scholarly journals Dynamic characteristics of heat exchanger tubes vibrating in a tube support plate inactive mode

1984 ◽  
Author(s):  
J.A. Jendrzejczyk
Keyword(s):  
Heat Exchanger ◽  
Dynamic Characteristics ◽  
Support Plate ◽  
Inactive Mode

scholarly journals Dynamic Characteristics of Heat Exchanger Tubes Vibrating in a Tube Support Plate Inactive Mode

1986 ◽  
Vol 108 (3) ◽  
pp. 256-266 ◽  
Author(s):  
J. A. Jendrzejczyk
Keyword(s):  
Experimental Study ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Damping Ratio ◽  
Steam Generators ◽  
Support Plate ◽  
Interaction Dynamics ◽  
Fabrication Tolerances ◽  
Shell And Tube ◽  
Inactive Mode

Tubes in shell-and-tube heat exchangers, including nuclear plant steam generators, derive their support from longitudinally positioned tube support plates (TSPs). Typically, there is a clearance between the tube and TSP hole. Depending on design and fabrication tolerances, the tube may or may not contact all of the TSPs. Non-contact results in an inactive TSP which can lead to detrimental flow-induced tube vibrations under certain conditions dependent on the resulting tube-TSP interaction dynamics and the fluid excitation forces. The purpose of this study is to investigate the tube-TSP interaction dynamics. Results of an experimental study of damping and natural frequency as functions of tube-TSP diametral clearance and TSP thickness are reported. Calculated values of damping ratio and frequency of a tube vibrating within an inactive TSP are also presented together with a comparison of calculated and experimental quantities.

scholarly journals Development of New Heat Supply Unit Using Latent Heat (Dynamic Characteristics of Heat Storage Unit by a Use of Plate Fin Type Heat Exchanger)

2005 ◽  
Vol 71 (704) ◽  
pp. 1126-1132
Author(s):  
Hitoshi ASANO ◽  
Terushige FUJII ◽  
Yoshinori HISAZUMI ◽  
Toshihiro HORI ◽  
Tetsuo ABIKO ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Latent Heat ◽  
Dynamic Characteristics ◽  
Heat Supply ◽  
Heat Storage ◽  
Storage Unit

Dynamic Characteristics of a Mistuned Heat Exchanger in Cross-Flow

2007 ◽  
Author(s):  
Bo-Wun Huang ◽  
Huang-Kuang Kung ◽  
Jao-Hwa Kuang
Keyword(s):  
Heat Exchanger ◽  
Shock Waves ◽  
Dynamic Characteristics ◽  
Tube Bundle ◽  
Cooling Water ◽  
Cross Flow ◽  
Water Film ◽  
Local Defect ◽  
Mode Localization ◽  
Localization Phenomenon

The dynamic behaviors of tubes of a heat exchanger are frequently affected by the existence of local flaw. These tubes are worn from the hot-cold fluid shock waves. This local defect may alter the tube dynamics and introduce mode localization in the periodically arranged tube array. The variation of the dynamic characteristics of a component cooling water heat exchanger with wear tubes in cross-flow is investigated in this study. Periodically coupled cooling tubes are used to approximate a heat exchanger. Each tube is considered to be coupled to adjacent tubes through the squeezed water film in the gaps. This work addresses the probability of mode localization is occurring in a heat exchanger in cross-flow. A dynamic model of the coupled tube bundle is proposed. The numerical results reveal that the local defect in a tube array may introduce the so-called mode localization phenomenon in a periodically coupled tube bundle.

Fretting Wear of Heat Exchanger Tubes—Part II: Models

1979 ◽  
Vol 101 (4) ◽  
pp. 630-633 ◽  
Author(s):  
R. D. Blevins
Keyword(s):  
Experimental Data ◽  
Heat Exchanger ◽  
Relative Motion ◽  
Empirical Models ◽  
Fretting Wear ◽  
Support Plate

Conceptual and empirical models are developed for the fretting wear of heat exchanger tubes. The models based on the experimental data of Part I of this series and on the concept that fretting wear is the result of relative motion between the tube and the support plate.

Dynamic Characteristics of a Free-Flow-Channel Heat Exchanger

2011 ◽  
Vol 32 (5) ◽  
pp. 390-398
Author(s):  
Na Qin ◽  
Jun Zhao ◽  
Yan Jing Xiang ◽  
Peng Zhi Hao
Keyword(s):  
Heat Exchanger ◽  
Dynamic Characteristics ◽  
Flow Channel ◽  
Free Flow
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