Yeunun Choo Thursday, May 5,1: Sacrificing accuracy for speed, preliminary propeller design tools are based on inviscid flow theory and often ignore the coupling between the viscous boundary layer and the otherwise inviscid blade loading. Modeling VLC is especially important for propellers with modern trailing edges, because flow separation off the trailing edge also alters the loading. The problem is that while methods exist to account for viscous-load coupling, no VLC method is simultaneously robust, accurate, and fast.
PhD thesis, University of Nottingham. Preview Download 15MB Preview Abstract Within the oil industry there is a need to measure and predict the form of the multiphase liquid and gas flows that are present within oil production and processing pipelines.
Knowledge of the flow regimes present allows the engineer to optimise the configuration of the pipeline and downstream processes to achieve the most, economic and reliable design. The applications of these technologies are collectively known as flow assurance.
Within oil production systems, one component which has received little attention is the characterisation of the multiphase flow around bends under various process conditions.
To predict the flow regimes in greater details requires the development of instrumentation that can measure and characterise the flow within the pipes.
To circumvent this challenge, two experimental investigations were carried out in two rigs available in the Chemical and Environmental Engineering Laboratories at the University of Nottingham. The first two provide time and cross-sectionally resolved data on void fraction.
The ECT probes were mounted 10 diameters upstream of the bend whilst the WMS was positioned either immediately upstream or immediately downstream of the bend. The downstream pipe was maintained horizontal whilst the upstream pipe was mounted either vertically or horizontally.
The superficial velocities of the air ranged from 0. The former was measured using the ring conductance probes placed 17 and 21 diameters, respectively upstream and downstream of the bend, 45o, 90o and o within the bend. The latter were obtained using pin and parallel wire probes.
The pin probes were used for thin films measurement whilst the parallel wire probes for thick films. The superficial velocities of the air ranged from 3. Bubble, stratified wavy, slug, semi-annular and annular flows are seen after the bend for the vertical 90o bend, the flow patterns remained the same as before the horizontal 90o bend.
These results were confirmed by the high-speed videos taken around the bend. For the vertical o return bend, the average film fraction was identified to be higher in straight pipes than in bends.
For low liquid and higher gas flow rates, due to the action of gravity drainage, film breakdown occurs at the 45o bend.
A previously proposed criterion, to determine stratification after the 90o bend, based on a modified Froude number have been shown to be valid for a liquid different from that tested in the original paper. Similarly, for the o return bend, the condition for which the liquid goes either to the inside or outside of the bend are identified based on published material.
Variations between average liquid film thickness and bend angles are reported for the vertical o bend. Contrary to the conclusions reached by Hills and Anderson and Hillsthe liquid film thickness becomes annular flow in the o bend at low liquid flow rates and stratified flow at higher liquid superficial velocities.
The modelling results are validated with the experiments and also provide more detailed information on the flow such as the velocity field.NMSU, ME, “Computational and Theoretical Fluid Mechanics”, graduate level NMSU, ME, “Advanced Computational Fluid Dynamics”, graduate level Graduate Student Advising.
PhD Writing Material. The shown image is me during the last period of writing up my PhD thesis: The following thesis outline is recommended for a thesis structure in the field of computational fluid dynamics (CFD) different fields have different approaches.
This dissertation presents a computational fluid dynamics (CFD) study of the flow around a rotating disc in forward flight. The computer model of the disc was an oblate ellipsoid.
|Group Alumni | Kutz Research Group||With CFD Lab colleagues and graduate students, Baker is widely published including 74 archival journal articles, conference proceedings papers, chapter contributions in 9 monographs and 71 research contract reports.|
|Search form||Physiological lesion assessment with indices such as fractional flow reserve FFR is now accepted as the invasive gold-standard for diagnosing the significance of CAD and for guiding treatment.|
The CFD Lab organized graduate academic program has matriculated some three dozen PhD-MSc degrees during his tenure as Director. His PhD is in Engineering Science, SUNY/Buffalo, , with dissertation topic in atmospheric pressure magnetohydrodynamic plasmas. COMPUTATIONAL FLUID DYNAMICS MODELING OF TWO-DIMENSIONAL AND THREE-DIMENSIONAL SEGMENTED FLOW IN MICROFLUIDIC CHIPS A Thesis Presented to The Faculty of the Department of Chemistry.
“Functional Assessment of the Thoracic Aorta in Patients with Aortic Valve Pathology using Patient-Specific Computational Fluid Dynamics” Pouya Youssefi. King’s College London, PhD Thesis. King’s College London, PhD Thesis.