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Dissertations / Theses on the topic 'Centrifugal heater'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Мартиненко, В. А., Д. С. Москаленко та А. И. Сидорец. "Совершенствование конструкции антипомпажного клапана центробежного нагнетателя ГПА для его эффективной антипомпажной защиты". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8059.

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2

Meyer, Antoine. "Active control of heat transfer by an electric field." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH13/document.

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La stabilité d’un fluide Newtonien diélectrique confiné dans un anneau cylindrique et soumis à un gradient radial de température et à un champ électrique est étudiée. Le gradient de température induit une stratification de la permittivité électrique du fluide et de sa masse volumique. Trois poussées thermiques rentrent alors en jeu : la gravité terrestre créée la poussée d’Archimède, la rotation des cylindres engendre la poussée centrifuge, et le champ électrique induit la poussée diélectrophorétique. L’effet de ces poussées est étudié dans différentes combinaisons, principalement à travers l’

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3

Montanez, Morantes Maria Vanessa. "Operational optimisation of low-temperature energy systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/operational-optimisation-of-lowtemperature-energy-systems(a22bd339-1473-4401-bbc5-2e1280e57756).html.

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Low-temperature energy systems are processes that operate below ambient temperatures and make use of refrigeration cycles, where the main energy consumption is due to the shaft work required to drive the compressors. Very-low-temperature energy systems, also known as cryogenic processes, operate at around -150°C and below. Due to increasing demand of products from cryogenic processes and tighter environmental regulations, existing plants need to be revamped to increase their energy efficiency or adapt to new processing capacities. So, accurate models of the performance of cryogenic processes a

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Johansson, Wilhelm. "Modeling of Wet Scrubber with Heat Recovery in Biomass Combustion Plants." Thesis, Linnéuniversitetet, Institutionen för byggd miljö och energiteknik (BET), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95585.

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During combustion of biomass, particulate matter is emitted, which has severe health impacts on humans. The company ITK Envifront has developed a scrubber technology that cleans the flue gas while also recovering the flue gas energy, increasing the efficiency of the combustion plant. In this thesis, a simulation model was built in MATLAB according to the Finite Element Method. Validation of the model against 3 different facilities showed reasonable accuracy with a tendency to overestimate the scrubber heat recovery and a mean prediction deviation of approximately 7 %. The model was then used t

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Sleiti, Ahmad Khalaf. "EFFECT OF CORIOLIS AND CENTRIFUGAL FORCES ON TURBULENCE AND TRANSPORT AT HIGH ROTATION AND BUOYANCY NUMBERS." Doctoral diss., University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4408.

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This study attempts to understand one of the most fundamental and challenging problems in fluid flow and heat transfer for rotating machines. The study focuses on gas turbines and electric generators for high temperature and high energy density applications, respectively, both which employ rotating cooling channels so that materials do not fail under high temperature and high stress environment. Prediction of fluid flow and heat transfer inside internal cooling channels that rotate at high rotation number and high density ratio similar to those that are existing in turbine blades and generator

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6

Viswanathan, Aroon Kumar. "Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28518.

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Detached Eddy Simulations (DES) is a hybrid URANS-LES technique that was proposed to obtain computationally feasible solutions of high Reynolds number flows undergoing massive separation with reliable accuracy. Since its inception, DES has been applied to a wide variety of flow fields, but mostly limited to unbounded external aerodynamic flows. This is the first study to apply and validate DES to predict the internal flow and heat transfer in non-canonical flows of industrial relevance. The prediction capabilities of DES in capturing the effects of Coriolis forces, which are induced by rotatio

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7

Poorooshasb, Farrokh. "Centrifuge modelling of the dynamic embedment of a heat emitting projectile in normally consolidated clay." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254435.

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8

Sewall, Evan Andrew. "Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180° Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts with Rotation - Effect of Coriolis and Centrifugal Buoyancy Forces." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29858.

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Increasing the turbine inlet temperature of gas turbine engines significantly increases their power output and efficiency, but it also increases the likelihood of thermal failure. Internal passages with tiny ribs are typically cast into turbine blades to cool them, and the ability to accurately predict the flow and heat transfer within these channels leads to higher design reliability and prevention of blade failure resulting from local thermal loading. Prediction of the flow through these channels is challenging, however, because the flow is highly turbulent and anisotropic, and the presenc

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9

Dowd, Cody Stewart. "A Study of Centrifugal Buoyancy and Particulate Deposition in a Two Pass Ribbed Duct for the Internal Cooling Passages of a Turbine Blade." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81181.

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In this thesis, the ribbed ducts of the internal cooling passage in turbine blading are investigated to demonstrate the effects of high speed rotation. Rotation coupled with high temperature operating conditions alters the mean flow, turbulence, and heat transfer augmentation due to Coriolis and centrifugal buoyancy forces that arises from density stratification in the domain. Gas turbine engines operate in particle laden environments (sand, volcanic ash), and particulate matter ingested by the engine can make their way into the blade internal cooling passages over thousands of operating hours

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10

Björk, Johan. "Compressor CFD simulation method development : A CFD study." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69880.

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This master thesis project consisted of three parts that all were performed through CFD simulations with the purpose to develop Scania's methods in the subject of CFD. All parts included simulations on Scania's SC92T70 centrifugal compressor. Part one consisted of performing a mesh study for the purpose of reliability, to investigate the convergence of different parameters by refining the boundary layer. The method used is an inflation option called First layer thickness. Five different meshes were generated where the Richardson extrapolation method was used to examine the parameters between t

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11

Dilavarian, Santiago Marcelo Vacca. "Modelagem matemática da transferência de calor durante a fundição centrífuga." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-07052013-154535/.

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A fundição centrífuga é um importante processo de produção de tubos de ligas metálicas e de cilindros de laminação. A transferência de calor no metal durante a fundição centrífuga de tubos foi modelada matematicamente e o coeficiente de transferência de calor na interface metal-molde determinado em função do tempo utilizando a técnica da solução inversa. A solução inversa foi obtida a partir das curvas de resfriamento experimentais disponíveis na literatura para a fundição centrífuga de um tubo de ferro-fundido. O resultado da solução inversa mostrou, pela primeira vez, que o comportamento do

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12

Malatesta, Vinicius. "Simulação numérica direta de escoamentos sobre superfícies côncavas com transferência de calor." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-23092014-090040/.

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Escoamentos sobre superfícies côncovas estão sujeitos à instabilidade centrífuga, dando origem a vórtices longitudinais, conhecidos como vórtices de Görtler. Esses vórtices são responsáveis por gerar distorções fortes nos perfis de velocidade. Como os vórtices são contra-rotativos, duas regiões surgem entre os mesmos: uma região de upwash e uma região de downwash. Na região de upwash o fluido próximo à parede é jogado para longe da mesma. Na região de downwash acontece o contrário, o fluido que se desloca a uma velocidade maior é jogado em direção à parede. Os vórtices se amplificam inicialm

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13

Arslan, Hulya. "Synthesis And Characterization Of Nickel Based Bulk Amorphous Alloys." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605099/index.pdf.

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The aim of this study is to synthesize and characterize new bulk amorphous alloys in the Ni- based systems. Theoretical studies on the basis of semi-empirical rules and the electronic theory of alloys in pseudopotential approximation has been provided in order to predict the impurity elements that will lead to an increase in the glass forming ability of Ni-based alloy systems. Glass forming ability of ten different compositions of alloys of Ni-Nb, Ni-Fe, Ni-B, Ni-Hf and Ni-Cr was simulated by using FORTRAN programs based on pseudopotential theory. In addition to the binary alloys, ternary allo

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14

Остапенко, А. О. "Підвищення ефективності внутрішніх ущільнень відцентрового компресора для тепло насосної утилізації теплоти випарної установки". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/76510.

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У дослідній частині поставлені задачі дослідження та виконано теоретичне дослідження. Розглянуто 4-й корпус компресора для тепло насосної утилізації теплоти випарної установки. Наведені результати розрахунків, які виконувалися з використанням розрахункових програм. Використовувався експериментальний стенд для визначення витратних характеристик лабіринтних ущільнень, який необхідний для отримання значень величини витрати протікання при різних режимних і геометричних параметрах. Випробування проводилися на модельних р2=0,1 МПа і натурних р2 = 5,3 МПа умовах. Розбіжності в значеннях коефіцієнтів

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15

Heber, Dominici Victoria Blanca. "Design Improvement of a Water Recirculation System for a Cooling Process in a Tobacco Manufacturing Plant." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In the industrial sector, it is possible to observe unexpected behaviours of processes, which were not anticipated in the design stage. Such is the case of a secondary cooling process existing within a tobacco manufacturing plant, which was initially designed to cool and recover clean process water with chilled water for posterior recirculation into the main cooling process. It has been observed that under the design flowrates the plate and frame heat exchanger where the process water is cooled is rapidly clogged by suspended solids coming from the main cooling process, resulting in both high

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16

Méndez, Margio González. "Simulations numériques de la transition de la couche limite sur une surface concave : application à la conception des éoliennes à axe vertical de type Savonius Heat-transfer analysis of a transitional boundary layer over a concave surface with Görtler vortices by means of direct numerical simulations Boundary layer transition over a concave surface caused by centrifugal instabilities." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR05.

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Des simulations numériques directes (DNS) sont calculées aﬁn d’étudier le processus complet de transition laminaire-turbulent d’une couche limite qui se développe sur une surface concave. On constate que l’écoulement traversant une telle géométrie est susceptible de développer des instabilités centrifuges sous forme de tourbillons de Görtler. La transition est déclenchée au moyen d’éléments de rugosité de paroi qui sont également utilisés pour prédéfinir la longueur d’onde transversale des tourbillons de Görtler. Les différentes régions rencontrées dans le processus de transition, c’est-à-dire

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17

Cubas, Jhoan Miguel Cubas. "Estudo experimental do escoamento bifásico ar-água em uma bomba centrífuga radial." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2844.

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PETROBRAS<br>Ao longo dos últimos anos a utilização de bombas centrífugas submersas (BCS) se tornou o segundo método de elevação artificial mais usado na indústria petrolífera. Como a produção típica dos poços petrolíferos submarinos consiste em misturas contendo óleo e gás, as bombas centrífugas estão sujeitas a operar com escoamento bifásico. A presença de gás livre no escoamento provoca instabilidades e degradação da curva de ganho de pressão da bomba. Essa degradação se torna muito grande quando ocorre o fenômeno de surging. Este fenômeno é caracterizado por um grande acúmulo de gás nos ca

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18

Eidt, Henrique Krainer. "Análise do desenvolvimento de filme de líquido em escoamento ascendente sob efeito dos campos centrífugo e gravitacional." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2842.

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PETROBRAS<br>O presente trabalho contempla a análise do desenvolvimento de filme de líquido em escoamento ascendente sob a ação dos campos centrífugo e gravitacional, localizado em uma câmara ciclônica de um sistema de distribuição. No estudo foi analisada a dinâmica de um escoamento bifásico líquido-gás a partir de simulações numéricas, tridimensionais e transientes. Na modelagem numérica do escoamento foi utilizado o modelo de dois fluidos euleriano-euleriano junto com o esquema compressivo para a captura da interface líquido-gás e o modelo de turbulência SST (Shear Stress Transport). As equ

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19

Рачинський, Артур Юрійович. "Гідродинаміка і тепломасообмін в контактному утилізаторі теплоти газокрапельного типу". Thesis, КПІ ім. Ігоря Сікорського, 2017. https://ela.kpi.ua/handle/123456789/19313.

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Роботу присвячено експериментальним дослідженням, що направлені на підвищення ефективності роботи контактних тепломасообмінних апаратів шляхом збільшення міжфазної поверхні тепломасообміну при розпилені рідини відцентровими форсунками, впровадження яких приводить до суттєвої економії матеріальних та енергетичних ресурсів. Виконано комплексні експериментальні дослідження характеристик факелу розпилу рідини (густини зрошення, кута розкриття факела форсунки, середнього об’ємно-поверхневого діаметра крапель рідини). Встановлено вплив вхідних параметрів на відповідні характеристики та визначено пло

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20

Рачинський, Артур Юрійович. "Гідродинаміка і тепломасообмін в контактному утилізаторі теплоти газокрапельного типу". Doctoral thesis, Київ, 2017. https://ela.kpi.ua/handle/123456789/19312.

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Роботу присвячено експериментальним дослідженням, що направлені на підвищення ефективності роботи контактних тепломасообмінних апаратів шляхом збільшення міжфазної поверхні тепломасообміну при розпилені рідини відцентровими форсунками, впровадження яких приводить до суттєвої економії матеріальних та енергетичних ресурсів. Виконано комплексні експериментальні дослідження характеристик факелу розпилу рідини (густини зрошення, кута розкриття факела форсунки, середнього об’ємно-поверхневого діаметра крапель рідини). Встановлено вплив вхідних параметрів на відповідні характеристики та визначено пло

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21

Bizzarri, Didier. "Compact air separation system for space launcher." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210488.

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A compact air separator demonstrator based on centrifugally enhanced distillation has been studied. The full size device is meant to be used on board of a Two Stage To Orbit vehicle launcher. The air separation system must be able to extract oxygen in highly concentrated liquid form (LEA, Liquid Enriched Air) from atmospheric air. The LEA is stored before being used in a subsequent rocket propulsion phase by the second stage of the launcher. Two reference vehicles are defined, one with a subsonic first stage and one with a supersonic first stage. In both cases, oxygen collection is performed d

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22

WANG, CHUNG-WEI, and 王忠維. "Benefit Analysis of Magnetic Bearing Centrifugal Chillers series Water Source Heat Pump." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/w2j29u.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系<br>107<br>This research is mainly used for the mixing of heat pump and ice water during the operation of maglev. Since the maglev has better integrated part load value (IPLV), it can obtain higher ice water efficiency under partial load. The heat pump has a higher heat transfer efficiency, and the energy transfer process requires only a small portion of the power to provide a better amount of hot water heating. In the case of this study, the improved efficiency of the maglev host can reach an average of about 28% to 30% energy saving. After the hot water is improve

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23

Chen, Ming-Ke, and 陳明科. "Energy Efficiency of Centrifugal Chillers under Different Heat Loads and Cooling Water Temperatures." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29268326233620966979.

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碩士<br>國立勤益科技大學<br>冷凍空調系<br>101<br>In this study, centrifugal chillers of 1000 USRT with constant and varied speed in Chiayi area of Taiwan was investigated, respectively, in order to understand their operation efficiencies under different heat loads and different cooling temperatures. Through the simulation of the software, YORKWORK, it is found that the performance of the chiller with constant speed is superior to that of the chiller with varied speed while the operation condition is 100% heat load and the temperature of cooling water is above 27 ℃ or the operation condition is 90% heat load

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24

Meng-Yu, Chen, and 陳孟鈺. "Rotating Effects on Heat and Fluid Flows in a Simulated Turbine Blade Internal Cooling Passage with Various Rib Arrangements (Appendix: Flow Characteristics in a Centrifugal Fan)." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/13120439849491098895.

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博士<br>國立清華大學<br>動力機械工程學系<br>90<br>Rotating machines are widely encountered in industrial applications. However, it is very hard to measure their internal flow fields. As a result, the relevant fluid flow information is scarce in the open literature and their designs often rely on trial and errors. Moreover, although heat transfer results based on thermocouple readings have provided valuable information for reference, they gave actually regional averaged values instead of local values. In view of this fact, non-intrusive and full-plane heat transfer measurement techniques are preferred to revea

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Corti, Ferdinando, Bruno Zanoni, and Lorenzo Guerrini. "Innovation in extra virgin olive oil (evoo) processing." Doctoral thesis, 2023. https://hdl.handle.net/2158/1300080.

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The thesis was motivated by the need to enrich the current knowledge in the extra virgin olive oil (EVOO) processing. In particular, the experimental studies focused on critical issue for the EVOO quality, related to three different fundamental operations: the olive fruit storage before milling, the temperature control during malaxation and the cross-batch contamination in the decanter centrifuge. The innovative features of the research work concerned both the plant and machines and the methodological approaches for the study of the relationship between the operative parameters/ procedures and

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