Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system

Haldenwang, Rainer; Kotze, Reinhardt; Chhabra, R.P.

doi:10.1590/s1678-58782012000300008

Cited by 15 publications

(4 citation statements)

References 24 publications

(19 reference statements)

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“…The 122 flow behavior was also studied based on the experimental observation (Kozicki and Tiu 1986;. Haldenwang et al (2012) and Kotze (2007) obtained the extensive experimental results on the velocity profile of non-Newtonian fluid by using Ultrasonic Velocity Profiling (UVP) technique. However, significant variations were observed in the results of these models and experiments.…”

Section: Velocity Profilementioning

confidence: 99%

Geotechnical Properties and Flow Behavior of Coal Refuse under Static and Impact Loading

Yu¹,

Zeng

Michael³

2019

J. Geotech. Geoenviron. Eng.

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Section: Velocity Profilementioning

confidence: 99%

Geotechnical Properties and Flow Behavior of Coal Refuse under Static and Impact Loading

Yu¹,

Zeng

Michael³

2019

J. Geotech. Geoenviron. Eng.

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“…The mechanical properties of commercial fibers exceed those of commonly used steel and aluminum. On the other hand, the mechanical properties of pitch-based general-purpose carbon fibers exhibit a wide gap relative to those previously mentioned by 0.5-1.0 GPa tensile strength, [30][31][32][33][34][35][36][37][38][39][40] GPa modulus, and 1.4%-2.4% elongation. The requirements for carbon fiber products used in automotive applications are considerably lower than what is currently available, as shown in Table 1.…”

Section: Introductionmentioning

confidence: 88%

“…6. Koombhongse et al [39] also reported that these types of fibers could be formed via show Newtonian flow behavior [27][28][29][30][31][32][33][34]. However, Br-EB and Th-EB exhibit Bingham behavior, suggesting that Br-EB and Th-EB have a molten state similar to that of mesophase pitches.…”

Section: Pitch Based Cnfs From Electrospinningmentioning

confidence: 99%

Pitch based carbon fibers for automotive body and electrodes

Yang

Kim

Yoon³

2014

Carbon letters

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Pitch is an attractive raw material for carbon fiber precursors due to its low cost stemming from its availability as a residue of coking and petroleum processes. Ford Motor Company reported a carbon fiber target price of $11.0/kg by using a fast cycle-time manufacturing method with carbon fiber in an inexpensive format, allowing for an average retail price of gasoline of $3.58/gallon. They also recommended the use of carbon fiber with strength of 1700 MPa, modulus of 170 GPa, and 1.5% elongation. This study introduced a ca. 5.5 μm carbon fiber with 2000 MPa tensile strength obtained from a precursor through simple distillation of petroleum residue. Petroleum pitch based carbon nanofibers prepared via electrospinning were characterized and potential applications were introduced on the basis of their large specific surface area and relatively high electrical conductivity.

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“…In a straight pipe this makes no difference or even for the open channel geometry, see e.g. [5]; however, when measuring in highly complex geometries, it is necessary to have an ultrasonic beam parallel to the transducer in order to simplify planning of measurement lines as well as transducer installation.…”

Section: Velocity Profilesmentioning

confidence: 99%

Ultrasound Doppler measurements inside a diaphragm valve using novel transducer technologies

Kotze

Wiklund

2014

Meas. Sci. Technol.

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In this project, velocity profiles were measured in a diaphragm valve using an ultrasonic velocity profiling (UVP) technique. A non-Newtonian CMC model fluid was tested in this highly complex geometry and velocity profiles were measured at four different positions at the centre (contraction) of a specially manufactured 50% open diaphragm valve. The coordinates of the complex geometry and velocity magnitudes were analysed and compared to the bulk flow rate measured using an electromagnetic flow meter. Two different ultrasonic transducers (standard and delay line) were used and results were compared in order to assess velocity data close to wall interfaces as well as the accuracy and magnitude of measured velocities. The difference between calculated and measured flow rates was 32% when using the standard ultrasonic transducers. The error difference decreased to 18% when delay line transducers were introduced to the measurements. The velocity data obtained in the diaphragm valve showed a significant improvement close to the wall interfaces when using the delay line transducers. The main limitation when using delay line transducers is that beam refraction can significantly complicate measurements in a highly complex geometry such as a diaphragm valve. A new delay line transducer with no beam refraction could provide a solution. The introduction of delay line transducers showed that UVP can be used as a powerful tool for detailed flow behaviour measurements in complex geometries.

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Determining the viscous behavior of non-Newtonian fluids in a flume using a laminar sheet flow model and Ultrasonic Velocity Profiling (UVP) system

Cited by 15 publications

References 24 publications

Geotechnical Properties and Flow Behavior of Coal Refuse under Static and Impact Loading

Geotechnical Properties and Flow Behavior of Coal Refuse under Static and Impact Loading

Pitch based carbon fibers for automotive body and electrodes

Ultrasound Doppler measurements inside a diaphragm valve using novel transducer technologies

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