Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Pneumatic conveying"”.
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Pneumatic conveying in the dense and dilute phase
Pneumatic conveying is one of the backbones of chemical engineering as it has been used extensively in almost every industry. Yet many parameters involved in a usual conveying operation are not well understood. One important parameter is the solid concentration and solid flow behaviour after going …
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Prediction of pressure losses in pneumatic conveying pipelines
… the accuracy with which the pressure drop along pneumatic conveying pipelines in process plant could be predicted. The methods previously available for making this prediction are examined and critically assessed. The need for a different method is shown, and a new approach is developed and …
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The erosion of pipe bends in pneumatic conveying systems
… wear process in 90 pipe bends, by a stream of pneumatically conveyed suspensions of solid particles. From appropriate analysis of the test data, a basis of correlation in terms of the respective parameters has been established, from which the likelihood of erosion can be predicted. In order to …
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The interaction between rotary valves and pneumatic conveying pipelines
… the interaction between rotary valves and pneumatic conveying pipelines and the effect which this can have on overall system performance. A review of previous work and current industrial practice revealed that very little work has been published on this subject, although it was evident that …
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The influence of bulk particulate properties on pneumatic conveying performance
Interest in the use of dense phase conveying has grown considerably in recent years. However, not all products are capable of being conveyed in dense phase and it is often difficult to predict which products have dense phase capability without carrying out pilot conveying trials. The main objective …
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Hydro-pneumatic conveying of liquid by means of an airlift pump
Airlift pumps operating in two-phase gas-liquid flow are investigated with a view to establishing an analytical technique to aid in theoretically modelling air-lift pump behaviour. Extensive work on two test facilities constructed at the University of Cape Town's Hydrotransport Research facility …
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Optimisation of granola breakfast cereal manufacturing process by wet granulation and pneumatic conveying
… manufacturing processes by wet granulation and pneumatic conveying. Granola is an aggregated food product used as a breakfast cereal and in cereal bars. Processing of granola involves mixing the dry ingredients (typically oats, nuts, etc.) followed by the addition of a binder which can contain …
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Suction nozzle feeding mechanisms and their effect on the performance of vacuum pneumatic conveying systems
The pneumatic conveying of bulk solid materials by the generation of a partial vacuum or negative pressure is the oldest form of conveying such materials through pipelines. It was developed approximately one hundred years ago to assist the rapid unloading of wheat grain from ships, barges and …
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A pneumatic conveying powder delivery system for continuously heterogeneous material deposition in solid freeform fabrication
… compositions. This thesis explores a dense phase pneumatic conveying system that has the potential to deliver the powder in a controlled manner and allow for adjustment of material composition throughout the layer.
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The effect of particle size and density on pressure gradients in horizontal pipelines in lean phase pneumatic conveying
… accuracy of predicting the pressure losses along pneumatic conveying systems, and in particular, an investigation into the reasons why materials behave differently to each other when conveyed pneumatically along pipelines. It was intended that the information obtained from the project, would …
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A comparison between the pressure gradients in vertical and horizontal pneumatic conveying, with an investigation into the effect of pipeline bore in vertical conveying
… improve current techniques used in the design of pneumatic conveying systems. At present, the commonly used method to predict the pressure drop in a vertical pipeline in a pneumatic conveying system is to obtain the pressure gradient in a horizontal for the identical conveying conditions and …
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Characterisation and prediction of particle attrition in lean phase pneumatic conveyors: the influence of particle concentration
… within horizontal, homogeneous lean phase pneumatic conveying systems. Furthermore, to propose a characterisation method for predicting the magnitude of particle attrition in such pneumatic conveying systems. After conducting an extensive literature review, no conclusive research which …
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Numerical Simulation on Dilute Phase Pneumatic Transport
Pneumatic conveying is a technique that is widely used in many industrial mechanical and chemical applications. In the case of cement manufacturing pneumatic conveying is a large scale operation moving several kilograms of material per second which consumes electrical energy (operation of fans) and …
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Mathematical modelling and optimisation of the formulation and manufacture of aggregate food products
… the particle breakage of granola during pneumatic conveying produced by both a high shear granulator (HSG) and fluidised bed granulator (FBG) process were examined. Products were pneumatically conveyed in a purpose built conveying rig designed to mimic product conveying and packaging. …
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An investigation of the generation of acoustic emission from the flow of particulate solids in pipelines
The transport of particulate in a gas flow or pneumatic conveying system 1s widespread in many areas of industry, for example chemical, food processing, cement industries and transportation of pulverised coal in coal-fired power plants. However, a simple and reliable method for monitoring the flow …
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A study of the modes of gas-solids flow in pipelines
… flows can be observed in the pipeline of a pneumatic conveying system. These flows may be classified as one of three modes: i. suspension flow; ii. non-suspension moving-bed type flow; iii. non-suspension plug type flow. The modes of flow that a bulk material can achieve are dependent upon …
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Acoustic measurements of flowing and quasi-static particulate suspensions
… for transporting powdered solids (known as "pneumatic conveying"). The problem of measuring the mass concentration of the solid fraction has not yet been satisfactorily resolved. This thesis explores acoustic techniques to measure the particle concentration. Controlled suspensions -- both …
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A model to predict the lifetime of pneumatic conveyor bends
Bursts in pneumatic conveyor pipelines in industrial processes are a well-known hindrance to the smooth operation of any plant. Unanticipated stoppages can have serious financial implications for any company using pneumatic conveying technology, and health and safety factors are also paramount. …
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Instrumentation of partical conveying using electrical charge tomography.
… techniques are discussed and their relevance to pneumatic conveying considered. Electrical charge tomography systems are shown to be worthy of investigation. Electrodynamic sensors are inherently low cost and simple in concept. This sensor is used to detect the inherent charge on dry, moving …
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The use of laboratory erosion tests for the prediction of wear in pneumatic conveyor bends
… tester to predict the life of a bend in a pneumatic conveyor. Providing a link between a laboratory erosion tester and erosion tests on a pneumatic conveyor would lead to the development of an inexpensive way of predicting the life of a pipe bend operating under any given set of conveying …
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