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Glass-Ceramic Hexagonal and Circular Passage Surfaces - Heat Transfer and Flow Friction Design Characteristics
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English
Abstract
Heat transfer and flow friction design characteristics are presented for some “second-generation” glass-ceramic heat exchanger surfaces. These surfaces are of interest in their application as the matrix for the rotary regenerator of the vehicular gas turbine engine.
The paper gives the results for four test matrices, with 550-1650 ft2/ft3 area densities. Two matrices had hexagonal cross-sectional passages and two had circular passages. Test results, derived by the single-blow transient technique, are compared with predictions from laminar flow conduction theory. Flow Reynolds numbers are in the range 80 < Re < 1000.
These surfaces have some advantages over the currently employed triangular passage geometry. The significance of these advantages in terms of the regenerator thermal performance and envelope geometry is discussed.
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London, A. and Shah, R., "Glass-Ceramic Hexagonal and Circular Passage Surfaces - Heat Transfer and Flow Friction Design Characteristics," SAE Technical Paper 730100, 1973, https://doi.org/10.4271/730100.Also In
References
- London A. L. Young M. B. O. Stang J. H. “Glass-Ceramic Surfaces, Straight Triangular Passages-Heat Transfer and Flow Friction Characteristics.” Trans. ASME, Jrl Engrg Power 92 1970 381 389 Department of Mechanical Engineering, Stanford University Stanford, Calif. September 1968
- Cadwell R. G. Chapman W. I. Walch H. C. “The Ford Turbine-An Engine Designed to Compete with the Diesel.” Paper 720168 SAE Automotive Engineering Congress Detroit January 1972
- Shah R. K. London A. L. “Laminar Flow Forced Convection Heat Transfer and Flow Friction in Straight and Curved Ducts-A Summary of Analytical Solutions.” Department of Mechanical Engineering, Stanford University Stanford, Calif. November 1971
- Pucci P. F. Howard C. P. Piersall, C. H. Jr. “The Single-Blow Transient Testing Technique for Compact Heat Exchanger Surfaces.” Trans. ASME, Jrl Engrg Power 89 1967 29 40
- Wheeler A. J. “Single-Blow Transient Testing of Matrix-Type Heat Exchanger Surfaces at Low Values of N tu .” Department of Mechanical Engineering, Stanford University Stanford, Calif. May 1968
- Kays W. M. London A. L. “Compact Heat Exchangers,” 2nd New York McGraw-Hill 1964
- Shah R. K. London A. L. “Influence of Brazing on Very Compact Heat Exchanger Surfaces.” Department of Mechanical Engineering, Stanford University Stanford, Calif. November 1970
- London A. L. “Laminar Flow Gas Turbine Regenerators-The Influence of Manufacturing Tolerances.” Trans. ASME, Jrl Engrg Power 92 1970 46 56