An analytical model of the ovalling oscillations of clamped-free and clamped-clamped cylindrical shells in cross-flow

1991 ◽  
Vol 5 (6) ◽  
pp. 605-626 ◽  
Author(s):  
A. Mazouzi ◽  
A. Laneville ◽  
P. Vittecoq
Keyword(s):  
Analytical Model ◽  
Cylindrical Shells ◽  
Cross Flow

Ovalling oscillations of thin circular cylindrical shells in a cross flow

1988 ◽  
Vol 2 (3) ◽  
pp. 285-307 ◽  
Author(s):  
Y. Uematsu ◽  
K. Uchiyama ◽  
M. Yamada ◽  
S. Sanjyo
Keyword(s):  
Cylindrical Shells ◽  
Cross Flow ◽  
Circular Cylindrical Shells

An Evaluation of a Two-Phase Damping Model on Tube Bundles Subjected to Two-Phase Cross Flow

2010 ◽  
Author(s):  
W. G. Sim ◽  
Njuki W. Mureithi
Keyword(s):  
Analytical Model ◽  
Mass Flux ◽  
Damping Ratio ◽  
Cross Flow ◽  
Experimental Results ◽  
Water Mixture ◽  
Two Phase ◽  
Phase Damping ◽  
Tube Bundles ◽  
Damping Model

The analytical model (Sim; 2007), to predict the two-phase damping ratio for upward cross-flow through horizontal tube bundles, has been evaluated. The damping model was formulated, based on Feenstra’s model (2000) for void fraction and various models (homogeneous, Levy, Martinelli-Nelson and Marchaterre) for two-phase friction multiplier. The analytical results of drag coefficient on a cylinder and two-phase Euler number were compared with the experimental results by Sim-Mureithi (2010). The factor, a relation between frictional pressure drop and the hydraulic drag coefficients, could be determined by considering experimental results. The two-phase damping ratios, given by the analytical model, were compared with existing experimental results. It was found that the model, based on Marchaterre’s model, is suitable for air-water mixture while the Martinelli-Nelson’s model for steam-water and Freon mixtures. The two-phase damping ratio is independent on pitch mass flux for air-water mixture, but it is more or less influenced by the mass flux for steam-water/Freon(134) mixtures. The two-phase damping ratios, given by the present model, agree well with experimental results for a sufficiently wide range of pitch mass ratio, quality and p/d ratios.

Mechanism of ovalling vibrations of cylindrical shells in cross flow

2001 ◽  
Vol 4 (2) ◽  
pp. 85-100 ◽  
Author(s):  
Yasushi Uematsu ◽  
Noboru Tsujiguchi ◽  
Motohiko Yamada
Keyword(s):  
Cylindrical Shells ◽  
Cross Flow

scholarly journals Extended semi-analytical model for the prediction of flow and concentration fields in a tangentially-fired furnace

2013 ◽  
Vol 17 (4) ◽  
pp. 1233-1243
Author(s):  
Amin Lotfiani ◽  
Shahram Khalilarya
Keyword(s):  
Analytical Model ◽  
Cross Sections ◽  
Cross Flow ◽  
Numerical Data ◽  
Solution Procedure ◽  
Zone Model ◽  
Extended Model ◽  
Cfd Simulations ◽  
Jet Trajectory ◽  
Computational Fluid Dynamics Cfd

Tangentially-fired furnaces (TFF) are one of the modified types of furnaces which have become more attractive in the field of industrial firing systems in recent years. Multi-zone thermodynamic models can be used to study the effect of different parameters on the operation of TFF readily and economically. Flow and mixing sub-model is a necessity in multi-zone models. In the present work, the semi-analytical model previously established by the authors for the prediction of the behavior of coaxial turbulent gaseous jets is extended to be used in a single-chamber TFF with square horizontal cross-sections and to form the flow and mixing sub-model of the future multi-zone model for the simulation of this TFF. A computer program is developed to implement the new extended model. Computational fluid dynamics (CFD) simulations are carried out to validate the results of the new model. In order to verify the CFD solution procedure, a turbulent round jet injected into cross flow is simulated. The calculated jet trajectory and velocity profile are compared with other experimental and numerical data and good agreement is observed. Results show that the present model can provide very fast and reasonable predictions of the flow and concentration fields in the TFF of interest.

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