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.
Results
Showing 1 to 20 of 84 for “"Separation Efficiency"”.
-
Gypsum seeding to prevent scale formation and improve separation efficiency
Eutectic freeze crystallization (EFC) is a novel separation technique that can be applied to treat brine solutions such as reverse osmosis retentates. These are often a mixture of different inorganic solutes. The treatment of calcium sulphate-rich brines using EFC often results in gypsum …
-
On the energy and separation efficiency of dense medium cyclone coal beneficiation processes
… environmental pollution, improving the energy efficiency of energyintensive industrial processes is a research topic of increasing importance. The mining industry is one such heavy energy user. In particular, pumping systems are responsible for a noticeable portion of the total energy usage and …
-
Fine coal beneficiation: comparison study of the separation efficiency of a dense medium cyclone and flat-bottom cyclone
… High levels of NGM in coal impede classifier separation efficiency because NGM particles have low settling rates, which hinder free particle movement during classification. Low-grade coal has a high ash and near-gravity material content, making it economically unviable to beneficiate. As …
-
Density Modulated Semi-Packed Micro Gas Chromatography Columns
… columns causes a significant sacrifice in separation efficiency. This thesis covers the techniques for evaluating the separation column in a gas chromatography system as well as the important parameters that have the most effect on a column’s efficiency. Ionic liquids are introduced as a …
-
A computational and experimental investigation into the performance of industrial refrigeration helical oil separators
… heat exchangers which leads to a reduction in efficiency of the system and increased operating costs. The Henry Technologies helical oil separator operates in refrigeration systems globally yet there is currently no available data on the performance of the unit. In this investigation the …
-
Flow and separation of the oil from compressor discharge to external separator
… has a side effect on the heat transfer and total efficiency. Oil separator is an important component to reduce the amount of oil circulating in the system and to keep the oil in the compressor. Though commonly applied in the industry, oil separator still needs a systematic design guideline. The …
-
Mechanisms of Particle Separation in Aerodynamic Air Cleaning
… recommended for calculating the particle separation efficiency.
-
Pulsed field separation of biomolecules in a nanofluidic filter array
… fields are introduced as a means to enhance separation efficiency of biomolecules in a nanofluidic filter array channel. Separation under pulsed fields was tested using PBR322 DNA, Lambda Hind III DNA, and a sample containing three SDS denatured proteins. Pulsed fields are divided into long …
-
Surface plasmon polariton mediated energy transfer from external antennas into organic photovoltaic cells
… the tradeoff between light absorption and charge separation efficiency remains pervasive; increasing light absorption by increasing the device thickness leads to a decrease in exciton diffusion efficiency and vice versa. In this thesis, I demonstrate organic solar cells with an external light …
-
Purification of metals through filtration and electromagnetic separation
… purification were investigated. Electromagnetic separation experiments at frequencies of 63 - 120 kHz and aluminum filtration experiments using both conventional Al₂O₃ filters and AlF₃ coated Al₂O₃ filters were carried out by flowing molten aluminum through, and partly solidified in the filter …
-
Optimisation of Mare's Tail coalescer technology.
… diameter - that affect both the coalescence efficiency and the separation efficiency were identified. These parameters were then grouped together to form an initial semi-empirical model (SEM). From the initial SEM, SEM1 and SEM2 were developed based on experiments conducted in the bespoke …
-
Improving Efficiencies in Water-Based Separators Using Mathematical Analysis Tools
… were made in areas, including unit capacity and separation efficiency. One process-engineering tool, known as linear circuit analysis, identified an alternative coal spiral circuit configuration that offered improved performance while maintaining a reasonable circulating load. In light of this …
-
Sugarcane green ceramic hollow fibre membrane for oily wastewater separation
… with TEOS and MTES through sol-gel method for separation oily wastewater. Various grafting parameters such effect of grafting time, grafting cycle and calcination temperature were conducted towards membrane performance and morphology. The newly-developed ss-CHFM/WSBA induced excellent …
-
A comprehensive study of the electrochemistry and floatability of pyrite in coal flotation
… There are three major reasons for the low separation efficiency of liberated pyrite from coal by flotation. They include self-induced hydrophobicity of pyrite caused by superficial oxidation, nonselective hydraulic entrainment of pyrite particles into froth product, and incomplete …
-
Evaluation of Methods for Improving Classifying Cyclone Performance
… particulate streams in order to maximize the efficiency of their unit operations. Classifiers are generally considered to be more practical than screens for fine sizing, but the separation efficiency decreases dramatically for particles smaller than approximately 150 μm. In addition, …
-
Development of the selective-shear coagulation process for ultrafine coal cleaning
… energy input, were studied. It was found that separation efficiency improved with decreasing particle size. An optimum feed percent solids was found by maximizing separation efficiency. In the case of distilled water, test results revealed that additional specific energy provided by mechanical …
-
Semi-Packed Micro Gas Chromatography Columns
Separation of complex gaseous mixtures using gas chromatography (GC) is an important step in analytical systems for environmental monitoring, medical diagnosis, and forensic science. Due to its high resolving power, analysis speed, and small sample size, GC, has become the premier technique for …
-
Hydrocyclone fractionation of chickpea flour and measurement of physical and functional properties of flour and starch and protein fractions
… by pin milling and air classification with high separation efficiency. However, chickpea exhibits low separation efficiency because it has a relatively high fat content compared to other pulses. Therefore, the main goal of this research was to improve the starch-protein separation from chickpea …
-
The vertical flow centrifugal gas-liquid separator and its application to the removal of gases from geothermal wells
… gastube diameters have been shown to give high separation efficiencies. Sharp vortex generator blade exit angles have been shown to give the best performance especially with slugging inlet flow which occurs at relatively low vapour mass fractions. The distance between the vortex generator and …
-
Formulation of electrophoretic module for integration onto silicon-on-insulator neural probes
… especially in neurochemistry, due to its high separation efficiency and ability to analyze complex mixtures at a small scale [1]. However, challenges remain when it comes to scaling CE systems to match the demands of specific applications, particularly in situations where sample volume is …
Page 1 of 5