+] Author and Article Information
Amro M. Al-Qutub

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia

D. Elrod, Hugh W. Coleman

Propulsion Research Center, Department of Mechanical and Aerospace Engineering, University of Alabama in Huntsville, Huntsville, AL 35807

J. Tribol 122(3), 622-627 (Jul 15, 1999) (6 pages) doi:10.1115/1.555411 History: Received March 04, 1999; Revised July 15, 1999
Copyright © 2000 by ASME
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References

Kleynhans,  G., and Childs,  D., 1997, “The Acoustic Influence of Cell Depth on The Rotordynamic Characteristics of Smooth-Rotor/Honeycomb Stator Annular Gas Seals,” ASME J. Eng. Gas Turbines Power, 119, No. 4, pp. 949–957.
Elrod, D, Nicks, C., Childs, D., and Nelson, C., 1985, “A Comparison of Experimental and Theoretical Results for Rotordynamic Coefficients of Four Annular Gas Seals,” TRC-SEALS-5-85, Turbomachinery Laboratories Report, Texas A&M University, July 1985.
Kleynhans, G. F., 1991, “A Comparison of Experimental Results and Theoretical Prediction of the Rotordynamic and Leakage Characteristics of Short (L/D=1/6) Honeycomb and Smooth annular Pressure Seals,” TRC-SEAL-12-91 #346, Turbomachinery Laboratory Report, Texas A&M University, December 1991.
Nelson,  C. C., 1984, “Analysis for Leakage and Rotordynamic Coefficients of Surface-Roughened Tapered Annular Gas Seals,” ASME J. Tribol., 106, pp. 927–934.
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Deissler, R. G., 1953, “Analysis of Turbulent Heat Transfer and Flow in The Entrance Regions of Smooth Passages,” NACA TN 3016.
Elrod,  D., Childs,  D., and Nelson,  C., 1990, “An Annular Gas Seal Analysis Using Empirical Entrance and Exit Region Friction Factors,” ASME J. Tribol., 112, No. 2, pp. 245–258.
Ha,  T. W., and Childs,  D. W., 1994, “Annular Honeycomb-Stator Turbulent Gas Seals Analysis Using a New Friction Factor Model Based on Flat Plate Tests,” ASME J. Tribol., 116, pp. 352–360.
Shapiro, A. H. and Smith, R. D., 1948, “Friction Coefficients in the Inlet Length of Smooth, Rounded Tubes,” NACA Technical Note No. 1785.
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Ha,  T. W., Morrison,  G. L., and Childs,  D. W., 1992, “Friction Factor Characteristics for Narrow Channels with Honeycomb Surfaces,” ASME J. Tribol., 114, pp. 714–721.
Ha,  T. W., and Childs,  D. W., 1992, “Friction Factor Data for Flat-Plate Tests of Smooth and Honeycomb Surface,” ASME J. Tribol., 114, pp. 772–730.
DeOtte, R., Morrison, G. L., Nava, A., and Hess, J. C., 1994, “A study of Friction Factor in Channel Flow Between Plates with Highly Roughened Surfaces,” Fluid Machinery Forum, ASME Summer Meeting, Lake Tahoe, NV, 19–23 Jun.
Kays, W. M., 1950, “Loss Coefficient for Abrupt Changes in Flow Cross Section with Low Reynolds Number Flow in Single and Multiple-Tube Systems,” ASME Trans., pp. 1067–1074.
Benedict, R. P., Carlucci, N. A., and Swetz, S. D., 1966, “Flow Losses in Abrupt Enlargements and Contractions,” ASME J. Eng. Power, pp. 73–81.
Coleman, H. W., and Steele, W. G., 1989, “Experimentation and Uncertainty Analysis for Engineers,” Wiley, New York, NY.
Brown, K. K. 1996, “Assessment of the Experimental Uncertainty Associated with Regressions,” Ph.D. dissertation, Department of Mechanical and Aerospace Engineering, University of Alabama in Huntsville.

Figures

Grahic Jump Location
Isometric view of the honeycomb seal
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Static seal test section
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Mach number curve fit for S23 at Re=24,700
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The smooth surface friction factor model
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Clearance effect on the honeycomb surface friction factor, L=30 mm, Re=17,100
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The honeycomb surface friction factor results normalized by the new model, Eq. (11)

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