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Vibrations of Tubes in Heat Exchangers

1-56700-077-0 (Print)

Vibrations of Tubes in Heat Exchangers

Algirdas Zukauskas
Lithuanian Academy of Sciences, Vilnius, Lithuania

Vladislavas Katinas
Lithuanian Energy Institute, Atsinaujinanciø energijos saltiniø laboratorija, Breslaujos str. 3, LT-44403 Kuanas, Lithuania


This volume is concerned with tube vibrations in heat exchangers. It treats the causes of vibrations, the possibilities of allowing for them in the design stage, and recommends ways of suppressing them to acceptable levels. It presents clearly a large body of information on unsteady hydrodynamic processes and the forces acting on the elements of the structures.
The recently accumulated data on flow-induced tube vibrations enjoy wide application and are of interest to designers of heat exchangers, as well as for researchers dealing with the problems of fluid dynamics and heat transfer in power plants. The Institute set out to compile and revise material on tube vibrations from various sources, and to complete it with the latest data and scientific advances.

219 pages, © 1997


1 Introduction
1.1 General Information
1.2 In-Frame Arrangement of Tube Heat Exchangers
1.3 Regularities of the Tube Arrangement in Heat-Transfer Assemblies
1.4 The Flow of Working Fluids in Heat Exchangers
1.5 Main Trends of the Studies of Tube Vibrations in Detached Flow
1.6 Evaluation of the Dynamic Action of a Detached Flow on Tubes
1.7 Evaluation of the Vibrational Damages of Tube Arrays and Requirements to their Material
2 Facilities and Methods for Modeling Fluid Dynamics and Vibrations of the Heat Exchanger Tube Arrays in a Flow
2.1 Numerical Modeling of the Fluid-Dynamic Processes in a Detached Flow Past Tubes
2.2 Facilities of the Experimental Modeling
2.3 Mathematical Processing of the Results
3 Force Action of a Cross Flow on Smooth Tube Bundles
3.1 Flow Pressure Fluctuations on the Tube Surface
3.2 Structure of Vortex Shedding from Tube Bundles
3.3 Three-Dimensional Flow Structure on the Tube Surface
3.4 Nonstationary Fluid-Dynamic Forces Acting on the Tubes
3.5 Values of the Coefficients cyand cx in Tube Bundles
3.6 Interrelationship between the Fluid-Dynamic Forces Acting on Vibrating Tubes and the Vibration Parameters
4 Prediction of Tube Vibrations in Detached Flow
4.1 Mathematical Model for Predicting Tube Vibrations
4.2 Prediction of the Natural Frequencies of Tube Vibrations
4.3 Prediction of the Reduced Quantities of Tube Vibrations
4.4 Prediction of Vibrations of Tubes or Rods Excited by Turbulent Pulsations of the Flow Pressure
4.5 Prediction of Tube Vibrations Induced by the Vortex Shedding
4.6 Prediction of Fluid-Elastic Vibrations in Tube Bundles
4.7 Prediction of Acoustic Resonance
5 Vibrations of Finned and Plane-Oval Hibe Bundles in Cross Flow
5.1 Unsteady Fluid-Dynamic Processes in Finned Tube Bundles
5.2 Vibrations of the Flow-Excited Bundles of Finned Tubes
5.3 Effect of the External Flow Turbulence on a Flow Past the Bundles of Finned Tubes and on their Vibrations
5.4 Flow Past the Bundles of Plane-Oval Tubes and their Vibrations
6 Specific Features of Vibrations in the Tube Banks and Units of Heat Exchangers
6.1 Vibrations of Tubes in a Cross Flow
6.2 The Effect of the External Flow Turbulence on Vibrations of Tube B undies Excited by the Flow
6.3 Fluid-dynamic Characteristics of Tubes Placed Asymmetrically in Transverse Rows
6.4 Effect of the Channel Wall on the Flow Past Tubes
6.5 Vibrations of Two Tubes Placed in Series in the Flows of Heat-Transfer Agents
6.6 Vibrations of Tube Bundles in an Asymmetric Flow
6.7 Flow over and Vibrations of Inclined Tube Bundles in the Streams of Heat-Transfer Agents
6.8 Flow Past Radial Tube Bundles and Their Vibrations
6.9 Vibrations of Heat-Transfer Structures of the Heat Exchangers with Radially Positioned Tubes
6.10 Tube Vibrations in the Inlet and Outlet Zones of a Heat-Transfer Agent in Heat Exchangers
6.11 Vibrations of Tubes in Heat Exchangers
7 Indications on Prediction and Obviation of the Tube Vibrations in a Heat Exchange Equipment
7.1 Fundamental Principles of Predicting the Flow-Induced Tube Vibrations
7.2 Means of Averting Vibrations of the Flow-Excited Tubes in Heat Eexchangers
7.3 Technological Recommendations for Increasing Vibration Stability of the Tube Systems of Heat Exchangers