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Dissertations / Theses on the topic 'Annual flow'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

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.

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2

Lam, 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.

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3

O, 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.

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1. Higher Mathematics: manual. Theory of Probability and Elements of Mathematical Statistics / V.P. Denisiuk, V.M. Bobkov, L.A. Grishina – K.: NAU, 2013. 210-216 pages. 2. Пасажиропотік аеропортів України [Electronic source] - https://www.wikiwand.com/uk/Пасажиропотік_аеропортів_України/Загальний_пасажиропотік_аеропортів_України. 3. Валовой внутренний продукт (ВВП) в Украине 2021[Electronic source] -https://index.minfin.com.ua/economy/gdp/<br>In many problems of physics, economics, medicine, engineering, etc. we have to experimentally study the dependence of a random variable Y, observed, on

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4

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.

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Prediction of flow is necessary for planning and management of water resources. The objective of this study is to estimate mean annual flows for the USA and mean monthly flows for the rivers of central Texas based on the precipitation and their watershed characteristics. Flow varies largely with topographic and climatic parameters and hence generalization of runoff models is difficult. This model aims at providing a prediction at ungaged locations with very few parameters that are easily available and measurable. Scatter in predicted data will be seen at the annual and monthly time scale in

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5

Guo, Zhenyi. "CFD Simulation of Annular Flow Boiling in Microchannels." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14428.

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Flow boiling in microchannels has received enormous interest over the past few decades because of its importance in the thermal management of micro-structured devices. Few of previously published studies focus specifically on microchannel annular flow boiling which is very important due to its prevalence in this system. This thesis provides understanding of the heat and mass transfer in microchannel annular flow boiling via the use of a computational fluid dynamics (CFD) approach. The commercial software ANSYS Fluent was chosen to perform the CFD simulations. A modified height function (HF) me

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6

Meyer, 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.

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Ce travail a eu pour but premier d’étudier le risque d’évolution de la résistance aux herbicides inhibiteurs de l’acétolactate synthase (ALS) chez l’ambroisie à feuilles d’armoise (Ambrosia artemisiifolia L.) à travers quatre points : (i) la pression de sélection (étude de l’efficacité d’une gamme d'herbicides inhibiteurs de l’ALS), (ii) la capacité de réponse adaptative de l’adventice (détermination de la variation de la sensibilité aux inhibiteurs de l’ALS entre plantes et mise en place d’un programme de sélection récurrente), (iii) une étude de terrain (recherche de résistance aux inhibiteu

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7

Al-Yarubi, Qahtan. "Phase flow rate measurements of annular flows." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/9104/.

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In the international oil and gas industry multiphase annular flow in pipelines and wells is extremely important, but not well understood. This thesis reports the development of an efficient and cheap method for measuring the phase flow rates in two phase annular and annular mist flow, in which the liquid phase is electrically conducting, using ultrasonic and conductance techniques. The method measures changes in the conductance of the liquid film formed during annular flow and uses these to calculate the volumetric and mass flow rates of the liquid film. The gas velocity in the core of the ann

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8

Mekanik, 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.

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The aim of this Thesis is to obtain time-accurate solutions of the Navier-Stokes equations for laminar incompressible unsteady flows generated by oscillating boundaries in an annular region made from two concentric cylinders. For this, a time-dependent coordinate transformation is first used to obtain a fixed computational domain. The resulting governing equations in the fixed domain are discretized in real time based on a three-time-level implicit scheme. A pseudo-time integration with artificial compressibility is then used to reduce the resulting coupled discretized equations in delta form

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9

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.

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This thesis presents the results of the investigations in two areas, i.e. non-Newtonian annular flow and cuttings transport in drilling annuli at various angles. In the first part of the thesis, a review of the fundamentals and the previous studies on laminar concentric annular flow of non-Newtonian fluids is given at first. Then two parallel theoretical studies are performed, respectively, on: a. Laminar eccentric annular flow of power-law and Bingham plastic fluids. In this analysis, a new method is used which treats an eccentric annulus as infinite number of concentric annuli with variable

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10

Hawkes, Neil. "Wispy-annular flow." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/12043.

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11

Jedwab, M. R. "Flow in annular diffusers." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233255.

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An experimental study was performed to investigate the mechanics of fluid flow in a 30<SUP>o</SUP> annular diffuser, and to study the periodicity of flow oscillations in this region. Surface oil-flow patterns and smoke-flow visualisation experiments were performed with a centrebody concentric and eccentric in the diffuser. Above a threshold offset, the measurements revealed two contra-rotating periodic vortices in antiphase with each other, symmetrically disposed about the plane of minimum clearance in the annulus, and originating in the 30<SUP>o</SUP> diffuser. Steady pressure measurements in

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12

Wang, 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.

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13

Dillon, Chad Michael. "Two-Phase Flow Within Narrow Annuli." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5097.

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A study of two-phase flow in annular channels with annular gaps of less than 1 mm is useful for the design and safety analysis of high power density systems such as accelerator targets and nuclear reactor cores. Though much work has been done on pressure drop in two-phase flow, designers rely mostly on empirical models and correlations; hence, it is valuable to study their applicability for different channel sizes, geometries, and gas qualities. The pressure drop along a concentric annular test section was measured for cases of either constant quality or variable quality along its length (

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14

Wolf, Arne. "Film structure of vertical annular flow." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/8178.

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15

Badie, Shahrokh. "Horizontal stratifying annular gas liquid flow." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249385.

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16

McQuillan, K. W. "Flooding in annular two-phase flow." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354843.

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17

Willetts, I. P. "Non-aqueous annular two-phase flow." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393120.

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18

Flores, Aaron G. (Aaron Guerrero). "Dryout limits in horizontal annular flow." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12872.

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19

Teixeira, 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.

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The structure of turbulent flow in vertical upwards annular air water two-phase flow was examined. Experiments were carried out in a 32 mm internal diameter tube using laser Doppler anemometry. Simultaneous measurements of the two velocity components and the Reynolds stress were obtained by the use of two colours (blue and green) of a 50 mW argon ion laser. The gas core was seeded by polystyrene particles of 1 um diameter which were believed to follow the gas turbulent fluctuations. The characteristics of the signal were used to discriminate these tracer particles from the water droplets. The

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20

Shlyubsky, 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.

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The annular-return flow and the utility of small-scale, combustion-based actuators for its control are investigated experimentally. The annular return flow is generated by an axial primary round jet, which impinges normally on a bounded end wall of a concentric tube, subsequently reverses direction, and exits the tube in a countercurrent flow to the primary jet. The combustion-based actuator generates a momentary (pulsed) jet that is produced by the ignition of a mixture of gaseous fuel and oxidizer in a small (cubic centimeter scale) combustion chamber. The operating frequency and the phase c

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21

Mohri, K. "Supersonic flow over rectangular-section annular cavities." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501753.

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22

Ekberg, Nathanial Paul. "Two-phase flow in horizontal thin annuli." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17250.

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23

Yapici, Sinan. "Electrochemical mass transfer in annular swirl flow." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303777.

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24

Blasick, Ann Marie. "Onset of flow instability in heated horizontal annuli." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19538.

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25

Jepson, 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.

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26

Qiu, 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.

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27

Lorenz, 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.

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28

Mohapatra, 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.

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29

Curran, 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.

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30

Altunbas, 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.

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31

Chong, 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.

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32

TARAZONA, 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.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O 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;

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33

Bremner, Sherry. "A granular flow model of an annular shear cell." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20304.

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Machinery such as an IsaMillTM used in communition to produce fine particle sizes that allow minerals to be extracted are best modelled using granular flows. A single rheological description that captures all the features of granular flows has not yet been realised, although considerable progress towards a complete theory has been made. Existing models of such horizontally stirred mills are empirical, tend to be extremely dependent on boundary conditions and do not allow for confident extrapolation beyond their window of design. As a first step to understanding the dynamics inside the IsaMill

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34

Wang, Hengliang. "Numerical study of turbulent flow in eccentric annular pipe." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6349.

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An eccentric annular duct is a prototype element in many applications, for example in close-packed tubular heat exchangers and coolant channels of nuclear reactors. From a fundamental viewpoint, turbulent flow in eccentric annular ducts is an ideal model for investigating inhomogeneous turbulence. It is also a convenient model to study the laminar and turbulent interface and may serve as a test case for turbulence modelling of flows with partly turbulent regimes. Based on the approach of direct numerical simulation, numerical investigations of turbulent flow in eccentric annular pipes are carr

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35

Al-Aufi, Yousuf Abdullah. "Vertical annular flow characteristics for air/silicone oil system." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49216/.

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Annular flow is one of the most common two-phase flow regimes observed in industrial applications. In annular flow, the liquid flows partly as a thin film along the pipe wall and partly as droplets entrained in the turbulent gas core. Most of the previous studies about the characteristics of annular flow and the developed correlations were conducted using an air/water system. This thesis reports an investigation about the characteristics of the annular flow regime and a development of liquid film thickness measurement using an ultrasonic technique in air/water and air/silicone oil systems. Exp

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36

Fernelius, Mark H. "Effect of Full-Annular Pressure Pulses on Axial Turbine Performance." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3825.

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Pulse detonation engines show potential to increase the efficiency of conventional gas turbine engines if used in place of the steady combustor. However, since the interaction of pressure pulses with the turbine is not yet well understood, a rig was built to compare steady flow with pulsing flow. Compressed air is used in place of combustion gases and pressure pulses are created by rotating a ball valve with a motor. This work accomplishes two main objectives that are different from previous research in this area. First, steady flow through an axial turbine is compared with full annular pulsed

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37

Skoog, 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.

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This master thesis aim to model the annular flow that occurs in the final section between the fuel rods inside Boiling Water Reactors, by approximating the geometry to a cylindrical pipe. Simulations were performed in the software ANSYS Fluent, as a step in the development of replacing the 1D correlations currently used in the nuclear industry with CFD models in 3D. An Eulerian-Lagrangian approach was used for the three fields of steam, liquid film and liquid droplets in the model. Entrainment was modeled based on 1D correlations from Okawa [7] and deposition with the built in Discrete Phase M

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38

Agostinelli, Giulia. "Advancement of closure relations for annular flow modeling in CFD." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129364.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, September, 2020<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 118-124).<br>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

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39

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.

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40

Pohner, John A. "Analysis of separated, non-parallel, axisymmetric, annular two-phase flows." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/15838.

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41

Stridh, 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.

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Focus in the world today is quality and customer orientation. An organization needs to understand the concept of value from the perspective of a customer in order to keep up with expectations on quality, and the turbulent and global environment of today characterized by rapidly changing conditions. This master thesis project was conducted at ABB in Sweden during spring 2020. It is essential for ABB to have an ongoing focus on improvement to maintain a successful organization and enable a competitive future of quality and innovation. The aim of this project was to identify ways to improve mater

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42

Pan, 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.

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43

Tkaczyk, Piotr. "CFD simulation of annular flows through bends." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556100.

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There is particular interest in the oil industry, in gas/liquid distribution in pipe line systems. The presence of bends has a significant effect on gas/liquid flows. Bends are often necessary to fit the equipment into limited spaces e.g. in plants or on oil rig platforms. As part of designing industrial systems, it is therefore important to be able to understand how liquid and gas move around bends. The aim of this research is to develop a method for predicting gas/liquid annular flows. A 3D CFD-based method is therefore developed to solve for annular flows in pipes and is applied to a range

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44

Chochua, Gocha. "Computations of gas annular damper seal flows." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1000115.

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Thesis (Ph. D.)--University of Florida, 2002.<br>Title from title page of source document. Document formatted into pages; contains xix, 103 p.; also contains graphics. Includes vita. Includes bibliographical references.

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45

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.

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46

Thomas, 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.

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47

Omurlu, 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.

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iv The primary objective of this study is to understand the mechanism, the hydraulics and the characteristics, of the two-phase flow in horizontal annuli. While achieving this goal, both theoretical and experimental works have been conducted extensively. The METU-PETE-CTMFL (Middle East Technical University, Petroleum and Natural Gas Engineering Department, Cuttings Transport and Multiphase Flow Laboratory) multiphase flow loop consists of 4.84 m long eccentric horizontal acrylic pipes having 0.1143m inner diameter (I.D) acrylic casing - 0.0571m outer diameter (O.D) drillpipe and 0.0932m I.D a

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48

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.

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An experimental study on post dryout heat transfer regime in annuli with flow obstacles was conducted in the High-pressure Water Test (HWAT) loop at the Royal Institute of Technology in Stockholm, Sweden. An annulus consisting of two concentric heated pipes (12.7x24.3) mm, with total heated length equal to 3650 mm was employed as a test section. Three kinds of flow obstacles were used: pin-spacers, cylindrical obstacles and grid obstacles. The experiments performed in the test section with pin-spacers only were considered as the reference case. In two consecutive sets of runs, additional obsta

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49

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.

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50

Barbosa, 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.

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This thesis is dedicated to the study of flow boiling of single component fluids and multicomponent mixtures in vertical pipes at high qualities. Both theoretical and experimental investigations were carried out with the objective of improving fundamental knowledge of hydrodynamics and phase change heat transfer in annular flow. The diabatic experiments had the objective of studying the nature of nucleate boiling in upward steam-water annular flow. A specially constructed, electrically heated, annulus visualisation test section (deq = 12.9 mm) was used to observe directly the interaction betwe

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