dspaceThe Cape Peninsula University of Technology (CPUT) Electronic Theses and Dissertations (ETD) repository holds full-text theses and dissertations submitted for higher degrees at the University (including submissions from former Cape Technikon and Peninsula Technikon).

Show simple item record

dc.contributor.authorKotze, Reinhardt
dc.descriptionThesis (DTech (Electrical Engineering))--Cape Peninsula University of Technology, 2011en_US
dc.description.abstractUltrasonic Velocity Profiling (UVP) is both a method and a device to measure an instantaneous one-dimensional velocity profile along a measurement axis by using Doppler echography. UVP is an ideal technique since it is non-invasive, works with opaque systems, inexpensive, portable and easy to implement relative to other velocity profile measurement methods. Studies have suggested that the accuracy of the measured velocity gradient close to wall interfaces need to be improved. The reason for this is due to, depending on the installation method, distortion caused by cavities situated in front of ultrasonic transducers, measurement volumes overlapping wall interfaces, refraction of the ultrasonic wave as well as sound velocity variations. A new ultrasonic transducer, which incorporates a delay line material optimised for beam forming could reduce these problems (Wiklund, 2007). If these could be addressed, UVP could be used for the measurement of velocity profiles in complex geometries (e.g. contractions, valves, bends and other pipe fittings) where the shape of the velocity profile is critical to derive models for estimating fluid momentum and kinetic energy for energy efficient designs. The objective of this research work was to optimise the UVP system for accurate complex flow measurements by evaluating a specially designed delay line transducer and implementing advanced signal processing techniques. The experimental work was conducted at the Material Science and Technology (MST) group at the Cape Peninsula University of Technology (CPUT). This work also formed part of a collaborative project with SIK - The Swedish Institute for Food and Biotechnology. Acoustic characterisation of the ultrasonic transducers using an advanced robotic setup was done at SI K. Different concentrations of the following non-Newtonian fluids exhibiting different rheological characteristics were used for testing: carboxymethyl cellulose (CMC) solutions, kaolin and bentonite suspensions. Water was used for calibration purposes.en_US
dc.publisherCape Peninsula University of Technologyen_US
dc.subjectUltrasonic Velocity Profiling (UVP)en_US
dc.subjectDoppler echography.en_US
dc.subjectUltrasonic transduceren_US
dc.subjectMaterial Science and Technology (MST)en_US
dc.subjectSwedish Institute for Food and Biotechnology (SIK)en_US
dc.subjectCarboxymethyl cellulose (CMC) solutionsen_US
dc.subjectKaolin and bentonite suspensions.en_US
dc.titleDetailed non-Newtonian flow behaviour measurements using a pulsed ultrasound velocimetry method: Evaluation, optimisation and applicationen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-sa/3.0/za/