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Rozprawy doktorskie na temat „Vertical diameter”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Peng, Deng-Jr. "Prediction of vertical flows in large diameter pipes." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7021.

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There is an increasing interest in multiphase flows in large diameter vertical pipes (typically with diameters greater that 100 mm) in the context of hydrocarbon production systems. There are strong indications that flows in such pipes differ greatly from those in smaller diameter pipes on which most of the prediction methodologies are based. In small diameter pipes, an important mechanism for the bubble flow to slug flow transition is the formation of void waves. This research reveal this wave growth and also predict the breakdown points from bubble-to-slug flow transition using Biesheuvel an

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Mahmoud, Mohamed M. "Flow boiling of R134a in vertical mini-diameter tubes." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/5101.

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The current study is a part of a long term experimental project devoted to investigate flow boiling heat transfer, pressure drop and flow visualization of R134a in small to mini/micro-diameter tubes. The experimental facility was first designed and constructed by X. Huo (2005) with the contribution of L. Chen (2006). In the present study, the experimental facility was upgraded by changing the heating system from AC to DC heating and also upgrading the logging system through using a faster data logger and developing a new Labview program. The objectives of the current study include (i) contribu

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3

Ali, Shazia Farman. "Two-phase flow in a large diameter vertical riser." Thesis, Cranfield University, 2009. http://hdl.handle.net/1826/4476.

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The rapid depletion of hydrocarbon fields around the world has led the industry to search for these resources in ever increasing water depths. In this context, the large diameter (D > 100mm) vertical riser has become a subject of great interest. In this research work, a major investigation was undertaken to determine the two phase flow hydrodynamics in a 254mm vertical riser. Two types of experiments were performed for range of air-water superficial velocities. The first experimental campaign addresses the issue of the two gas injector’s performances (conventional vs. novel design gas injector

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4

Van, der Meulen Gerrit Pieter. "Churn-annular gas-liquid flows in large diameter vertical pipes." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12581/.

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This thesis presents an investigation on the churn to annular flow pattern boundary in an 11 m tall, 127 mm id vertical riser. Experimental data on film thickness, pressure drop and drop size and velocity was analysed and interpreted. Entrained fraction, interfacial and wall shear stresses and the interfacial friction were calculated from the experimental data. A new churn-annular flow transition boundary was derived based on trends, and in particular changes of slopes, observed in film thickness, pressure drop and structure velocity data. This is supported by observations made using high spee

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Mohammed, Shara Kamal. "Gas-high viscosity oil flow in vertical large diameter pipes." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43311/.

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Gas flow in columns of high viscosity liquids is found in heavy oil and bitumen production, polymer manufacturing and in Volcanology as silicate magmas in the volcanic conduit. Predicting the characteristics of the hydrodynamics of gas flow, under such conditions is essential in both design and safety assessments. In oil and gas industry, it is very important in the design of the equipment and the very long pipelines. Further, it is important in the design and safety of the industrial equipment and the pipelines in the polymer manufacturing. Finally, the ability to predict natural phenomenon a

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6

Martin, Callizo Claudi. "Flow Boiling Heat Transfer in Single Vertical Channels of Small Diameter." Doctoral thesis, KTH, Tillämpad termodynamik och kylteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-25797.

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Microchannel heat exchangers present many advantages, such as reduced size, high thermal efficiency and low fluid inventory; and are increasingly being used for heat transfer in a wide variety of applications including heat pumps, automotive air conditioners and for cooling of electronics.However, the fundamentals of fluid flow and heat transfer in microscalegeometries are not yet fully understood. The aim of this thesis is to contribute to a better understanding of the underlying physical phenomena in single-phase and specially flow boiling heat transfer of refrigerants in small channels. For

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7

Aliyu, A. M. "Vertical annular gas-liquid two-phase flow in large diameter pipes." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9848.

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Gas-liquid annular two phase flow in pipes is important in the oil and gas, nuclear and the process industries. It has been identified as one of the most frequently encountered flow regimes and many models (empirical and theoretical) for the film flow and droplet behaviour for example have been developed since the 1950s. However, the behaviour in large pipes (those with diameter greater than 100 mm) has not been fully explored. As a result, the two- phase flow characteristics, data, and models specifically for such pipes are scarce or non-existent such that those from smaller pipes are extrapo

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8

Omebere-Iyari, N. K. "The effect of pipe diameter and pressure in vertical two-phase flow." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526753.

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9

Zangana, Mohammed Haseeb Sedeeq. "Film behaviour of vertical gas-liquid flow in a large diameter pipe." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12782/.

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Gas-liquid flow commonly occurs in oil and gas production and processing system. Large diameter vertical pipes can reduce pressure drops and so minimize operating costs. However, there is a need for research on two-phase flow in large diameter pipes to provide confidence to designers of equipments such as deep water risers. In this study a number of experimental campaigns were carried out to measure pressure drop, liquid film thickness and wall shear in 127mm vertical pipe. Total pressure drop were studied systematically through a data bank of 600 experimental runs. Magnitude and directional w

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10

Wong, Wai-Chuen. "Effect of tube diameter on critical heat flux in vertical steam-water flow." Thesis, University of Ottawa (Canada), 1997. http://hdl.handle.net/10393/4295.

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The effect of tube diameter on critical heat flux (CHF) has been examined by (1) analyzing existing experimental data, (2) reviewing existing correlations and semi-analytical models, and (3) obtaining CHF measurements in two vertical tubes of different diameters. Based on constant local flow conditions, the parametric trend of available CHF data shows generally a decreasing CHF with increasing tube diameter. Due to the large data scatter (inherent uncertainty within different sets of data), a definite conclusion cannot be drawn. The observations indicated that the tube-diameter effect on CHF i

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11

Shawkat, Mohamed Ezz El-Din Ibrahim Saleh Ching Chan Y. Shoukri Mamdouh. "Liquid turbulence structure in two-phase bubbly flow in a large diameter vertical pipe." *McMaster only, 2007.

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12

Cruz, Luciani Paola Rocha. "Modifica??o superficial do tecido de malha de ?cido polilatico (PLA) por tratamento plasma." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15723.

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Made available in DSpace on 2014-12-17T14:58:24Z (GMT). No. of bitstreams: 1 LucianiPRCB_DISSERT.pdf: 1590576 bytes, checksum: b6a8be3214f47da9445a11624c33de1c (MD5) Previous issue date: 2013-08-08<br>Some fibrous materials, for having properties such as biocompatibility, strength and flexibility, are of great interest for medical and pharmaceutical applications. Among these materials, the fabric made from polylactic acid (PLA) has received special attention, and beside to present these features, is derived from biological source, antimicrobial and bioabsorbable. One of the limitations of PL

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13

Martinez, Jean-Michel. "Estimation de la biomasse forestière et caractérisation de la structure verticale des peuplements de conifères par radar VHF et radar sondeurs aéroportés." Phd thesis, ENGREF (AgroParisTech), 2000. http://pastel.archives-ouvertes.fr/pastel-00000036.

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Les préoccupations liées à l'estimation et au suivi de la ressource forestière se sont considérablement accrues ces dernières années, notamment afin de surveiller et de prévoir l'impact d'une pression anthropique croissante sur les écosystèmes forestiers. Ces efforts nécessitent une meilleure caractérisation des couverts forestiers. La télédétection micro-ondes active (télédétection " radar ") apparaît comme un outil adapté à ces préoccupations, par la sensibilité des ondes radar aux caractéristiques biophysiques des couverts. Pourtant, l'inversion de variables d'intérêts descriptives des couv

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14

CHIMENTO, CARLO. "ASSESSMENT OF THE CARBON SEQUESTRATION POTENTIAL IN SOIL AND IN BELOWGROUND BIOMASS OF SIX PERENNIAL BIOMASS CROP." Doctoral thesis, Università Cattolica del Sacro Cuore, 2015. http://hdl.handle.net/10280/6072.

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L'obiettivo della ricerca è stato quello di identificare la coltura bioenergetica con il maggior potenziale di sequestro del carbonio (C); sono state considerate tre colture perenni arboree (pioppo, robinia e salice) e tre colture erbacee perenni (canna comune , miscanto e panico ) al sesto anno dal loro impianto e coltivate nello stesso ambiente. In primo luogo sono state misurate le variazioni dei tassi del C organico del suolo (COS) per il primo 1 m, mentre per i primi 30 cm di suolo è stato stimato il grado di stabilita del COS valutando sette frazioni di COS che presentano differenti grad

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15

CHIMENTO, CARLO. "ASSESSMENT OF THE CARBON SEQUESTRATION POTENTIAL IN SOIL AND IN BELOWGROUND BIOMASS OF SIX PERENNIAL BIOMASS CROP." Doctoral thesis, Università Cattolica del Sacro Cuore, 2015. http://hdl.handle.net/10280/6072.

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L'obiettivo della ricerca è stato quello di identificare la coltura bioenergetica con il maggior potenziale di sequestro del carbonio (C); sono state considerate tre colture perenni arboree (pioppo, robinia e salice) e tre colture erbacee perenni (canna comune , miscanto e panico ) al sesto anno dal loro impianto e coltivate nello stesso ambiente. In primo luogo sono state misurate le variazioni dei tassi del C organico del suolo (COS) per il primo 1 m, mentre per i primi 30 cm di suolo è stato stimato il grado di stabilita del COS valutando sette frazioni di COS che presentano differenti grad

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16

Williams, Susan Nicole. "Flooding Experiments with Steam and Water in a Large Diameter Vertical Tube." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-2942.

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An experimental study on flooding with steam and water in a large diameter vertical tube was conducted. This research has been performed to provide a better prediction of flooding in a pressurized water reactor (PWR) pressurizer surge line to be used in reactor safety codes. Experiments were conducted using a 3-inch (76.2 mm) diameter tube 72 inches (1.83 m) long with subcooled water and super-heated steam at atmospheric pressure as the working fluids. Water flows down the inside walls of the tube as an annulus while the steam flows upward in the middle. The water flow rates ranged from 3.5 to

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17

Huang, Zhi Hao, and 黃志豪. "Effect of diameter on heat transfer of a confined vertical impinging jet." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/15961305535498742302.

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18

Cullum, Wes. "Subcooling Effects for Flooding Experiments with Steam and Water in a Large Diameter Vertical Tube." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11595.

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A counter current annular flow experiment was performed to determine flooding conditions for varying degrees of subcooling using steam and water. The findings can be used in reactor safety codes to provide an improved model of flooding during accident analysis. The test section is a stainless steel tube which is approximately a 5/16 scale version of a pressurized water reactor (PWR) surge line. The water flows in an annular film down the inside of the tube and steam flows upward through the annulus. Flooding is the point at which the water film reverses direction and begins to travel upward. F

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19

tsai, chia-wei, and 蔡家偉. "Air-Water Two-Phase Flow Pattern Distribution in Small Diameter Vertical Split U-Type Junctions." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/51207228185944644257.

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碩士<br>國立雲林科技大學<br>機械工程系碩士班<br>92<br>The split U-type junctions are commonly utilized in the condensers and evaporators of refrigeration systems. After splitting through a U-type junction, a maldistribution of the phases may occur when the flow resistances in both legs are not equal. Accordingly the flow pattern change is expected very complex within the U-type junction and the flow pattern in the two legs downstream will not be the same as the upstream. This study is to conduct a series air-water two-phase flow tests in two vertical U-type glass junctions to observe the pattern distribution in

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20

Yung-ShiangLin and 林詠翔. "Study of Heat Transfer Characteristics for Vertical Plate Fin and Tube Heat Exchangers with Different Tube Diameters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/52658444325977769888.

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碩士<br>國立成功大學<br>機械工程學系<br>104<br>The present study applies the inverse method and CFD software in conjunction with the experimental method to predict the heat characteristics of plate-fin and tube heat exchangers. The effects of parameters such as fin pitch, air velocity and tube diameter are examined. Since the heat transfer coefficient on the fin is not uniform, the fin is divided into several sub-regions and the heat transfer coefficient in each sub-regions is assumed to be a constant. Later, the inverse method applies finite difference method in conjunction with the least-squares scheme an

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21

Abou, Rajab Yasmin Joana Monna. "Shade trees in cacao agroforestry systems: influence on roots and net primary production." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-002B-7C03-E.

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