{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/18016"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/18016","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Assessing vibrating viscometers in slurries","abstract":"A number of vibrating transducers for viscosity measurement described in the literature have been evaluated, with a view to developing an instrument for measuring gold-mine slurries. Appropriate electronic measuring methods are discussed, and related theory using a simple mathematical model is derived, and verified experimentally. A low frequency vibrating transducer is described which is capable of measuring apparent viscosities of slurries. Measurements made on Newtonian liquids at four different frequencies using the same transducer agree to ± 2%, and correlate closely with measurements made using a Redwood orifice viscometer. In order to determine the accuracy of the transducer for slurries, comparative measurements at four frequencies are used to obviate the need for a reference instrument. For a dilute (Newtonian) slurry, these measurements agree to ± 10%, but similar measurements on more concentrated (non-Newtonian) slurries show marked divergence of the curves at high frequencies. It is suspected that this behaviour is a property of the slurries, related in some way to their observed non-Newtonian behaviour. These results are of a qualitative nature, but point to the possible usefulness of the instrument for slurry measurement.","abstract_html":"A number of vibrating transducers for viscosity measurement described in the literature have been evaluated, with a view to developing an instrument for measuring gold-mine slurries. Appropriate electronic measuring methods are discussed, and related theory using a simple mathematical model is derived, and verified experimentally. A low frequency vibrating transducer is described which is capable of measuring apparent viscosities of slurries. Measurements made on Newtonian liquids at four different frequencies using the same transducer agree to ± 2%, and correlate closely with measurements made using a Redwood orifice viscometer. In order to determine the accuracy of the transducer for slurries, comparative measurements at four frequencies are used to obviate the need for a reference instrument. For a dilute (Newtonian) slurry, these measurements agree to ± 10%, but similar measurements on more concentrated (non-Newtonian) slurries show marked divergence of the curves at high frequencies. It is suspected that this behaviour is a property of the slurries, related in some way to their observed non-Newtonian behaviour. These results are of a qualitative nature, but point to the possible usefulness of the instrument for slurry measurement.","abstract_has_math":false,"creators":["Rachman, Yichal Aryeh"],"institution":"Department of Electrical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Besseling, Johann L N"],"committee_chairs":[],"committee_members":[],"year":1977,"date_issued":"1977","date_published":"1977","updated_at":"2026-07-22T22:23:26Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/18016","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Besseling, Johann L N"]},{"key":"dc:creator","label":"Author","values":["Rachman, Yichal Aryeh"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-03-21T19:03:14Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-03-21T19:03:14Z"]},{"key":"dc:date.issued","label":"Date","values":["1977"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Electrical Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc (Eng)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/18016"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Bibliography: pages 49-50."]},{"key":"dc:description.abstract","label":"Abstract","values":["A number of vibrating transducers for viscosity measurement described in the literature have been evaluated, with a view to developing an instrument for measuring gold-mine slurries. Appropriate electronic measuring methods are discussed, and related theory using a simple mathematical model is derived, and verified experimentally. A low frequency vibrating transducer is described which is capable of measuring apparent viscosities of slurries. Measurements made on Newtonian liquids at four different frequencies using the same transducer agree to ± 2%, and correlate closely with measurements made using a Redwood orifice viscometer. In order to determine the accuracy of the transducer for slurries, comparative measurements at four frequencies are used to obviate the need for a reference instrument. For a dilute (Newtonian) slurry, these measurements agree to ± 10%, but similar measurements on more concentrated (non-Newtonian) slurries show marked divergence of the curves at high frequencies. It is suspected that this behaviour is a property of the slurries, related in some way to their observed non-Newtonian behaviour. These results are of a qualitative nature, but point to the possible usefulness of the instrument for slurry measurement."]},{"key":"dc:title","label":"Title","values":["Assessing vibrating viscometers in slurries"]}]}],"canonical_facts":{"dc:contributor.advisor":["Besseling, Johann L N"],"dc:creator":["Rachman, Yichal Aryeh"],"dc:date.accessioned":["2016-03-21T19:03:14Z"],"dc:date.available":["2016-03-21T19:03:14Z"],"dc:date.issued":["1977"],"dc:description":["Bibliography: pages 49-50."],"dc:description.abstract":["A number of vibrating transducers for viscosity measurement described in the literature have been evaluated, with a view to developing an instrument for measuring gold-mine slurries. Appropriate electronic measuring methods are discussed, and related theory using a simple mathematical model is derived, and verified experimentally. A low frequency vibrating transducer is described which is capable of measuring apparent viscosities of slurries. Measurements made on Newtonian liquids at four different frequencies using the same transducer agree to ± 2%, and correlate closely with measurements made using a Redwood orifice viscometer. In order to determine the accuracy of the transducer for slurries, comparative measurements at four frequencies are used to obviate the need for a reference instrument. For a dilute (Newtonian) slurry, these measurements agree to ± 10%, but similar measurements on more concentrated (non-Newtonian) slurries show marked divergence of the curves at high frequencies. It is suspected that this behaviour is a property of the slurries, related in some way to their observed non-Newtonian behaviour. These results are of a qualitative nature, but point to the possible usefulness of the instrument for slurry measurement."],"dc:identifier.uri":["http://hdl.handle.net/11427/18016"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Electrical Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["Assessing vibrating viscometers in slurries"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc (Eng)"]},"updated_at":"2026-07-22T22:23:26Z"}