Browsing Doctoral Degrees (Chemical Engineering) by Issue Date
Now showing items 1-20 of 86
-
A study of the use of statistical turbulence parameters in correlating axial dispersion data in the central core of air flowing in a pipe.
(1970)The longitudinal fluctuations at a point in the core of air flowing through a 15 cm. diameter pipe at a mean centerline velocity of 13.4 and 29.5 m/sec. were measured with a hot-wire anemometer. This signal, after analog ... -
Dispersion in slowly moving fluids.
(1970)This work is concerned with the characterization of slowly moving fluids and was carried out on the flow of water through a narrow sedimentation tank. Dispersion in the type of flow structure involved is caused mainly by ... -
A study of the cane sugar diffusion process.
(1972)A mathematical model has been developed to represent the extraction of sugar from sugar cane in the diffusion process. As a consequence of the structure of prepared cane, extraction is postulated to occur via two first ... -
An investigation of the regeneration of carbonised catalyst pellets in a packed bed reactor.
(1973)No abstract available. -
Changes in the chemical composition of sugar cane (Saccharum officinarum) during storage.
(1973)An outline is given of the South African sugar industry, with particular emphasis on the unit operations which make up the industrial process for manufacturing sugar from cane. Current knowledge of the chemistry of ... -
A study of the Fischer-Tropsch synthesis at elevated temperatures in a shock tube.
(1973)The shock tube was used to investigate the product spectrum of the initial stages of the Fischer-Tropsch synthesis carried out at elevated temperatures. Special attention was paid to the relationship between methane ... -
The predictive modelling of the performance of a crude oil fractionator in terms of gas chromotographic characterization.
(1973)No abstract available. -
Kinetic and mechanistic studies on the biological and chemical leaching of nickel from sulphide ores.
(1974)The aim of this investigation was to extend the knowledge of the bacterial leaching of copper and zinc sulphides into the area of nickel sulphide leaching. By far the major portion of both theoretical and practical expertise ... -
A study of an on-line recursive filter applied to a milling circuit.
(1975)No abstract available. -
The prediction of multicomponent ion exchange equilibria with particular reference to the system involved in the recovery of uranium.
(1976)The problem of predicting the general ion exchange equilibria pertaining to systems of industrial significance is generated by the multicomponent nature of such systems and the nonidealities which may be present in both ... -
An investigation of a supersonic chemical reactor.
(1977)The development of a supersonic chemical reactor is examined. The central concept of such a reactor is that gases can be expanded to supersonic speed which will result in a decrease in their static temperature to the ... -
Formulation and application of a dynamic model for atmospheric point sources.
(1977)No abstract available. -
A kinetic study of the dissolution of natural and synthetic sphalerite in aqueous sulphuric acid and in acidic ferric suplhate media.
(1977)Four sphalerites (synthetic, high grade natural, moderately impure flotation concentrate and highly impure flotation concentrate) were leached in acid sulphate media without and with ferric ions present under the following ... -
An investigation into the Fischer-Tropsch synthesis over supported ruthenium in a stirred gas-solid reactor.
(1979)A stirred gas-solid reactor has been used to study the Fischer-Tropsch synthesis over a supported ruthenium catalyst. Detailed catalyst characterisations were conducted on both fresh and used catalyst samples and included ... -
A study of processes occurring in flotation froths.
(1979)While the significant effect that the froth phase has on the performance of a flotation operation has recently been widely recognised, little work has been published which promotes an understanding of the physical processes ... -
Design and operation of a multistage pressurized fluidized bed combuster.
(1981)A three-stage Pressurized Fluidized Bed Combustor (PFBC) of principal dimensions, O,4Sm internal diameter by4m high was designed and fabricated to burn South African coals, with particular reference to coals unsuitable ... -
Gas residence time testing and model fitting : a study of gas-solids contacting in fluidised beds.
(1984)This work is concerned with the effect of vessel geometry on the hydrodynamics of fluidisation of a bed of milled iron oxide. The effect of going from a cold model representative of a typical pilot plant reactor to one ... -
Zonal separation and solids circulation in a draft tube fluidized bed applied to coal gasification.
(1984)In this thesis a fluidized bed containing a draft tube has been studied with the aim of developing the apparatus for coal gasification. The process has the capability of producing synthesis quality gas using air for ... -
A real time fluorescent particle counter for atmospheric dispersion studies.
(1985)No abstract available.