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The classification of slurries and other suspensions using ultrasonic techniques
The attenuation of ultrasonic waves travelling through a liquid containing a suspension of solids is highly dependent on frequency. At low frequencies, where the wavelength is long compared to the particle size, the particles move with the wave with some phase lag which gives rise to a loss componen...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2016
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| _version_ | 1867613738494853120 |
|---|---|
| access_status_str | Open Access |
| author | Davies, Andrew Lewis |
| author2 | Bell, J F W |
| author_browse | Bell, J F W Davies, Andrew Lewis |
| author_facet | Bell, J F W Davies, Andrew Lewis |
| author_sort | Davies, Andrew Lewis |
| collection | Thesis |
| description | The attenuation of ultrasonic waves travelling through a liquid containing a suspension of solids is highly dependent on frequency. At low frequencies, where the wavelength is long compared to the particle size, the particles move with the wave with some phase lag which gives rise to a loss component. At high frequencies, where the wavelength can be made comparable to, and ultimately less than the particle diameter, there is still some movement but most of the energy is lost to the wave by scattering. In this work, is attenuation used to characterize the suspension, and is treated in terms of these two components. Absorption which is the conversion of energy into heat and scattering from the actual particles. The former is expressed as loss (dB) per wavelength and increases with frequency, while the latter, in the short wavelength scattering zone simply obstructs the wave. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22143 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:40:55.370Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22143 The classification of slurries and other suspensions using ultrasonic techniques Davies, Andrew Lewis Bell, J F W Electrical Engineering The attenuation of ultrasonic waves travelling through a liquid containing a suspension of solids is highly dependent on frequency. At low frequencies, where the wavelength is long compared to the particle size, the particles move with the wave with some phase lag which gives rise to a loss component. At high frequencies, where the wavelength can be made comparable to, and ultimately less than the particle diameter, there is still some movement but most of the energy is lost to the wave by scattering. In this work, is attenuation used to characterize the suspension, and is treated in terms of these two components. Absorption which is the conversion of energy into heat and scattering from the actual particles. The former is expressed as loss (dB) per wavelength and increases with frequency, while the latter, in the short wavelength scattering zone simply obstructs the wave. 2016-10-16T09:45:01Z 2016-10-16T09:45:01Z 1985 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/22143 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Davies, Andrew Lewis The classification of slurries and other suspensions using ultrasonic techniques |
| thesis_degree_str | Master's |
| title | The classification of slurries and other suspensions using ultrasonic techniques |
| title_full | The classification of slurries and other suspensions using ultrasonic techniques |
| title_fullStr | The classification of slurries and other suspensions using ultrasonic techniques |
| title_full_unstemmed | The classification of slurries and other suspensions using ultrasonic techniques |
| title_short | The classification of slurries and other suspensions using ultrasonic techniques |
| title_sort | classification of slurries and other suspensions using ultrasonic techniques |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/22143 |
| work_keys_str_mv | AT daviesandrewlewis theclassificationofslurriesandothersuspensionsusingultrasonictechniques AT daviesandrewlewis classificationofslurriesandothersuspensionsusingultrasonictechniques |