710 Influence of the boundary layer on the inner wall of the circular duct for the perforated plate flow resistance measurement system

2008 ◽  
Vol 2008.45 (0) ◽  
pp. 235-236
Author(s):  
Katsuhiro KOIZUMI ◽  
Masaru ISHIZUKA ◽  
Shinji NAKAGAWA
Keyword(s):  
Boundary Layer ◽  
Measurement System ◽  
Flow Resistance ◽  
Perforated Plate ◽  
Resistance Measurement ◽  
Circular Duct

scholarly journals Propagation of Quasi-plane Nonlinear Waves in Tubes

10.14311/368 ◽  
2002 ◽  
Vol 42 (4) ◽  
Author(s):  
P. Koníček ◽  
M. Bednařík ◽  
M. Červenka
Keyword(s):  
Boundary Layer ◽  
Boundary Conditions ◽  
Nonlinear Waves ◽  
Numerical Solutions ◽  
Burgers Equation ◽  
Circular Duct ◽  
Generalized Burgers Equation ◽  
Kzk Equation ◽  
Model Equations ◽  
Diffraction Effects

This paper deals with possibilities of using the generalized Burgers equation and the KZK equation to describe nonlinear waves in circular ducts. A new method for calculating of diffraction effects taking into account boundary layer effects is described. The results of numerical solutions of the model equations are compared. Finally, the limits of validity of the used model equations are discussed with respect to boundary conditions and the radius of the circular duct. The limits of applicability of the KZK equation and the GBE equation for describing nonlinear waves in tubes are discussed.

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