Laws of Flow in Rough Pipes PDF Download
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Author: J. Nikuradse
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 62
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Book Description
An experimental investigation is made of the turbulent flow of water in pipes with various degrees of relative roughness. The pipes range in size from 25 to 100 millimeters in diameter and from 1800 to 7050 millimeters in length. Flow velocities permitted Reynolds numbers from about 10 (sup. 4) to 10 (sup. 6). The laws of resistance and velocity distributions were obtained as a function of relative roughness and Reynolds number. Mixing length, as described by Prandtl's mixing-length formula, is discussed in relation to the experimental results.
Author: J. Nikuradse
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 62
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Book Description
An experimental investigation is made of the turbulent flow of water in pipes with various degrees of relative roughness. The pipes range in size from 25 to 100 millimeters in diameter and from 1800 to 7050 millimeters in length. Flow velocities permitted Reynolds numbers from about 10 (sup. 4) to 10 (sup. 6). The laws of resistance and velocity distributions were obtained as a function of relative roughness and Reynolds number. Mixing length, as described by Prandtl's mixing-length formula, is discussed in relation to the experimental results.
Author: James Mueller Robertson
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 144
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Book Description
The considerable literature on turbulent flow past rough surfaces is correlated in terms of modes of presenting the smooth-to-rough transition and the influences of roughness density and shape. Flow measurements in a 3 in. smooth and sand roughened pipe and in an 8 in. steel pipe with 'natural' roughness are reported. The temporal-mean velocity and friction measurements show transitional (between smooth and fully rough behavior) variations. The pipe factor variation is also elucidated; the sand-roughened pipe studies indicate a shift in Nikuradse's presentation. The turbulence - as intensity divided by shear velocity and macroscale in ratio to pipe radius - in rough pipe flow appears the same in rough as in smooth pipe flow. The relative turbulence intensity is constant, or at most decreases slowly with increase in flow Reynolds number. (Author).
Author: James Calvin May
Publisher:
ISBN:
Category :
Languages : en
Pages : 442
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Book Description
Author: J. Nikuradse
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Book Description
Author: Garbis Hovannes Keulegan
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
Author: Robert P. Benedict
Publisher: John Wiley & Sons
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 562
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Book Description
Author: Radhey Shyam Srivastava
Publisher:
ISBN:
Category : Pipe
Languages : en
Pages : 92
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Book Description
Author: Roberto J. Muñoz Goma
Publisher:
ISBN:
Category : Permeability
Languages : en
Pages : 162
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Book Description
Author: Norman Ketzlach
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Author: Abdullah Sahal Shukri
Publisher:
ISBN: 9781369087666
Category : Fluid dynamics
Languages : en
Pages : 110
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Book Description
The pressure loss of turbulent power law fluid flow between parallel plates has been theoretically analyzed. Using Prandtl mixing length theory and Van Karman similarity hypotheses for turbulent flow, we have derived a new friction factor formula that resembles previous formula for turbulent power law fluid flow in rough pipes. The new formula is also valid for the transition region between smooth and wholly rough wall turbulence.
