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Dissertations / Theses on the topic 'Airflow'

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1

Seidel, Robin. "Mechanical dynamic response of airflow sensors of airflow sensors of crickets." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493806.

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Insects have evolved very elaborate sensing systems. The airflow sensors of crickets are among the most sensitive sensors in the animal world. The sensor comprises a thin hair, which protrudes from the surface of the cuticle and sits in a specialised socket. Its elliptical base is surrounded by a flexible joint membrane to allow the hair to rotate. The polarity of the base restricts the rotation of the hair to a preferred plane of movement. The results of the morphometric analysis of the airflow sensors presented in this study show that the maximal diameter of the hair is a strong predictor fo
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2

Solaymani-Kohal, Jamshid. "Airflow through horizontal openings." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294525.

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3

Jaroslawski, ML. "Airflow limitation in croup." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/26628.

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This thesis investigates a mechanism for air flow limitation in children with croup. Croup is a common condition affecting many young children. Infection (usually viral) causes swelling of the mucosa in the subglottic region of the airway with consequent narrowing of the airway. Although researchers have investigated croup for the past sixty years, there is still very little information available on how croup affects air flow dynamics. The current theory assumes that the stenosis formed by croup in the subglottis of infants leads to a dynamic collapse of the extrathoracic trachea (Chernick, 19
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4

Abedi, Milad. "Directional Airflow for HVAC Systems." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/88524.

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Directional airflow has been utilized to enable targeted air conditioning in cars and airplanes for many years, where the occupants could adjust the direction of flow. In the building sector however, HVAC systems are usually equipped with stationary diffusors that can only supply the air either in the form of diffusion or with fixed direction to the room in which they have been installed. In the present thesis, the possibility of adopting directional airflow in lieu of the conventional uniform diffusors has been investigated. The potential benefits of such a modification in control capabilitie
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5

Fung, Chak Fai. "The structure of airflow over waves." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409924.

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6

Baddock, Matthew. "Airflow dynamics in transverse dune interdunes." Thesis, University of Northampton, 2005. http://nectar.northampton.ac.uk/2994/.

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Aeolian dune interdunes have been relatively ignored when compared with the research attention on the morphodynamics of the dune bodies themselves. This neglect is in spite of the possible significance of interdune dynamics for the geomorphology of the sand dune system as a whole, especially with regard to dune spacing. This project involved the collection of geomorphologically relevant airflow data for four relatively simple transverse dune interdunes. The study locations were chosen in order to sample interdunes with different size and surface type characteristics, the dynamics of which were
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7

Rennie, Catherine. "Investigation of sinonasal airflow and transport." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23889.

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This work comprises an investigation of airflow and transport in the human upper airways, which not only perform essential air conditioning physiological functions (heat and water exchange and primary filtration) but also house the olfactory receptors. The conflicting requirements posed by efficient air transit on the one hand and sampling for olfaction on the other renders the geometry of the upper airways complex. Knowledge of the geometry and flow conditions are primary requirements for understanding the physiological mechanics of the airways. This work describes the application of imaging
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8

Bates, Alister. "Mechanics of airflow in human inhalation." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25515.

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The mechanics of airflow in the large airways during inspiration affects important physiological functions such as ventilation, olfaction, heat exchange and mass transfer. The behaviour of the airflow is important not only for healthcare applications including diagnosis, intervention planning and assessment, but for inhalation toxicology. This research aims to further the understanding of human nasal physiology through computational modelling. Specifically, the effects of transient inhalation conditions on flow dynamics and transport were characterised and the changes in flow behaviour in resp
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9

Odewole, Gboyega Akindeji. "Airflow patterns in ventilated wall cavities." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/airflow-patterns-in-ventilated-wall-cavities(f67d5b52-af96-4784-a1ac-6d6c3c41812e).html.

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Though heating, insulation, wall claddings and cavity-wall construction are considered as measures for remediating moisture and condensation in buildings, ventilation of wall cavities has however become a mantra among architects and other building professionals. Holes of any size and shape are made and located on building facades based on the accepted wisdom that a little air movement will keep the wall cavities dry. Whilst ventilation has been found to be successful in the control of moisture and condensation in rooms and larger enclosures, there is however insufficient understanding of how i
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10

Rowell, Jeffrey. "Schlieren imaging : visualization of airflow in speech." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55103.

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Schlieren imaging is a non-invasive research tool that enables real-time visualization of airflow through refraction of light. Used predominantly in aerospace and ballistics research, its suitability for observing airflow in speech was proposed nearly 40 years ago. To date, this potential has been virtually unexplored. The following proof-of-concept study investigates the visual correlates of nasal versus non-nasal airflow to provide a preliminary demonstration of the tool’s ability to visualize aerodynamic events in speech. Simultaneous schlieren and audio recordings were made of three French
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11

Louka, Petroula. "Measurements of airflow in an urban environment." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312298.

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12

Ray, Stephen D. (Stephen Douglas). "Modeling buoyancy-driven airflow in ventilation shafts." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74930.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 185-191).<br>Naturally ventilated buildings can significantly reduce the required energy for cooling and ventilating buildings by drawing in outdoor air using non-mechanical forces. Buoyancy-driven systems are common in naturally ventilated commercial buildings because of their reliable performance in multi-story buildings. Such systems rely on atria or ventilation shafts to provide a pathway for air to rise through t
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13

Xu, Weiran 1968. "New turbulence models for indoor airflow simulation." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9933.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Architecture, 1998.<br>Includes bibliographical references (p. 157-165).<br>It is important to predict indoor environment in order to design thermally comfortable and healthy indoor spaces. Heating, Ventilating and Air Conditioning (HVAC) design engineers and architects widely use the Computational Fluid Dynamics (CFD) technique for indoor environment predictions. The CFD technique requires a turbulence model to correctly calculate indoor air distribution. However, the currently available turbulence models in the literature are e
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14

Tsui, Wing Shum. "Nasal geometry and airflow dynamic in Chinese /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-bc-b23750881f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Building and Construction in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 217-263)
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15

MacFarlane, Susan Theresa. "Investigation of airflow through a compost-based biofilter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/NQ41222.pdf.

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16

Tura, R. "Heat transfer and airflow phenomena in multilouvred ducts." Thesis, Coventry University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374680.

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17

Chrystyn, H. "Pharmacodynamics of theophylline in irreversible chronic airflow obstruction." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379859.

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18

Hassan, Wajahat. "Airflow obstruction and bronchial reactivity in rheumatoid arthritis." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336812.

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19

Kurujareon, Jutarat. "Simulation of airflow in the human tracheobronchial network." Thesis, University of Hertfordshire, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391374.

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20

Ruse, Charlotte. "Genetic epidemiological studies of late onset airflow obstruction." Thesis, University of Leicester, 2003. http://hdl.handle.net/2381/29441.

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21

Corsello, Joseph William. "Laboratory simulation of subsurface airflow beneath a building." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90012.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 82-84).<br>Vapor intrusion is the vapor-phase migration of volatile organic compounds (VOCs) into buildings due to subsurface soil or groundwater contamination. Oxygen replenishment rates beneath a building are significant for quantifying potential contaminant degradation rates within the vadose zone. Additionally, the migration of VOC soil gas vapors into buildings is partly due to pressure diffe
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22

Chang, Jui-Chen 1978. "Effectiveness and performance of double-skin airflow facades." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9037.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.<br>Includes bibliographical references (p. 47).<br>Double-skin airflow facades have been in use for several years in European countries. They have yet to be used in the United States. One factor is that there is a lack of a heat transfer model which can accurately predict facade performance. A model of performance has been developed by Daniel Arons. The goal of the work presented is to verify the model with experimentation on a small-scale facade. Sunlight was simulated with a 400 W metal halide High I
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23

Black, Duncan Stuart. "The interaction between waves and an overlying airflow." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/37112.

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This dissertation examines the interaction between a series of progressive gravity waves and an overlying airflow. A critical review of the existing literature is made, from which it is concluded that although a large number of wind-wave interactions have been proposed, few have been verified experimentally. Furthermore, virtually no consideration has been given to the effect of the airflow on the underlying wave motion. A comprehensive experimental investigation of the interaction between wind and waves has therefore been undertaken. In respect of the airflow, a complete set of kinematics mea
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24

Stoakes, Preston John. "Simulation of Airflow and Heat Transfer in Buildings." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35690.

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Energy usage in buildings has become a major topic of research in the past decade, driven by the increased cost of energy. Designing buildings to use less energy has become more important, and the ability to analyze buildings before construction can save money in design changes. Computational fluid dynamics (CFD) has been explored as a means of analyzing energy usage and thermal comfort in buildings. Existing research has been focused on simple buildings without much application to real buildings. The current study attempts to expand the research to entire buildings by modeling two existin
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25

Aghil, Salah Salem. "Characterisation of the internal aerodynamics of passenger compartments." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366476.

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26

Wiggs, Barry James Ryder. "Modeling the resistance to airflow in the human lung." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27748.

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To examine the influence of airway smooth muscle shortening and airway wall thickness on pulmonary resistance a model of the tracheobronchial tree has been developed which allows simulations of these mechanisms of airway narrowing. The model is based on both a symmetrical branching system proposed by Weibel (61) and an asymmetric branching scheme developed by Horsfield(21). Fluid mechanic equations proposed by Pedley (49) are used to calculate inspiratory resistance and to allow for changes in lung inflation the pressure area curves described by Lambert(32) are used. The model is easily implem
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27

Morris, Jackson Alexander. "Application of Shark Skin Flow Control Techniques to Airflow." Thesis, The University of Alabama, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10638677.

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<p> Due to millions of years of evolution, sharks have evolved to become quick and efficient ocean apex predators. Shark skin is made up of millions of microscopic scales, or denticles, that are approximately 0.2 mm in size. Scales located on the shark&rsquo;s body where separation control is paramount (such as behind the gills or the trailing edge of the pectoral fin) are capable of bristling. These scales are hypothesized to act as a flow control mechanism capable of being passively actuated by reversed flow. It is believed that shark scales are strategically sized to interact with the lower
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28

Yazdanpanah, Fahimeh. "Permeability of bulk wood pellets with respect to airflow." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/15231.

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Data on the resistance of wood pellets to air flow are required for the design and control of ventilation and drying of bulk pellets in storage. In this study, pressure drops versus air flows were measured for several sizes of wood pellets, with diameter of 6 mm and lengths varying from 4 to 34 mm. Air flow rates ranging from 0.014 to 0.80 m s⁻¹ were used in the experiment. The maximum pressure drop measured was 2550 Pa m⁻¹. Three predictive models - Shedd, Hukill-Ives, and Ergun equations that relate pressure drop to air flow in bulk granular materials were used to analyze the data. The Ergun
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29

Moloney, Kenneth W. "An analysis of airflow patterns in auxiliary ventilated drivages." Thesis, University of Nottingham, 1997. http://eprints.nottingham.ac.uk/12364/.

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In recent years the drivage advance rates achieved within the UK coal industry have increased. In the 1980's average drivage rates were 35m per week compared to the 100/150m per week possible today. These extended rates of advance have resulted in an increase in the potential methane, dust and heat generation within the vicinity of the drivage face. In order to effectively disperse this additional pollutant load a controlled increase in air quantity is required. Although advance rates have changed, current auxiliary ventilation practice has not. UK mining law requires that the fresh air must b
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30

Lu, Weizhen. "Modelling of airflow and aerosol particle movement in buildings." Thesis, De Montfort University, 1995. http://hdl.handle.net/2086/4273.

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31

Al-Maskari, Juma. "Processes of convection and airflow over the Hajar Mountains." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432311.

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32

Church, Sally Georgina. "On the measurement of airflow obstruction in conscious man." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309143.

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33

Nayebossadri, Shahrzad. "Computational and experimental study of nasal cavity airflow dynamics." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8611.

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This work aims to assess human nasal blockage by investigating its influence on nasal airflow dynamics, both computationally and experimentally. An in-house CFD code (Lithium) computes the steady (mean) nasal airflow for a cavity constructed from CT images of a healthy adult, for the internal cavity and for the first time for the external flow. To account for turbulence occurrence, the low Reynolds number k-ω Reynolds-Averaged-Navier-Stokes (RANS) model is used. The flow field is calculated at different breathing rates by varying the influx rate. Blockages are introduced at various locations i
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34

Smyth, Thomas Andrew George. "Airflow and sediment transport dynamics in coastal dune blowouts." Thesis, Ulster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646398.

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Blowouts are erosional depressions that occur on pre-existing vegetated sand deposits. Their morphodynamic behaviour can reflect changes in anthropogenic activity, climatic conditions and animal behaviour; however patterns of deflation are poorly understood as near-surface airflow is complex. Previous research has indicated that flow is topographically manipulated as it moves through the landform, causing steering, reversal and jetting of the airflow. However, empirical data on these effects have been limited due to inadequacies in anemometer and sediment trap deployments. As a consequence kno
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35

Zhang, Qin Ph D. Massachusetts Institute of Technology. "Modeling and characterizing bi-directional airflow in natural ventilation." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106427.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Architecture, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 98-105).<br>Bi-directional airflow in natural ventilation is an essential but not-well-understood scenario due to the complexity of airflow patterns as well as the strong coupling effect between temperature and ventilation. Neglecting bi-directional natural ventilation will result in problematic solutions and inaccuracy in estimation of ventilation performance. This work is focused on filling the knowledge gap by understan
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36

Tukur, Ahmed Gidado. "Reducing Airflow Energy Use in Multiple Zone VAV Systems." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1467872641.

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37

Felgner, Felix. "Design of virtual airflow sensors for thermal comfort control." Aachen Shaker, 2008. http://d-nb.info/992052807/04.

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38

Landolt, Scott David. "An analysis of airflow patterns inside precipitation gauge shielding." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453573.

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39

Testa, Samuele. "Airflow fields analysis in bounded domains with CFD methods." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423590.

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In the current work the focus is on natural ventilation occurring in buildings. The first step is to discuss the potential of numerical models applied to determine building performance and air flow as part of a mixed mode building control scheme with respect to a test case. A dynamic simulation software (TRNSYS) is used to estimate the annual energy demand. An optimization program (GenOpt) changes iteratively the parameters regulating the airflow within the building model in order to minimize the whole year energy use. Elements which are considered in the analysis are outdoor climatic conditio
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40

Ren, Zhengen. "Enhanced modelling of indoor air flows, temperatures, pollutant emission and dispersion by nesting sub-zones within a multizone model." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269182.

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41

Vlachos, Bill Vaseleos. "Effect of shear layer modelling on the simulated flow in a cavity." Thesis, University of Hertfordshire, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369760.

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42

Wakefield, Nigel Hugh. "Helicopter flight in the airwake of non-aviation ships." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326729.

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43

Mealing, B. E. "Flow in a forward swept centrifugal fan." Thesis, Cranfield University, 1988. http://dspace.lib.cranfield.ac.uk/handle/1826/10333.

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The original objective of this work, to improve the efficiency of a forward curved centrifugal fan, was redirected to the urgent solution of a serious impeller life problem arising under certain service conditions. Using a variety of experimental and theoretical techniques the flow pattern within the blade passage was analysed and the cause of the problem diagnosed. A new impeller has been designed and has been found to solve the service life problem while also yielding an improvement in efficiency. Because the project was carried out under the Total Technology programme the scope was widened
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44

Lin, Yi. "POMA : a zonal model for airflow and temperature distribution analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ43649.pdf.

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45

Rosman-Meijer, Geertruida Gerarda. "Epidemiology and exogenous factors in nocturnal airflow limitation in children." [Groningen] : [Groningen] : Rijksuniversiteit Groningen ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/149017367.

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46

Hitchcock, Kathryn Elizabeth. "A novel airflow control valve for use in medical applications." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1570.

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Thesis (M.S.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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47

Barakat, Magdi H. "Computation of indoor airflow for thermal comfort in residential buildings." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/23308.

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48

Lindberg, Therese. "Modelling and Evaluation of Distributed Airflow Control in Data Centers." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36479.

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In this work a suggested method to reduce the energy consumption of the cooling system in a data center is modelled and evaluated. Introduced is different approaches to distributed airflow control, in which different amounts of airflow can be supplied in different parts of the data center (instead of an even airflow distribution). Two different kinds of distributed airflow control are compared to a traditional approach without airflow control. The difference between the two control approaches being the type of server rack used, either traditional ones or a new kind of rack with vertically plac
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49

Leonard, Henry J. "Control of airflow and fuel injection parameters in diesel engines." Thesis, University of Bath, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760591.

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50

Menchaca, Brandan María Alejandra. "Study of airflow and thermal stratification in naturally ventilated rooms." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74907.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 253-257).<br>Natural ventilation (NV) can considerably contribute to reducing the cooling energy consumption of a building and increase occupant productivity, if correctly implemented. Such energy savings depend on the number of hours that NV can maintain the indoor air temperature within comfort levels. CoolVent, currently the only simple multizone simulation tool that can adequately model the physics of NV in buildi
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