Tesi sul tema "Cylindrical pipe"
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Tribbe, Christian. "Gas/liquid flow in cylindrical and corrugated channels". Thesis, University of Surrey, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244760.
Ozcakir, Ozge. "Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148.
Basco, Scott William. "One Dimensional Approach to Modeling Damage Evolution of Galvanic Corrosion in Cylindrical Systems". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367489568.
Komminaho, Jukka. "Direct numerical simulation of turbulent flow in plane and cylindrical geometries". Doctoral thesis, Stockholm, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3054.
Ghanbarpourgeravi, Morteza. "Investigation of Thermal Performance of Cylindrical Heatpipes Operated with Nanofluids". Doctoral thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202566.
QC 20170228
McVicker, William Richard. "An analytical approach to open, cylindrical organ-pipe scaling from a historical perspective with specific reference to the scaling practices of selected organ-builders". Thesis, Durham University, 1987. http://etheses.dur.ac.uk/1551/.
Salahifar, Raydin. "Analysis of Pipeline Systems Under Harmonic Forces". Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19820.
Charles, Antoine Henri Etienne. "Étude thermo-rhéologique de boues digérées : application à l’écoulement en conduite dans les procédés de méthanisation". Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0008.
The society’s wastewater treatment needs are met by waste water treatment plants that produce sludges. In order to anticipate the increase in this requirement in the future, the sludge treatment processes must achieve a certain level of efficiency in terms of sludge treatment and recovery. The anaerobic digestion process significantly reduces the volume of sludge generated and can the be used for agricultural and energy purposes, in the form of digestate, biogas, electricity or heat. It is nevertheless limited by ineffective control of the transport of digested sludge within it, due to a lack of knowledge of thermo-rheology, in terms of understanding and characterisation methods, and of the hydrodynamics involved in handling these very diverse sludges. This manifests itself operationally, downstream of the sizing and design phase, in inefficient pumping, matrix heterogeneity or component clogging.It is in this context of providing scientific elements, on the one hand of the therm-rheological characerisation of digested sludge and on the other hand of the demonstration of the hydrodynamics of these fluids in operation, that the research work carried out within the framework of this thesis falls within the scope of.Firstly, protocols dedicated to the specific characterisation of each non-Newtonian behaviour have been established. The application of these protocols, at the ITM Nord Europe – Energy Environment research centre and on the industrial partner’s Characterisation plateform, shows that the thermo-rheological characteristics of digested sludge are accurately modelled by a non-modified Herschel-Bulkley model. Yield stress and shear-thinning are significantly more important than the other thermo-rheological characteristics of thixotropy, viscoelasticity and thermo-dependence. The unanticipated physical phenomon of wall slip is observed in these digested sludges, leading to heterogeneous flow hydrodynamics under conditions of low inertia and loaw wall roughness.Secondly, an experimental set-up dedicated to studying the flow of such fluids in pipe is being set up, with a visualisation to determining their hydrodynamic behaviour. Using working fluids (Carbopol solutions), it was demonstrated that these fluids undergo a rheo-inertial transition (RIT) towards turbulence. This transition is characterised by the existence of a pre-transition regime, non-existent for a Newtonian fluid, within which the flow exibits an asymmetry, which is observed by direct visualisation. These visualisations, coupled with the measurement of pressure drops, also make it possible to quantify the intermittency of the RIT on the basis of the turbulent structures visualised. This makes it possible to control the movement of such fluids through knowledge of the stabilisation of their flows and the increase in the residence time of turbulent structures, due to the non-Newtonian characteristics without viscoelasticity.Thus, this thesis manuscipt summarises the scientific elements developed within the framework of this thesis to respond to the problems of the operational obstacles encountered. As these problems stem from a lack of fundamental knowledge of the thermo-rheology and hydrodynamics of the sludge that flows through it, the study focuses its research on these two areas in order to provide the fundamentals that will make it possible to improve the control of sludge transport within the anaerobic digestion process in wastewater treatment plants
Guo, Dongshan. "Pipe inspection by cylindrically guided waves". Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289714.
Shaul, Robert. "Wave forces on cylindrical piles and pile groups : a critical review". Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/8293.
This thesis is a critical review of methods of predicting wave forces on vertical piles or groups of piles. It assigns different force prediction theories to different situations or flow regimes and analyses their advantages and disadvantages. The thesis is split into two sections: Section I reviewing the force prediction methods for single piles, and Section II for groups of piles.
Kolomazník, Milan. "Predikce koroze trubek pece s využitím provozních dat". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231497.
Woolfe, Katherine. "A scaled physical model for underwater sound radiation from a partially submerged cylindrical shell under impact". Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44874.
Nash, David Hugh. "Local loading and saddle supports on cylindrical vessels : some analytical and finite element studies of local load and saddle support problems with a special emphasis towards generating improved design methods". Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325680.
Leonard, Kevin Raymond. "Ultrasonic guided wave tomography of pipes: A development of new techniques for the nondestructive evaluation of cylindrical geometries and guided wave multi-mode analysis". W&M ScholarWorks, 2004. https://scholarworks.wm.edu/etd/1539616737.
Machado, Alexandre Cunha. "Um elemento finito de tubo tridimensional para análise geometricamente não linear de dutos". Universidade Federal de Alagoas, 2006. http://repositorio.ufal.br/handle/riufal/394.
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
No transporte de fluidos ou mesmo como elementos estruturais as cascas cilíndricas são largamente utilizadas em diversos segmentos da engenharia civil. A compreensão do comportamento desse tipo de estrutura ao longo de uma trajetória de equilíbrio resultante de um histórico de carregamento de diferentes naturezas é importante na definição da real capacidade portante dos dutos. Neste trabalho, desenvolve-se um elemento finito para análises geometricamente não lineares tridimensionais de tubos. Levando-se em consideração a natureza da análise, são estudadas medidas adequadas de tensão e deformação, compatíveis com regimes de grandes deformações e deslocamentos. A formulação Lagrangeana Total é adotada, mas as relações constitutivas utilizadas são lineares. A implementação computacional desenvolvida emprega um elemento finito tridimensional de tubo com 2 ou 3 nós, compatível com o regime de grandes deformações e deslocamentos, incorporando, também, os movimentos de corpo rígido da estrutura. Com o objetivo de mapear as trajetórias não lineares de equilíbrio, utilizando-se algumas metodologias propostas na literatura, é usada uma estrutura de programação orientada a objetos, permitindo a aplicação de diferentes técnicas de análise incremental e iterativa integradas à implementação de elementos finitos supracitada. Visando validar a formulação, os resultados obtidos no programa desenvolvido são avaliados através da comparação com soluções analíticas e outras análises numéricas disponíveis na literatura.
Ruini, Mattia. "Modellazione di un sistema per la dissipazione delle vibrazioni generate dall'installazione delle fondazioni delle turbine eoliche". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Boot, John C. "Design of cylindrical plastic pipe linings to resist buckling due to collapse pressures". 2005. http://hdl.handle.net/10454/462.
Boot, John C., Akbar A. Javadi e Irina L. Toropova. "Predicting the creep lives of thin-walled cylindrical polymeric pipe linings to external pressure". 2004. http://hdl.handle.net/10454/3443.
This paper considers both the linear elastic and creep buckling of polymeric pipe linings used for the rehabilitation of gravity pipes, for which external groundwater pressure has been identified as the prime source of loading. Theoretically perfect and imperfect conditions are considered, with the imperfections taken to be in the form of a concentric or eccentric annulus between the rigid host pipe (cylindrical constraint) and polymeric lining. Under these conditions two recently obtained mathematical procedures for the prediction of linearly and non-linearly elastic buckling are compared with the results of complementary laboratory testing. Linear elastic conditions are shown to be well approximated by undertaking short-term (¿30 min) testing under increasing pressure to failure. Controlled imperfections are introduced into the laboratory tests and excellent correlation with the theoretical predictions is obtained. In particular, the dominant geometrical imperfections are shown to be major influences on the obtained buckling pressure. The mathematical models are then adapted to simulate the creep buckling process under long-term constant pressure. The results obtained are again compared with those provided by complementary physical testing, and appropriate conclusions are made.
Boot, John C., Akbar A. Javadi e Irina L. Toropova. "The structural performance of polymeric linings for nominally cylindrical gravity pipes". 2004. http://hdl.handle.net/10454/2837.
This paper considers both the linear elastic and creep buckling of polymeric pipe linings used for the rehabilitation of gravity pipes, for which external groundwater pressure has been identified as the prime source of loading. Theoretically perfect and imperfect conditions are considered, with the imperfections taken to be in the form of a concentric or eccentric annulus between the rigid host pipe (cylindrical constraint) and polymeric lining. Under these conditions two recently obtained mathematical procedures for the prediction of linearly and non-linearly elastic buckling are compared with the results of complementary laboratory testing. Linear elastic conditions are shown to be well approximated by undertaking short-term (¿30 min) testing under increasing pressure to failure. Controlled imperfections are introduced into the laboratory tests and excellent correlation with the theoretical predictions is obtained. In particular, the dominant geometrical imperfections are shown to be major influences on the obtained buckling pressure. The mathematical models are then adapted to simulate the creep buckling process under long-term constant pressure. The results obtained are again compared with those provided by complementary physical testing, and appropriate conclusions are made.
Huang, Chun-Ming, e 黃俊銘. "Experimental Investigation on the Thermal Performance of a Lop Heat Pipe with a Cylindrical Evaporator". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/75623637529463839455.
國立臺灣科技大學
機械工程系
92
The heat transfer characteristics of a loop heat pipe with cylindrical-shaped evaporator was studied experimentally. Thermocouples were used to measure temperatures along the loop. Trends of steady-state operating temperature are presented and explained at various operating conditions. The effects of different factors, such as the tilt angles of the loop, the cooling fan speed, the amount of charging capacity of the working fluid, and the type of working fluid, were studied in detail. Temperature hysteresis and low-power start-up problems were observed and discussed. The maximum heat transport capacity was up to 300 watts and the thermal resistance was only 0.035oC/W at 300W heat input, with a corresponding evaporator temperature at 69.3oC.
Lin, Zong-Le, e 林宗樂. "A Study on the Relationship between the Signal Characteristic of Electromagnetic Acoustic Transducer(EMAT) and the Defect of Cylindrical Pipe". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/56813953360351398024.
雲林科技大學
環境與安全工程系碩士班
98
There are sets of considerable numbers of pipes in the oil refining, petrochemical and other plants. The pipes are mostly used with metal as conduction pipes, using solder joints to form a piping system. The metal pipes demand for a layer of insulation coated in the pipe surface to achieve the purpose of insulation and corrosion, because of long-term transport of gas and liquid. Due to the space limits, the pipes are bent into a variety of angels or buried under the ground surface. Because the coated pipelines are not easy to disassemble and are buried under the ground surface, it is hard to observe the flaw of the pipelines. Once the pipeline defects occure, there will be an extreme threat for the industrial safety, causing significant loss of plant operating and personnel safety.As the non-destructive testing (NDT) technology was developed fastly, the fast and long-range ultrasonic testing technique is often used for pipeline inspection. Electromagnetic acoustic transducer (EMAT) is non-contact, without coupling operation, and suitable for testing at high temperature or defects at rough pipeline surface. This study aimed to detect the artificial pipeline by using EMAT, and to explore the relation between the defect and signal. By measuring the signal amplitude, we discovered that the length of the defect increases with the amplitude attenuation and the depth of defect will affect the amplitude attenuation. In addition, the amplitude attenuation will increase with flat-bottomed hole area of the defect obviously. This study showed that the signal amplitude attenuation of EMAT can be affected by the defect depth, the defect length, and the hole area of the pipeline.
Cai, Shun-Ji, e 蔡舜吉. "Digital Image Correlation for analysis of cracked cylindrical pipes". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41222012644669684387.
國立中興大學
土木工程學系所
97
Abstract The stress concentration at the tip of the crack in the penstock may ignite the fast crack growth and lead to the total failure of the penstock. In the study, the technique of Digital Image Correlation (DIC) is applied to detect the strain distribution around the crack tip in a penstock subjected to the pressure of water. With the experiment results, the DIC solutions are in very good agreement with that of finite element within the elastic range of the material. This shows the technique of Digital Image Correlation is feasible in use for strain measurement for penstock.