An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries

 

Show simple item record

dc.contributor.advisor Lazarus, John en_ZA
dc.contributor.author Sive, Anthony Wyndham en_ZA
dc.date.accessioned 2016-02-24T11:14:14Z
dc.date.available 2016-02-24T11:14:14Z
dc.date.issued 1988 en_ZA
dc.identifier.citation Sive, A. 1988. An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17228
dc.description Bibliography: v. 1, p. 392-418. en_ZA
dc.description.abstract Mixed regime slurries are those slurries comprised of broad particle size distributions. Slurries of this type with volume concentration up to 50 (relative density of approximately 1.8) are considered.. An analytical model has been developed for such slurries. The inputs to the model are mean mixture flow rate, delivered. concentration and the particle and pipeline characteristics.. In order to calculate in situ concentration, the concentration distribution is found by using a diffusion model. A logarithmic velocity distribution is also required and is used to ascribe velocity values to volume elements in a concentric computational grid. Calculated values of mean mixture flow rate and delivered concentration are compared to the input values and an iterative procedure is employed to ensure equality with a result being the computation of in situ concentration. The model is applicable over the complete range of flow regimes including stationary bed, sliding bed and suspended flow. The particular regime prevalent for the input values will be ascertained by the model aid the energy gradient calculated. The model is compared to 3 existing correlations in the literature, for mixed regime flow, using 1345 data points collected at the University of Cape Town test facility and 1630 data points from other institutions. The test facility used comprises two systems each with two pipelines and separate centrifugal pumps. The four pipelines range from 50mm inside diameter to 140mm inside diameter. A data acquisition system continuously monitors pressures, velocity and temperature. Mixture concentration and velocity are checked using a weigh tank which is filled over a time interval by diverting the slurry flow. Pressures are checked with water manometers. The data acquisition system is interfaced to a microcomputer that calculates required. values and outputs tables and graphs of measured values. Detailed observations of the flow conditions are made through clear viewing sections in each pipeline. A qualitative investigation of periodic flow phenomena observed is presented. These are a result of sliding bed flow and include dunes, waves and slugs. A two-fluid model is proposed and the mechanisms whereby these structures form, grow and eventually disperse is discussed. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Civil Engineering en_ZA
dc.title An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Civil Engineering en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Sive, A. W. (1988). <i>An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/17228 en_ZA
dc.identifier.chicagocitation Sive, Anthony Wyndham. <i>"An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1988. http://hdl.handle.net/11427/17228 en_ZA
dc.identifier.vancouvercitation Sive AW. An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1988 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17228 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Sive, Anthony Wyndham AB - Mixed regime slurries are those slurries comprised of broad particle size distributions. Slurries of this type with volume concentration up to 50 (relative density of approximately 1.8) are considered.. An analytical model has been developed for such slurries. The inputs to the model are mean mixture flow rate, delivered. concentration and the particle and pipeline characteristics.. In order to calculate in situ concentration, the concentration distribution is found by using a diffusion model. A logarithmic velocity distribution is also required and is used to ascribe velocity values to volume elements in a concentric computational grid. Calculated values of mean mixture flow rate and delivered concentration are compared to the input values and an iterative procedure is employed to ensure equality with a result being the computation of in situ concentration. The model is applicable over the complete range of flow regimes including stationary bed, sliding bed and suspended flow. The particular regime prevalent for the input values will be ascertained by the model aid the energy gradient calculated. The model is compared to 3 existing correlations in the literature, for mixed regime flow, using 1345 data points collected at the University of Cape Town test facility and 1630 data points from other institutions. The test facility used comprises two systems each with two pipelines and separate centrifugal pumps. The four pipelines range from 50mm inside diameter to 140mm inside diameter. A data acquisition system continuously monitors pressures, velocity and temperature. Mixture concentration and velocity are checked using a weigh tank which is filled over a time interval by diverting the slurry flow. Pressures are checked with water manometers. The data acquisition system is interfaced to a microcomputer that calculates required. values and outputs tables and graphs of measured values. Detailed observations of the flow conditions are made through clear viewing sections in each pipeline. A qualitative investigation of periodic flow phenomena observed is presented. These are a result of sliding bed flow and include dunes, waves and slugs. A two-fluid model is proposed and the mechanisms whereby these structures form, grow and eventually disperse is discussed. DA - 1988 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1988 T1 - An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries TI - An analytical and experimental investigation of the hydraulic transport of high concentration mixed regime slurries UR - http://hdl.handle.net/11427/17228 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record