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Heat Transfer Augmentation in Gas-Cooled Channels

ISBN:
0-8493-9915-7 (印刷)

Heat Transfer Augmentation in Gas-Cooled Channels

Jurgis Vilemas
Lithuanian Energy Institute, 3 Breslaujos str., LT-44403 Kaunas-35, Lithuania

Vytautas Simonis
Lithuanian Energy Institute, Branduolinës inzinerijos problemø laboratorija, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

J. E. Adomaitis
Lithuanian Energy Institute, Lithuania

説明

This book is concerned with relationships governing high-rate, enhanced turbulent heat transfer in gas-cooled channels. The book presents results of detailed measurements of fluid-dynamic and thermal parameters on smooth and rough heat-emitting cylinders in axial flow, and heat-transfer and hydraulic-drag coefficients in rough annular and helical channels and in bundles of twisted tubes in axial flow. All the results are correlated in general form, which is suitable for practical application over a wide range of operating and geometric parameters.



253 pages, © 1994

目次:

Preface
Nomenclature
1. Introduction
2. Experimental and Analytical Procedures
2.1. Experimental Facilities and Test Sections
2.2. Technique of Investigating the Fields of Velocity, Fluctuations of Velocity, and Temperature, Friction, and Heat Transfer on Cylinders in Axial Flow
2.3. Technique Used in Working up of Data on Heat Transfer and Hydraulic Drag in Rough Annular and Helical Channels
2.4. Techniques Used in Calculating and Analyzing the Velocity and Temperature Distributions on a Cylinder in Axial Flow and of Heat Transfer in Rough Annular Channels
2.5. Technique for Transforming Data in Heat Transfer and Drag in Annular Channels to Bundles of Tubes in Longitudinal Flow
2.6. Procedure for Determining the Heat-Transfer and Hydraulic-Drag Coefficients in Bundles of Twisted Tubes: Governing Criteria
2.7. Technique Employed in Investigating the Structure of Flow in Bundles of Twisted Tubes
3. Heat Transfer and Friction of a Smooth and a Rough Cylinder in Axial Flow
3.1. Velocity and Temperature Distributions in the Boundary Layer
3.2. Heat-Transfer Coefficients
3.3. Local Friction Factors
3.4. Predicted Values and Their Comparison with Measurements
4. Heat Transfer and Hydraulic Drag of Rough Annular and Helical Channels
4.1. Heat Transfer at Constant Physical Properties of the Gas
4.2. Effect of Variability of the Physical Properties of the Gas on Heat Transfer
4.3. Hydraulic Drag
4.4. Predicted Values of Heat-Transfer Coefficients in Rough Annular Channels
4.5. Conversion of Experimental Results
4.6. Enhancement of Heat Transfer in Helical Channels
4.7. Effectiveness of Heat-Transfer Enhancement
5. Heat Transfer and Hydraulic Drag of Bundles of Twisted Tubes
5.1. Typical Distributions of Surface-Temperature and Heat-Transfer Coefficients along and over the Perimeter of a Twisted Tube within a Bundle
5.2. Patterns in the Distribution of Heat-Transfer Coefficients in Bundles of Twisted Tubes
5.3. Hydraulic Drag in Bundles of Twisted Tubes
6. Structure of Flow in Bundles of Twisted Tubes
6.1. Distributions of Velocity in the Space Between Tubes within Bundles and about a Single Twisted Tube
6.2. Distribution of Static Pressure over the Perimeter of a Twisted Tube
6.3. Results of Investigation of Turbulence Parameters
6.4. Relationship Between the Flow Structure and Coefficients of Heat Transfer in Bundles of Twisted Tubes: Physical Model of Flow
7. Conclusion
References
Appendices
INDEX