Дисертації з теми "Boundary heat flux"
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Vega, Thomas. "Quantification of the Fire Thermal Boundary Condition." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/78052.
Повний текст джерелаMaster of Science
Kharche, Sanjay. "Stefan problems with two-dimensional, linearised perturbations in their boundary geometry or boundary conditions." Thesis, University of Hull, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327179.
Повний текст джерелаSchmid, Hans Peter Emil. "Spatial scales of sensible heat flux variability : representativeness of flux measurements and surface layer structure over suburban terrain." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29385.
Повний текст джерелаArts, Faculty of
Geography, Department of
Graduate
Magee, Michael P. "Thermal boundary resistance in a high temperature thin-film superconductor under varying heat flux." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA326312.
Повний текст джерела"December 1996." Thesis advisor(s): Matthew Kelleher, Pat E. Phelan. Includes bibliographical references (p. 73-75). Also available online.
Sahlée, Erik. "Fluxes of Sensible and Latent Heat and Carbon Dioxide in the Marine Atmospheric Boundary Layer." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8184.
Повний текст джерелаOceans cover about 70% of the earth’s surface. They are the largest source of the atmospheric water vapour and act as enormous heat reservoirs. Thus in order to predict the future weather and climate it is of great importance to understand the processes governing the exchange of water vapour and heat between the ocean and atmosphere. This exchange is to a large extent mediated by turbulent eddies. Current numerical climate and weather forecast models are unable to resolve the turbulence, which means that the turbulent exchange needs to be simplified by using parameterizations.
Tower based measurements at the Östergarnsholm Island in the Baltic Sea have been used to study the air-sea turbulent exchange of latent and sensible heat and the heat flux parameterizations. Although the measurements are made at an island, data obtained at this site is shown to represent open ocean conditions during most situations for winds coming from the east-south sector. It is found that during conditions with small air-sea temperature differences and wind speeds above 10 m s-1, the structure of the turbulence is re-organized. Drier and colder air from aloft is transported to the surface by detached eddies, which considerably enhance the turbulent heat fluxes. The fluxes where observed to be much larger than predicted by current state-of-the-art parameterizations. The turbulence regime during these conditions is termed the Unstable Very Close to Neutral Regime, the UVCN-regime.
The global increase of the latent and sensible heat fluxes due to the UVCN-regime is calculated to 2.4 W m-2 and 0.8 W m-2 respectively. This is comparable to the current increase of the radiative forcing due to anthropogenic emissions of greenhouse gases, reported in Intergovernmental Panel on Climate Change fourth assessment report (IPCC AR4). Thus the UVCN-effect could have a significant influence when predicting the future weather and climate.
Lindgren, Kristina. "The Behaviour of the Latent Heat Exchange Coefficient in the Stable Marine Boundary Layer." Thesis, Uppsala University, Department of Earth Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9140.
Повний текст джерелаKnowledge of the turbulent fluxes at the sea surface is important for understanding the interaction between atmosphere and ocean. With better knowledge, improvements in the estimation of the heat exchange coefficients can be made and hence models are able to predict the weather and future climate with higher accuracy.
The exchange coefficients of latent and sensible heat during stable stratification vary in the literature. Therefore it is necessary to investigate the processes influencing the air-sea exchange of water vapour and heat in order to estimate these values. With measurements from a tower and a directional waverider buoy at the site Östergarnsholm in the Baltic Sea, data used in this study have been sampled from the years 2005-2007. This site represents open-ocean conditions during most situations when the wind comes from the south-east sector. The neutral exchange coefficients, CEN and CHN, have been calculated along with the non-dimensional profile functions for temperature and wind to study the dependence of stability and other parameters of relevance.
It was found that CEN increased slightly with wind speed and reached a mean value of approximately 1.45×10-3. The highest values of CEN were observed during near neutral conditions and low wave ages. CHN attained a mean value of approximately 0.77×10-3 and did not show any relation to wind speed or to wave age. No significant dependence with wind or wave direction could be shown for either CEN or CHN in the sector 80-220°. The stability correction, performed to reduce the dependence on stratification for CEN and CHN, was well performed for stabilities higher than 0.15. The stability is represented by a relationship between the height and the Obukhov-length (z/L).
Validity of the non-dimensional profile functions for temperature and wind showed that, for smaller stabilities, these functions gave higher values than the corresponding functions recommended by Högström (1996). The profile funtions for temperature was shown to have a larger scatter while the profile functions for wind was less scattered and deviated more from the functions given by Högström
Kunskap om turbulenta flöden i det marina gränsskiktet är viktigt för att förstå växelverkan mellan atmosfär och hav. Med bättre kunskap kan förbättringar i bestämningen av utbyteskoefficienterna för latent och sensibelt värme erhållas. Det medför att modeller kan prognostisera väder och framtida klimat med högre noggrannhet.
Utbyteskoefficienterna för latent och sensibelt värme har för stabil skiktning olika värden i litteraturen. Detta gör det nödvändigt att undersöka de processer som påverkar utbytet av vattenånga och värme mellan luft och hav för att kunna bestämma dessa värden. Data som har använts i den här studien insamlades mellan år 2005 och 2007 från en boj och ett torn vid mätplatsen Östergarnsholm i Baltiska havet. För det flesta situationer, när vinden blåser från syd-ost, representerar mätplatsen ett förhållande likvärdigt det över öppet hav. De neutrala utbyteskoefficienterna, CEN och CHN, och de dimensionslösa profilfunktionera för temperatur och vind, och , har beräknats för att studera beroendet av stabilitet samt andra relevanta parametrar.
Beräkningarna visade att CEN ökade något med vindhastighet och hamnade på ett medelvärde av ungefär 1.45×10-3. De högsta värdena på CEN observerades vid nära neutrala förhållanden och låga vågåldrar. CHN uppmättes till att ha ett medelvärde på ungefär 0.77×10-3 och uppvisade inget beroende med vindhastighet eller vågålder. Inget märkbart beroende med vind- eller vågriktning kunde visas för CEN eller CHN i sektorn 80-220°. Stabilitetskorrektionen, utförd för att reducera beroendet av atmosfärens skiktning för CEN och CHN, var bra för stabiliteter högre än 0.15. Stabiliteten representeras av förhållandet mellan höjden och Obukhov-längden (z/L).
Utvärdering av de dimensionslösa funktionerna för temperatur och vind visade att dessa funktioner, för små stabiliteter, gav högre värden än motsvarande funktioner som rekommenderas av Högström (1996). Värdena på profilfunktionerna för temperatur hade större spridning än värdena på profilfunktionerna för vind och avvek mer från funktionerna givna av Högström.
Moosbrugger, John C. "Numerical computation of metal/mold boundary heat flux in sand castings using a finite element enthalpy model." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/16365.
Повний текст джерелаBrunner, Daniel Frederic. "Development of probes for assessment of ion heat transport and sheath heat flux in the boundary of the Alcator C-Mod Tokamak." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/86420.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis. Pages [228-229] blank.
Includes bibliographical references.
Progress towards a viable fusion reactor will require comprehensive understanding of boundary plasma physics. Knowledge in this area has been growing, yet there are critical gaps. Measurements of the sheath heat flux transmission coefficient-a fundamental physical quantity whose theoretical value is ~ 7-have varied from 2 to 20. Values below 5 are physically impossible and have challenged the understanding of this very basic theory. In addition, measurements of ion temperature are sparse and ion energy transport is poorly understood. To this end a set of new diagnostics, including a surface thermocouple, ion sensitive probe, and retarding field analyzer, have been developed that can tolerate the extreme heat fluxes in the Alcator C-Mod boundary plasma. These probes are used to asses issues of heat flux and ion energy transport. Systematic studies with these new tools reveal the following: A comparison of surface thermocouples and Langmuir probes confirms standard sheath heat flux theory in a tokamak for the first time. The measurement of unphysically low sheath heat flux transmission coefficients and an anomalous increase in measured divertor pressure by Langmuir probes, which is also unphysical, are found the be linked. Plasma-neutral simulations indicate that these artifacts are due to the Langmuir probe bias modifying the local plasma. Important space charge limits to measurements with ion sensitive probes are found experimentally and explored in depth with a 1D kinetic simulation. These results clarify the plasma conditions under which an ion sensitive probe may be used to measure ion temperature and/or plasma potential. The retarding field analyzer is demonstrated to be a viable ion temperature diagnostic up to the last closed flux surface in C-Mod. A ₁D fluid simulations is built to interpret edge ion heat transport. At high collisionality-where the fluid approximations are valid: the simulation reproduces the measured edge ion-to-electron temperature ratio (~ 2). However, at low collisionality-where fluid approximation is not valid-the simulation is not able to reproduce the experimental temperature ratio (~ 4). The addition of kinetic heat flux limiters can bring the simulated ratio into agreement with measurements. The value of heat flux limiter is found to be consistent with that expected from kinetic theory.
by Daniel Frederic Brunner.
Ph. D.
Nilsson, Erik. "Flux Attenuation due to Sensor Displacement over Sea." Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8024.
Повний текст джерелаIn this study the flux attenuation due to sensor displacement has been investigated over sea using an extensive set of data from the "Ocean Horizontal Array Turbulence Study". All previous investigations of the flux attenuation have been performed over land.
A function developed for correcting fluxes in the homogenous surface layer was compared to measured flux attenuation. This investigation revealed the possibility to find new functions describing the flux attenuation when measurements are carried out over sea. From the measured flux attenuation studied here a change in the form of correction functions was required to improve the estimated flux loss. The most significant difference found in this report compared to the previous landbased study Horst (2006) is for stable conditions, where significantly less flux loss is found over sea. Two new functions describing the attenuation due to sensor displacement over sea have been constructed.
One of these expressions has a discontinuity at z/L = 0. This is supported by measured flux attenuation. A reasonable interpretation is; however, that this discontinuity is caused by two separate turbulence regimes near neutrality on the stable and unstable side respectively. The discontinuity is thus not believed to be an effect merely of stability. A second correction function which is continuous over all stabilities has therefore also been constructed. These two functions and the correction function from Horst (2006) have been compared to measured flux loss. Based on this comparison the continuous correction function is recommended for correcting scalar fluxes measured over sea. It should be noted, however, that this expression only describes the mean attenuation and has been constructed from measurements at 5 and 5.5 m above mean sea level.
The theoretical basis used in the development of the function for flux attenuation over land allows for a direct link between a spectral shape and the attenuation expression. This link has been preserved for the new expressions presented in this report. The spectral shape corresponding to the continuous correction function has been compared to measured mean cospectra and also to the cospectra from Horst (2006) corresponding to crosswind displacements.
At a height of 10 m and a sensor displacement of 0.2 m the mean flux attenuation is about 1.3-4% in the stability interval −1 < z/L < 1.5 when using the new correction functions presented in this report.
Lammert, Andrea, and Armin Raabe. "Berechnung sensibler Wärmeströme mit der Surface Renewal Analysis und der Eddy - Korrelations - Methode." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-215495.
Повний текст джерелаThe Surface Renewal Analysis was used to estimate the sensible heat flux density in the ground near area of the boundary layer. The results were compared with eddy correlation method. For it both methods were used to analyse temperature- and vertical velocity-data, which were simulated by the application of structure functions. Time series of high frequency temperature- and vertical velocity-data over two different canopies (meadow and dune) were measured to examine the results. The data were analysed with surface renewal analysis and eddy correlation
北村, 圭一, Keiichi KITAMURA, 佳朗 中村 та Yoshiaki NAKAMURA. "極超音速衝撃波干渉流れにおける空力加熱の数値解析". 日本航空宇宙学会, 2008. http://hdl.handle.net/2237/13871.
Повний текст джерелаCarlsson, Björn. "Implementation and Analysis of Air-Sea Exchange Processes in Atmosphere and Ocean Modelling." Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9520.
Повний текст джерелаLammert, Andrea, and Armin Raabe. "Berechnung sensibler Wärmeströme mit der Surface Renewal Analysis und der Eddy - Korrelations - Methode." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 17 = Meteorologische Arbeiten aus Leipzig ; 5 (2000), S. 127-138, 2000. https://ul.qucosa.de/id/qucosa%3A15159.
Повний текст джерелаThe Surface Renewal Analysis was used to estimate the sensible heat flux density in the ground near area of the boundary layer. The results were compared with eddy correlation method. For it both methods were used to analyse temperature- and vertical velocity-data, which were simulated by the application of structure functions. Time series of high frequency temperature- and vertical velocity-data over two different canopies (meadow and dune) were measured to examine the results. The data were analysed with surface renewal analysis and eddy correlation.
AL-AZMI, BADER SHABEEB. "ANALYSIS OF TRANSPORT MODELS AND COMPUTATION ALGORITHMS FOR FLOW THROUGH POROUS MEDIA." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1051059625.
Повний текст джерелаGroters, Douglas J. "The temporal and spatial variability of the marine atmospheric boundary layer and its effect on electromagnetic propagation in and around the Greenland Sea marginal ice zone." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23422.
Повний текст джерелаVariability of the MABL and its effect on the electromagnetic (EM) refractive structure around the Greenland Sea marginal ice zone were examined. Rawinsonde profiles and surface observations collected from 3 ships during MIZEX-87(20 March-11 April) served as the data set. A program, developed to calculate the refractivity at each vertical level of the rawinsonde profiles, also identified the levels at which trapping, superrefraction and subrefraction occurred. Temporal studies showed that a higher incidence of anomalous refractive layers occurred during periods when the region was under the influence of high pressure. More than 50% of the time, trapping and super-refractive layers were attributed to development of a capping inversion just above the MABL during these periods. Spatial studies showed that the refractive structure varied relative to distance from the ice edge as did the depth of the MABL. An upward slope in refractive layer heights was observed from the ice toward the open water. Significant spatial inhomogeneity was observed over horizontal ranges of less than 100 km. This was attributed to both the large-scale synoptic forcing affecting the region and to variations in the surface fluxes of heat and moisture over the ice and over the water. A range-dependent ray trace model developed at the Naval Ocean Systems Center was used to show how the ray paths of EM waves vary with a changing refractive structures. Keywords: Air water interactions, Greenland Sea, Atmospheric refraction, Electromagnetic wave propagation, Heat flux, Sea ice. Theses. (EDC)
http://archive.org/details/temporalspatialv00grot
Lieutenant, United States Navy
Domingues, Catia Motta, and Catia Domingues@csiro au. "Kinematics and Heat Budget of the Leeuwin Current." Flinders University. SOCPES, 2006. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20060612.211358.
Повний текст джерелаHennon, Paula Ann. "The role of the ocean in convective burst initiation: implications for tropical cyclone intensification." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135914268.
Повний текст джерелаMaluk, Cristian. "Development and application of a novel test method for studying the fire behaviour of CFRP prestressed concrete structural elements." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/15926.
Повний текст джерела西野, 敦洋, Atsuhiro NISHINO, 尊史 石川, Takahumi ISHIKAWA, 圭一 北村, Keiichi KITAMURA, 佳朗 中村 та Yoshiaki NAKAMURA. "極超音速TSTO空力干渉流れ場における2物体間隔の空力加熱率への影響". 日本航空宇宙学会, 2005. http://hdl.handle.net/2237/13879.
Повний текст джерелаSaid, Frédérique. "Etude expérimentale de la couche limite marine : structure turbulente et flux de la surface (expérience TOXANE-T)." Toulouse 3, 1988. http://www.theses.fr/1988TOU30022.
Повний текст джерелаFarias, Priscila Cavalheiro. "FLUXOS DE CALOR E DIÓXIDO DE CARBONO ENTRE O OCEANO E A ATMOSFERA NA REGIÃO COSTEIRA E OCEÂNICA AO SUL DO BRASIL." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/10280.
Повний текст джерелаO Oceano Atlântico Sudoeste é caracterizado, no inverno, pela presença de uma frente oceanográfica entre a Corrente do Brasil (CB) e a Corrente Costeira do Brasil (CCB). A frente oceanográfica CB/CCB gera intensos gradientes horizontais termais entre as águas frias da plataforma continental do Sul do Brasil, dominadas pela CCB, e águas quentes do oceano profundo, dominadas pela CB. Esse trabalho analisa, pela primeira vez na literatura conhecida, os mecanismos de acoplamento entre o oceano e a atmosfera a partir de dados observacionais da atmosfera e do oceano que foram tomados simultaneamente durante um cruzeiro de pesquisa oceanográfica na costa sul do Brasil entre 11 a 21 de junho de 2012. Nesse experimento, foram lançadas radiossondas atmosféricas e realizadas estações hidrográficas para medidas de temperatura e salinidade do oceano. A área de estudo foi escolhida com base no gradiente termal local apresentado pela frente CB/CCB. Foram realizados cinco transectos perperndiculares à costa sul do Brasil, iniciando-se na localidade de Paranaguá (PR) até o Chuí (Rio Grande do Sul). As características oceanográficas e meteorológicas de inverno foram consideradas na determinação da derrota do navio. A instalação de uma torre micrometeorológica na proa do navio permitiu a realização de medições diretas dos fluxos de calor, momentum e CO2. Este estudo analisa as condições meteorológicas de grande escala e investiga o comportamento da camada limite atmosférica marinha a partir dos dados in situ das radiossondagens. No período em que os dados foram coletados foram observadas condições atmosféricas típicas de inverno, como a passagem de frente fria associada à incursão de uma massa de ar frio pós-frontal e a formação de ciclone extratropical. Observações meteorológicas e oceanográficas realizadas pelos instrumentos instalados no navio foram utilizadas para estimar os fluxos de calor pelo método bulk formulas. Essas estimativas foram comparadas aos fluxos medidos diretamente pelos sensores instalados na proa do navio. As medidas são obtidas utilizando o método de Covariância de Vórtices, usado amplamente em pesquisas micrometeorológicas. Para obter os fluxos turbulentos na interação oceano-atmosfera são necessárias correções nos dados observados devido ao movimento do navio. Durante a maior parte do período estudo, a temperatura da superfície do mar esteve maior do que a temperatura do ar, gerando uma transferência de calor do oceano para atmosfera. Os fluxos de calor foram, geralmente, positivos em ambos os lados da frente oceanográfica CB (quente)/CCB (frio). Contudo, há diferença na magnitude dos fluxos de calor entre os dois lados da frente com a troca foi mais intensa no lado da CB. Os resultados apresentados mostram que os intensos gradientes horizontais termais entre as águas da CB e da CCB que ocorrem durante o inverno ao largo da costa do RS, os sistemas transientes e as advecções térmicas têm um papel importante na modulação da camada limite atmosférica marinha e nos fluxos de calor e CO2. Observações meteorológicas e oceanográficas são fundamentais para ampliar o entendimento dos processos que ocorrem na interface oceano-atmosfera e tem importância primária para a previsão do tempo e clima.
Velissariou, Panagiotis. "Development of a Coastal Prediction System That Incorporates Full 3D Wave-Current Interactions on the Mean Flow and the Scalar Transport With Initial Application to the Lake Michigan Turbidity Plume." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1229959016.
Повний текст джерелаWang, Shao-Pei, and 王紹培. "A Three-Dimensional Inverse Heat Conduction Problem in Estimating Unknown Boundary Heat Flux." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82280892589654034521.
Повний текст джерела國立成功大學
造船工程學系
86
In the present study a three-dimensional transient inverse heat conductionproblem in solved using the Conjugate Gradient Method( CGM) and the generalpurpose commerical code CFX-4.2-baseed inverse algorithm to estimate the unknown boundary heat flux in any three-dimension irregular domain.The advantage of calling as a subroutine in the present inverse calculationlies in that many difficult but practial 3-D inverse problem can be solved under this construction.Results obtained by using the conjugate gradient method to solve this 3-Dinverse problems are justified based on the numerical experiments. It is cocluded the accurate boundary fluxes can be estimated by the conjugategradient methos except for the final time. The reason and improvement of this singularity are addressed. Finally, the effects of the measurementerrors on the inverse solution are discussed.
Chan, Huang Tsuan, and 黃川展. "Estimation of the Boundary Heat Flux for Hyperbolic Heat Conduction in a Slab." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/35752122035303800802.
Повний текст джерела國立成功大學
機械工程學系
89
An integral analytical solution for non-Fourier heat conduction in a one-dimensional slab is found by Laplace transform. Comparisons of the results and those obtained by a finite-difference method show the validity of the present method. Next, using the analytical solution, a non-iteration scheme is developed to estimate the boundary heat flux from the temporal temperature distribution at the other boundary. Finally, the effects of the temperature error and the thickness of the slab are examined.
HSIEHCHI-CHENG and 謝其丞. "Boundary Heat Flux of Pure Tin and Aluminum by Using Inverse Methods." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7a8ncz.
Повний текст джерелаWu, Cheng-Min, and 吳政旻. "The application of molecule-based temperature sensors for surface and fluid temperature measurement inside rectangular microchannel under constant heat flux boundary condition." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11984681527061374936.
Повний текст джерелаValentín, Ricky. "Analysis of boundary constraints in the shape synthesis optimization of a 2-dimensional plate subjected to arbitrary heat flux input for application to electronic boards." 1997. http://catalog.hathitrust.org/api/volumes/oclc/37745234.html.
Повний текст джерелаTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 88-91).
Kumar, Vijay. "Installation and Operation of Air-Sea Flux Measuring System on Board Indian Research Ships." Thesis, 2017. http://etd.iisc.ernet.in/2005/3778.
Повний текст джерела