Дисертації з теми "Annual flow"
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Lam, Yung-chun Nelson, and 林勇進. "Annual distribution of phytoplankton in Tolo Harbour: a flow cytometry approach." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B3124192X.
Повний текст джерелаLam, Yung-chun Nelson. "Annual distribution of phytoplankton in Tolo Harbour a flow cytometry approach /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22718874.
Повний текст джерелаO, Dohonova K., and Bortnik Y. V. "Construction of dependence function of annual passenger flow and GPD per capita." Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50700.
Повний текст джерелаIn many problems of physics, economics, medicine, engineering, etc. we have to experimentally study the dependence of a random variable Y, observed, on one or more other random or non-random variables Х_1,Х_2,…,Х_n. Regression analysis is a branch of mathematical statistics that studies the dependence between random variables using regression equations, and regression is the functional dependence on average of any random variables.
Sukheswalla, Zubin Rohinton. "A statistical model for estimating mean annual and mean monthly flows at ungaged locations." Texas A&M University, 2003. http://hdl.handle.net/1969.1/192.
Повний текст джерелаGuo, Zhenyi. "CFD Simulation of Annular Flow Boiling in Microchannels." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14428.
Повний текст джерелаMeyer, Lucie. "The annual ragweeds (Ambrosia artemisiifolia L. - Ambrosia trifida L.) : adaptive response to chemical weeding and population genetics in agricultural environments." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK005.
Повний текст джерелаThe first aim of this work was to investigate the risk for the evolution of resistance to acetolactate synthase inhibitor (ALS) herbicides in the common ragweed (Ambrosia artemisiifolia L.) through four points: (i) the selection pressure (effectiveness of a range of ALS inhibitor herbicides), (ii) the adaptive response of Ambrosia artemisiifolia (recurrent selection experiment), (iii) a resistance monitoring in fields in France, and (iv) the investigation of the mechanisms underlying herbicide resistance (target-site (TSR) and non-target-site resistance (NTSR) using transcriptomic analyses). The second aim was to study the connectivity of A. artemisiifolia populations in agricultural landscapes using microsatellite markers developed during this work, to determine factors that could facilitate the spread of this invasive weed species and the spread of herbicide resistance.In regards to herbicide resistance:-The sensitivity of A. artemisiifolia to ALS-inhibiting herbicides is variable between active ingredients.-Plants that survived the French maximum authorized field rate and higher rates of metsulfuron were selected to implement a recurrent breeding program. After two selection cycles, the resistance level to metsulfuron increased and resistance to imazamox and tribenuron emerged.-Three cases of imazamox resistance were identified in the field, including two cases of pure NTSR and one case of TSR - NTSR coexistence.-A transcriptome for A. artemisiifolia, AMBELbase, was generated using the PacBio sequencing technology to search for genes involved in NTSR mechanisms (RNAseq approach). 62 candidate contigs were identified including ABC transporters, cytochromes P450 and glutathione S-transferases known to be involved in the degradation of herbicides.In regards to population connectivity:-26 microsatellite markers were developed and revealed high genetic variability. Genetic structuring has been studied on a large scale for populations of A. artemisiifolia from Europe (invasion range) and North America (native range).-On a finer scale (agricultural landscape), the genetic structure of populations was influenced by colonization events. Migration events detected among the areas colonized by A. artemisiifolia suggested moderate pollen/seed flows and connectivity at the farmland scale. In agricultural environments, herbicide resistant alleles could be easily spread among neighbouring populations via pollen flow, and also at longer distances via seed dispersal. Human-related activities play a major role in the dispersal of seeds (agricultural machinery, contaminated seed lots, etc.).-The mating system analysis confirmed that A. artemisiifolia is an obligate outcrossing species which leads to important intra- and inter-population gene flow.The knowledge acquired during this work may help to foster the development of better management strategies to effectively control A. artemisiifolia to limit its spread, such as:-Diversified weed control strategies: combination of mechanical (including false-seed) and chemical weeding (diversification of herbicide modes of action).-Longer diversified crop rotations including more winter crops and/or cover and competitive crops to break the life cycle of A. artemisiifolia.These knowledge may also be used to better control of another weed species of the genus Ambrosia, Ambrosia trifida L
Al-Yarubi, Qahtan. "Phase flow rate measurements of annular flows." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/9104/.
Повний текст джерелаMekanik, Abolghasem. "General solution for unsteady annular flows between concentric cylinders and annular flow-induced instabilities." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28844.
Повний текст джерелаThe method of solution has been applied to various 3-D unsteady flows in annular geometries, as well as to 2-D annular flows. The numerical results obtained are compared with those based on a mean position analysis, without transformation, for small-amplitude oscillation. This comparison shows that the time-dependent coordinate transformation is necessary to obtain accurate solutions for larger-amplitude oscillations.
The mean-position approach has also been applied to the analysis of axially variable annular configurations. The results obtained show more pressure recovery after a diffuser section with 6$ sp circ$ half-angle than in the case of 20$ sp circ$ half-angle.
A comprehensive experimental study was conducted to validate the theoretical results in the range of laminar flow. The results obtained were in good agreement with the numerical results, specially with those obtained by the time-dependent coordinate transformation. Experiments were also conducted for turbulent flow.
Based on the theoretical models developed, a computational method has been used to study fluid-structure interaction phenomena. It was applied to several cylindrical annular configurations in which one side of the annulus, the outer cylinder, is assumed to be flexibly supported, and thus to be susceptible to flow-induced instabilities. The structural and N-S equations were solved simultaneously by employing the numerical method developed for the unsteady flow and a fourth-order Runge-Kutta scheme for the structural motion. The numerical results thus obtained have predicted the stability of the structure for different annular geometries. The structure having a uniform annular geometry was shown to be more damped, while the annular geometry with a backward facing step is less damped. The study of the structure for a uniform annular geometry in the case of the rocking motion of the outer cylinder predicts an instability in the form of flutter of the outer cylinder.
Luo, Yuejin. "Non-Newtonian annular flow and cuttings transport through drilling annuli at various angles." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/1477.
Повний текст джерелаHawkes, Neil. "Wispy-annular flow." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/12043.
Повний текст джерелаJedwab, M. R. "Flow in annular diffusers." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233255.
Повний текст джерелаWang, Xiaohang. "Large eddy simulation of turbulent pipe/annular supercritical CO₂ flow with heat transfer and perfect gas flow in a ribbed annuli passage." [Ames, Iowa : Iowa State University], 2006.
Знайти повний текст джерелаDillon, Chad Michael. "Two-Phase Flow Within Narrow Annuli." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5097.
Повний текст джерелаWolf, Arne. "Film structure of vertical annular flow." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/8178.
Повний текст джерелаBadie, Shahrokh. "Horizontal stratifying annular gas liquid flow." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249385.
Повний текст джерелаMcQuillan, K. W. "Flooding in annular two-phase flow." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354843.
Повний текст джерелаWilletts, I. P. "Non-aqueous annular two-phase flow." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393120.
Повний текст джерелаFlores, Aaron G. (Aaron Guerrero). "Dryout limits in horizontal annular flow." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12872.
Повний текст джерелаTeixeira, Jose Carlos Fernandes. "Turbulence in annular two phase flow." Thesis, University of Birmingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.570318.
Повний текст джерелаShlyubsky, Dmitry Iosifovich. "Flow control in an annular-return flow using combustion-driven actuators." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/36537.
Повний текст джерелаMohri, K. "Supersonic flow over rectangular-section annular cavities." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501753.
Повний текст джерелаEkberg, Nathanial Paul. "Two-phase flow in horizontal thin annuli." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17250.
Повний текст джерелаYapici, Sinan. "Electrochemical mass transfer in annular swirl flow." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303777.
Повний текст джерелаBlasick, Ann Marie. "Onset of flow instability in heated horizontal annuli." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19538.
Повний текст джерелаJepson, D. M. "Vertical annular flow : the effects of physical properties." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316862.
Повний текст джерелаQiu, Yue. "Computational Investigation of Annular Flow Condensation in Microgravity." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1561039399443141.
Повний текст джерелаLorenz, David Joseph. "Wave-mean-flow interaction and the annular mode /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10036.
Повний текст джерелаMohapatra, Chinmoy Krushna. "Computational Study of Internal Two Phase Flow in Effervescent Atomizer in Annular Flow Regime." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741568.
Повний текст джерелаCurran, Stephen J. "Hydrodynamics and mass transport in an annular flow bioreactor." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508496.
Повний текст джерелаAltunbas, Ayse. "Study of two-phase annular flow in inclined pipes." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301659.
Повний текст джерелаChong, Li Yean. "Annular two phase flow in straight and serpentine channels." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403700.
Повний текст джерелаTARAZONA, VICTOR MANUEL CARDENAS. "FLOW OF PSEUDOPLASTIC FLUID IN ANNULAR WITH VARIABLE ECCENTRICITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8743@1.
Повний текст джерелаO estudo de escoamentos em espaço anular é de fundamental importância para o entendimento e otimização do processo de perfuração de poços. A lama de perfuração deve possuir propriedades reológicas e termofísicas tais que garantam um bom desempenho no carreamento de cascalho, na lubrificação e refrigeração das brocas, na limpeza do poço, manutenção da pressão da coluna de líquido para equilibrar a pressão das formações atravessadas e estabilizar as paredes do poço. Uma análise completa desta situação é extremamente complexa; o cilindro interno (coluna) pode estar girando, a geometria da parede do poço não é um cilindro perfeito, o espaço anular é excêntrico e a excentricidade varia ao longo do poço. Além disto, lamas de perfuração possuem um comportamento pseudoplástico, isto é a viscosidade é função decrescente da taxa de deformação. Os modelos que levam em conta todos esses fatores são extremamente complexos e caros computacionalmente. Os modelos disponíveis na literatura utilizam hipóteses simplificadoras para tornar a análise menos complexa. Muitos trabalhos consideram a rotação do cilindro interno e o comportamento não Newtoniano, mas desprezam a variação da excentricidade ao longo do poço. Mesmo com esta simplificação, os modelos apresentados, que consistem na solução da equação bidimensional para determinar o campo de velocidade axial e tangencial do escoamento desenvolvido em um espaço anular, possuem alto custo computacional. O modelo apresentado neste trabalho leva em conta a variação da excentricidade ao longo do poço, bem como o comportamento pseudoplástico da lama e a rotação do cilindro interno. As equações que governam o problema foram simplificadas utilizando a teoria de lubrificação. As equações diferenciais parciais que descrevem o perfil de velocidade e a pressão ao longo do poço foram resolvidas pelo método de diferenças finitas (diferenças centrais) e linearizadas pelo método de Newton. O modelo de lubrificação foi validado através da comparação dos resultados obtidos com trabalhos na literatura para escoamentos com excentricidade constante. Os resultados mostram o efeito da variação da excentricidade ao longo do poço, da rotação na coluna, das propriedades não Newtonianas no padrão do escoamento e no fator de atrito.
Helical flow in annular space occurs in drilling operation of oil and gas wells. The correct prediction of the flow of the drilling mud in the annular space between the wellbore wall the the drill pipe is essential to determine the variation in the mud pressure within the wellbore, the frictional pressure drop and the efficiency of the transport of the rock drill cuttings. A complete analysis of this situation is extremely complex; the inner cylinder is usualy rotating, the wellbore wall will depart significantly from cylindrical, during driling operation the drill pipe is eccentric, and the eccentricity varies with position along the well. Moreover, drilling muds present pseudoplastic behavior, the viscosity is a strong function of the deformation rate. A complete analysis of this situation would require the solution of the three-dimensional momentum equation and would be computationally expensive and complex. Models available in the literature to study this situation do consider the rotation of the inner cylinder and the non Newtonian behavior of the liquid, but assume the position of the inner and outer cilinders fixed, i.e. they neglect the variation of the eccentricity along the length of the well, and assume the flow to be well developed. This approximation leads to a two-dimensional model to determine the three components of the velocity field in a cross-section of the annulus. The resulting differential equations have to be solved by some numerical method. The model presented in this work takes into account the variation of the eccentricity along the well; a more appropriate description of the geometric configuration of directional wells. As a consequence, the velocity field varies along the well length and the resulting flow model is three-dimensional. Lubrication theory is used to simplify the governing equations into a non-linear, two-dimensional Poisson Equation that describes the pressure field. Lubrication model was validated by comparing the predictions to reported results on fully developed flow on eccentric annular space. The results show the effect of varying eccentricity, non Newtonian behavior and inner cylinder rotation on the flow field and on the friction factor.
Bremner, Sherry. "A granular flow model of an annular shear cell." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20304.
Повний текст джерелаWang, Hengliang. "Numerical study of turbulent flow in eccentric annular pipe." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6349.
Повний текст джерелаAl-Aufi, Yousuf Abdullah. "Vertical annular flow characteristics for air/silicone oil system." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49216/.
Повний текст джерелаFernelius, Mark H. "Effect of Full-Annular Pressure Pulses on Axial Turbine Performance." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3825.
Повний текст джерелаSkoog, Erik. "CFD Annular Flow Modelling Based on a Three-Field Approach." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80165.
Повний текст джерелаAgostinelli, Giulia. "Advancement of closure relations for annular flow modeling in CFD." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129364.
Повний текст джерелаCataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 118-124).
In Boiling water Reactors (BWRs), the presence of a liquid film in contact with the heated rod surface is crucial to ensure an efficient heat removal and prevent the threatening occurrence of dryout. The accurate prediction of the complex multidimensional liquid film behavior in advanced BWR fuel assemblies is critical to guarantee improved reactors performance and safety. Multiphase- CFD (M-CFD) brings the ability to model the complex three-dimensional flow structures in annular flow regime [1], while physics-based constitutive equations are needed to accurately represent the phase interactions, particularly at the liquid film interface. The development of closure relations for droplet deposition and entrainment as well as wave-induced interfacial shear, is a major priority for the modeling of annular flow in M-CFD. In annular flow conditions, liquid is continuously exchanged at the interface between the bulk steam and the film on the walls.
While liquid droplets deposit onto the film driven by turbulent diffusion, new ones are entrained from the waves appearing on the film surface. A modeling approach is proposed and assessed to represent the local subgrid-scale deposition in CFD, showing comparable results with existing integral correlations, and an average error of 30%. Available closures are also evaluated for their ability to represent entrainment in the CFD implementation. Finally, in order to drive the advancement of the representation of interfacial shear, as well as physics-based droplet entrainment, the work focuses on the analysis and modeling of disturbance waves. The recent high resolution film measurements collected by Robers [2] are analyzed and leveraged to propose a physical representation of disturbance waves, which can be implemented into a complete model.
The proposed model is successfully assessed against the experimental measurements of Sawant [3], while a large disagreement is found in comparison with the high pressure data evaluated at the RISO facility [4]. The new model predictions are consistent with existing integral correlations, demonstrating the need for further advancement of high pressure experiments with high resolution, necessary to drive more general representations. The complete set of closures is implemented in a commercial CFD software, and demonstrated adopting data from the Robers experiments. While the lingering limitations of the CFD implementation to transport thick films lead to overprediction of the local film thickness, the formulation shows promising performance towards more fundamental modeling of annular flow in M-CFD.
by Giulia Agostinelli.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Nuclear Science and Engineering
Raddino, Salvatore. "CFD modeling of annular flow with a three-field approach." Thesis, KTH, Fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214546.
Повний текст джерелаPohner, John A. "Analysis of separated, non-parallel, axisymmetric, annular two-phase flows." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/15838.
Повний текст джерелаStridh, Madeleine. "Material flow : An analysis of a production area for improved material flow." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80193.
Повний текст джерелаPan, Shunqi. "An experimental study of swirl development along the annulus between a rotor and a stator." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1407.
Повний текст джерелаTkaczyk, Piotr. "CFD simulation of annular flows through bends." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556100.
Повний текст джерелаChochua, Gocha. "Computations of gas annular damper seal flows." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000115.
Повний текст джерелаTitle from title page of source document. Document formatted into pages; contains xix, 103 p.; also contains graphics. Includes vita. Includes bibliographical references.
Donovan, William Howard. "Experimental and computational investigation of flow through an annular turbine cascade." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA302953.
Повний текст джерелаThomas, Gregory David. "Measurement and prediction of the flow through an annular turbine cascade." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA272530.
Повний текст джерелаOmurlu, Cigdem. "Mathematical Modeling Of Horizontal Two-phase Flow Through Fully Eccentric Annuli." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607243/index.pdf.
Повний текст джерелаs pressure loss estimations are within ±
30% for two different annular flow geometries.
Anghel, Ionut Gheorghe. "Experimental Study of Post-Dryout Heat Transferin Annuli with Flow Obstacles." Licentiate thesis, KTH, Reaktorteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-44071.
Повний текст джерелаQC 20111024
SKC: Post Dryout Regime
Tse, David Gar Nile. "Flow and combustion characteristics of model annular and can-type combustors." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/8941.
Повний текст джерелаBarbosa, Jader Riso. "Phase change of single component fluids and mixtures in annular flow." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/11558.
Повний текст джерела