An Experimental Study of Near-wall Turbulence Properties in Highly Drag Reduced Pipe Flows of Pseudoplastic Polymer Solutions PDF Download
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Author: Larry Gregg Chorn
Publisher:
ISBN:
Category :
Languages : en
Pages : 482
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Author: Larry Gregg Chorn
Publisher:
ISBN:
Category :
Languages : en
Pages : 482
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 722
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 338
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Author: R. Goldstein
Publisher: Routledge
ISBN: 1351447831
Category : Technology & Engineering
Languages : en
Pages : 600
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Book Description
This revised edition provides updated fluid mechanics measurement techniques as well as a comprehensive review of flow properties required for research, development, and application. Fluid-mechanics measurements in wind tunnel studies, aeroacoustics, and turbulent mixing layers, the theory of fluid mechanics, the application of the laws of fluid mechanics to measurement techniques, techniques of thermal anemometry, laser velocimetry, volume flow measurement techniques, and fluid mechanics measurement in non-Newtonian fluids, and various other techniques are discussed.
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Category : Fluid dynamics
Languages : en
Pages : 386
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Category : Petroleum
Languages : en
Pages : 532
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Since the discovery of the drag reduction effects of even small amount of macromolecules in solutions in turbulent pipe flows, there have been many experimental and theoretical studies in order to understand mechanisms behind this phenomenon. Theories have been proposed based on the observations on the change in the characteristics of the turbulent flow near the pipe wall where friction of the momentum transfer between the flow and the conduit takes place. In this study drag reduction in fully developed turbulent pipe flow with four concentrations (200 to 500 wppm) of low molecular weight Sodium Carboxymethylcellulose (CMC) in aqueous solutions was investigated experimentally. Drag reduction was determined by pressure drop measurements. In order to observe the impact of the presence of CMC on the flow, Ultrasound Doppler Velocimetry (UDV) was employed to monitor the instantaneous velocity distributions. UDV is a non-invasive technique allowing one to obtain quick velocity profiles. Experimental measurements were used to calculate Fanning friction factor and radial distributions of the axial time-averaged velocity, velocity fluctuation (turbulent intensity) and eddy viscosity. The drag reduction level was determined through the Fanning friction factor versus Reynolds number data. Velocity data could be obtained as close as 3 mm to the wall by UDV. Two impacts of increasing CMC concentration on the flow field, hence pressure drop, were observed. The first effect was the decrease of the mean velocity gradient especially near the wall with increasing polymer amount which in turn gave rise to lower friction factor or pressure drop. In addition smaller eddy viscosities were obtained in the flow. The second impact of the polymer addition was on the velocity fluctuation or turbulent intensity variation along the radial distribution. An increasing trend in turbulence intensity in the turbulent core with polymer addition was observed. This was in agreement with the earlier st.
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Category : Dissertations, Academic
Languages : en
Pages : 736
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Author:
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 956
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Author: Peter North Blossey
Publisher:
ISBN:
Category :
Languages : en
Pages : 284
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