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 24 for “"Mixing performance"”.
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… competitive reactions in order to determine its mixing effectiveness. The ultrasonic energy enhances micromixing of the fluid jet streams, which results in an overall mixing effectiveness improvements in different physical and chemical processes. In the competitive reactions system used here …
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Evaluation of the thermal and mixing performance of an agitated vessel for processing of complex liquid foodstuffs
… attributes. In this study, the heating and mixing efficiency of a bespoke vessel used for heat treatment of complex foodstuffs (250 litre ‘Vesuvio’ vessel manufactured by Giusti Ltd) was investigated. Enzymatic Time Temperature Integrators (TTIs) were used to determine the heat treatment …
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Experimental investigation of normal, sonic injection through a wedge-shaped nozzle into supersonic flow
… jet area growth rate were used to compare the mixing performance of the nozzles. Oil flow photography was used to determine the size of the three-dimensional boundary layer separation zone in front of each nozzle, and nanoshadowgraph photography was used to visualize the system of shocks and …
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Mixing in high throughput experimentation reactors
… a low Reynolds Number, Re, which results in poor mixing efficiencies. Together with unconventional geometries, i.e. lack of baffles and simple impeller designs, their fundamentals are not fully understood. The present study applies Particle Image Velocimetry (2-D PIV) and Planar Laser Induced …
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Experimental investigation of the fluid velocity distribution in stirred tank reactors equipped with retreat-blade impellers using laser doppler velocimetry
… industry for at least the past 40 years, the mixing characteristics of these systems have not been studied to any great extent, making it difficult to predict mixing performance in any given operation. In this work, the velocity distribution inside the typical glass-lined vessel/impeller …
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Jet Fluid Mixing Control Through Manipulation Jet Fluid Mixing Control Through Manipulation of Inviscid Flow Structures
Rapid mixing is crucial for the efficient and environment-friendly operation of many industrial and propulsion devices involving jet flows. In this dissertation, two methodologies, self-excited nozzles and radially lobed nozzles, are studied and presented in order to enhance mixing in the near …
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Preliminary design of a liquid bipropellant microfabricated rocket engine
… chamber is believed to be dependent on the mixing performance of an innovative injection scheme which features inter-digitated fuel/oxidizer jets impinging at a 180° angle. The nozzle is projected to perform satisfactorily, incurring a mere 2% loss in thrust according to 2D CFD calculations. …
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A numerical study on microbubble mixer
This text comprises a numerical study of the mixing performance on the micromixer, a device which actuates steady streaming by semi-cylindrical sessile bubble oscillations. The mixer's capability of producing chaotic mixing is confirmed and a numerical simulation that is in good agreement with the …
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Development of three-dimensional (3D) grayscale Photolithography process for microfluidic curvature Structures
… have been fabricated and achieve a good mixing performance. In sum, a 3D microfabrication by grayscale photolithography technique has been developed, with functional applicability for fabrication of several microfluidic functions.
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Continuous blending of dry pharmaceutical powders
… ow behavior studies were followed by blender performance studies. The dependence of the mixing performance of the continuous blending system on different operational variables like rotation rates of mixing elements and raw material properties like particle size, shape and cohesion were …
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Fuel-vortex interactions for enhanced mixing in supersonic flow
… was conducted to compare the supersonic mixing performance between a novel aerodynamic ramp injector and a physical ramp injector. The aerodynamic ramp injector consisted of nine, flush-wall jets arranged to produce multiplicative fuel-vortex interactions for mixing enhancement in a …
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Exploration of parameters for the continuous blending of pharmaceutical powders
… shift necessitates a deeper understanding of the mixing process informed by particle dynamics and variable interdependencies. The thesis aims to establish a framework for characterizing and improving continuous pharmaceutical blending using a tiered experimental methodology and multivariate …
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Concentration And Velocity Fields Throughout The Flow Field Of Swirling Flows In Gas Turbine Mixers
… mixers in an effort to better understand the mixing of fuel and air in gas turbine mixers. The two gas turbine mixers consisted of an annular flow profile and incorporated swirl vanes to produce a swirling flow to promote fuel/air mixing. The fuel was injected into the bulk flow from the …
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Bayesian phylogenetic models for relaxed clock and trait evolution
… by e ective samples per hour and overall mixing performance. An integrative model is proposed to jointly estimate phylogenetic trees using continuous traits, molecular sequences and fossils, where the evolution of continuous traits is modelled by a Brownian motion process. Methods that …
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Design, Fabrication, and Testing of a 3D Printer Based Microfluidic System
… applied driving pressure of 40psi. A qualitative mixing performance was conducted with the micro-mixer. The diffusion of two dyes was tested under an active mix and non-active mix condition. Testing showed that the active mixing condition resulted in a complete diffusion as opposed to the …
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3D integration of micro- and nanostructures into bio-analytical devices
… channel was used for quantifying the degree of mixing and evaluating the mixing performance of all four different microdevices. Experimental and simulation results show that by patterning the surface of the micromixer, flow patterns can be manipulated, which can improve mixing through stretching …
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Lagrangian studies of turbulent mixing in a vessel agitated by a rushron turbine: positron emission particle tracking (PEPT) and computational fluid dynamics (CFD)
… polymers and foods. In order to design efficient mixing vessels, a deep understanding of the blending processes is required. In cases where the fluid is not completely transparent, traditional optical laser based techniques are ineffective. One of the most promising techniques to study opaque …
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Study on mixing, modelling and control of an SCR system
… commonly used before SCR reactors to improve the mixing between ammonia and exhaust gases. 4 novel static mixers have been designed and the performance of the mixers is compared in the study. An experiment has been conducted to validate the mixing performance and pressure loss of the static mixers …
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Characterisation of turbulent mixing and its influence on antisolvent crystallisation
Mixing is a fundamental part of many processes in chemical engineering. In order for molecular processes to proceed there is an implicit requirement for molecular scale mixing. Many processes are so slow that they are effectively independent of mixing as mixing is fast relative to the process. …
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Experimental investigation of mixing time in a stirred, torispherical-bottomed tank equipped with a retreat-blade impeller
… tank a single baffle mounted from the top. The mixing performance of such reactors has not received significant attention in the literature, despite their ubiquitous presence in the pharmaceutical industry. In particular, mixing time, i.e., the time required by the system to achieve a predefined …
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