Closure to “Discussions of ‘Frequency Dependent Friction in Transient Pipe Flow’” (1968, ASME J. Basic Eng., 90, pp. 413–414)

1968 ◽  
Vol 90 (3) ◽  
pp. 414-414 ◽  
Author(s):  
W. Zielke
Keyword(s):  
Pipe Flow ◽  
Frequency Dependent ◽  
Transient Pipe Flow

scholarly journals Frequency-Dependent Friction in Transient Pipe Flow

1968 ◽  
Vol 90 (1) ◽  
pp. 109-115 ◽  
Author(s):  
W. Zielke
Keyword(s):  
Pipe Flow ◽  
Response Curve ◽  
Method Of Characteristics ◽  
Mean Velocity ◽  
Frequency Dependent ◽  
Velocity Changes ◽  
Transient Pipe Flow ◽  
Laminar Pipe Flow ◽  
Experimental Pressure ◽  
Theoretical Results

An equation is derived, which relates the wall shear stress in transient laminar pipe flow to the instantaneous mean velocity and to the weighted past velocity changes. The term is applied to the method of characteristics to calculate water-hammer phenomena in viscous fluids, in which effects of frequency-dependent friction cause distortion of traveling waves. Theoretical results are compared with the experimental pressure fluctuation due to an instantaneous valve closure and show accurate prediction of the response curve.

Numerical and experimental investigation of transient pipe flow

1994 ◽  
Vol 32 (5) ◽  
pp. 689-706 ◽  
Author(s):  
Amgad S. Elansary ◽  
M. Hanif Chaudhry ◽  
Walter Silva
Keyword(s):  
Experimental Investigation ◽  
Pipe Flow ◽  
Transient Pipe Flow

Frequency-dependent friction in oscillatory laminar pipe flow

1974 ◽  
Vol 16 (11) ◽  
pp. 819-827 ◽  
Author(s):  
D.A.P. Jayasinghe ◽  
M.S. Letelier ◽  
H.J. Leutheusser
Keyword(s):  
Pipe Flow ◽  
Frequency Dependent ◽  
Laminar Pipe Flow
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