Дисертації з теми "Flow and heat transfer"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Flow and heat transfer".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Barker, Adam. "Heat transfer in unsteady pipe flow." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428390.
Повний текст джерелаWen, Dongsheng. "Flow boiling heat transfer in microgeometries." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414305.
Повний текст джерелаLeung, Sharon Shui Yee. "Heat transfer in microchannels : taylor flow." Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/17835.
Повний текст джерелаNajibi, Seyed Hesam. "Heat transfer and heat transfer fouling during subcooled flow boiling for electrolyte solutions." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/773/.
Повний текст джерелаWongl, Li Shing. "Flow and heat transfer in buoyancy induced rotating flow." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250118.
Повний текст джерелаSun, Guang. "Heat transfer in forced convective flow boiling." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/11255.
Повний текст джерелаMala, Gh Mohiuddin. "Heat transfer and fluid flow in microchannels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/NQ39562.pdf.
Повний текст джерелаRobertson, Andrew J. "Extended surface flow and heat transfer studies." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302219.
Повний текст джерелаPutivisutisak, Sompong. "Computation of heat transfer and flow in compact heat-exchanger geometries." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/8536.
Повний текст джерелаMiró, Jané Arnau. "Flow and heat transfer of impinging synthetic jets." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667300.
Повний текст джерелаEls jets sintètics (SJ) són produïts pel moviment oscil·latori d'una membrana a l'interior d'una cavitat, cosa que fa que el líquid entri i surti per un petit orifici. Això es tradueix en un jet que és capaç de transferir energia cinètica i impuls a un medi fluid sense la necessitat d'una font externa. És per això que els SJ són interessants i tindran un paper clau en una àmplia gamma d'aplicacions rellevants, com ara el control actiu de flux, el refredament tèrmic o la barreja de combustible. Des del punt de vista fenomenològic, els SJ estan formats per patrons de flux elaborats per la seva naturalesa no lineal i, sota certes condicions, es poden observar fluxos complexos i inestables. Aquesta tesis està centrada en la investigació del flux de fluids i el rendiment tèrmic dels jets sintètics. S'estudien dues geometries diferents d’actuadors de SJ (és a dir, ranurats i circulars). Els jets en ambdues configuracions estan confinats per dues plaques isotèrmiques paral·leles amb una diferència de temperatura imposada i afecten a una placa escalfada situada a una certa distància de l'orifici de l'actuador. Les equacions tridimensionals inestables de Navier-Stokes es resolen per un nombre de Reynolds utilitzant simulacions numèriques precises en el temps. A més, es desenvolupa un model detallat de l'actuador que utilitza la formulació arbitrària lagrangiana-euleriana (ALE) per explicar el moviment de la membrana de l'actuador. Aquest model, basat en els números de govern del flux, s'utilitza per realitzar els anàlisis numèrics. Els fluxos obtinguts en ambdues configuracions són notablement diferents i tridimensionals per a gairebé tots els números de Reynolds considerats. El jet en la configuració ranurada està format per un parell de vòrtexs que experimenten una transició turbulenta que finalment formen el jet. El flux extern està dominat per dues recirculacions principals amb els seus homòlegs dins de la cavitat de l'actuador. Una nova estructura, observada en els jets ranurats confinats, apareix com una interacció del flux amb la paret inferior i provoca un canvi en els mecanismes de transferència de calor del jet. D'altra banda, el jet en la configuració circular presenta tres regions de flux diferents que s'han identificat segons la literatura: l'anell de vòrtex principal, el jet final i el nucli potencial. En aquest cas, el flux extern està dominat per l'anell de vòrtex principal i el jet de sortida, presentant així un comportament diferent de morfologia i transferència de calor que la configuració ranurada. Un anàlisi detallat de les trajectòries de vòrtex ha demostrat que els vòrtexs de la configuració circular arriben a la paret superior abans que els seus homòlegs ranurats. Les distribucions d'energia cinètica turbulenta a l'expulsió, entre altres, han revelat que el flux del jet circular es concentra majoritàriament a prop de la línia central del jet, mentre que és més estès per a la configuració ranurada. Per aquestes raons, a la mateixa velocitat d'ejecció del jet i geometria de l'actuador, la formació de SJ en la configuració circular pot produir-se a freqüències més altes que a la configuració ranurada. L'anàlisi de la temperatura de sortida dels SJ ha demostrat que assumir un perfil uniforme és raonable si el nombre de Reynolds és prou elevat. A més, la temperatura del jet de sortida és significativament superior a la temperatura de la placa freda. Les dues configuracions presenten diferents comportaments a causa de les diferències en el flux. L’anàlisi de la transferència de calor a la paret calenta ha revelat que la configuració circular arriba a un màxim de transferència de calor més gran que la configuració ranurada, però, la transferència de calor es desaccelera més ràpidament en la configuració circular quan s’allunya de la línia central. Finalment, es proposen correlacions per a la transferència de calor a la paret calenta i la temperatura de sortida amb el nombre de Reynolds. Poden ser útils per incloure els efectes de la cavitat quan s’utilitzen models simplificats que no tenen en compte la cavitat de l’actuador.
Beale, Steven Brydon. "Fluid flow and heat transfer in tube banks." Thesis, Imperial College London, 1992. http://hdl.handle.net/10044/1/8103.
Повний текст джерелаTanase, Aurelian. "Flow and Heat Transfer in Tubes with Obstacles." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36514.
Повний текст джерелаMoschandreou, Terry. "Heat transfer with pulsatile flow in a tube." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21326.pdf.
Повний текст джерелаGuellouz, Mohamed Sadok. "Turbulent flow and heat transfer in rod bundles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/NQ36774.pdf.
Повний текст джерелаPalafox, Pepe. "Gas turbine tip leakage flow and heat transfer." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427699.
Повний текст джерелаZu, Yingqing. "Computational modelling of complex flow and heat transfer." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537819.
Повний текст джерелаHalimic, Elvedin. "Two-phase flow heat transfer in micro-channels." Thesis, University of Newcastle Upon Tyne, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578553.
Повний текст джерелаFoumeny, N. K. A. "Flow and heat transfer in air-lift systems." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355229.
Повний текст джерелаGlober, S. "Flow and heat transfer inside enhanced performance tubes." Thesis, University of Brighton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373908.
Повний текст джерелаDucharme, Robert Jason. "Flow and heat transfer processes in glass manufacture." Thesis, University of Essex, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292090.
Повний текст джерелаTian, Jing. "Fluid flow and heat transfer in woven textiles." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615243.
Повний текст джерелаMadamadakala, Ganapathi Reddy. "Heat transfer and flow characteristics of sonic nozzle." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/15911.
Повний текст джерелаDepartment of Mechanical and Nuclear Engineering
Steven Eckels
The current research presents the experimental investigation of heat transfer and flow characteristics of sonic multiphase flow in a converging-diverging nozzle. R134a and R123 are used in this study. Four different nozzle assemblies with two different throat sizes (2.43mm and 1.5 mm with 1° growth angle with the centerline of the nozzle in the diverging section) and two different heater lengths (200 mm and 125 mm) were tested. Each test section was an assembly of aluminum nozzle sections. The experimental facility design allowed controlling three variables: throat velocity, inlet temperature, back pressure saturation temperature. The analysis used to find the average heat transfer of the fluid to each nozzle section. This was achieved by measuring the nozzle wall temperature and fluid pressure in a steady state condition. Two methods for finding the average heat flux in sonic nozzle were included in the data analysis: infinite contact resistance and zero contact resistance between nozzle sections. The input variables ranges were 25 °C and 30 °C for inlet temperature and back pressure saturation temperatures, 1100-60,000 kg/m[superscript]2s for mass flux, and 1.4-700 kW/m[superscript]2 heat flux. The effect of the mass flux and heat flux on the average two-phase heat transfer coefficients was investigated. The flow quality, Mach number(M), and Nusselt number ratio ([phi]) were also calculated for each section of the nozzle. As the fluid flowed through the nozzle, the pressure of the liquid dropped below the inlet saturation pressure of the liquid due to sonic expansion in the nozzle. This temperature drop was significantly lower in the case of R134a than R123. The results showed that the two-phase heat transfer coefficients were above of 30000 W/m^2 K in the first 75 mm of the nozzle, and they decreased along the nozzle. The Mach number profile appeared similar to the temperature profile, and the fluid was in the sonic region as long as temperature of the fluid dropped in the nozzle. Nusselt number ratios were compared with the Mach numbers and showed that the Nusselt number ratio were increased in the sonic region. The results showed that the length of the sonic region was larger for R123 than for R134a, and the Mach numbers were higher for R123. The Nusselt ratios of R123 were low compared to the R134a cases, and the trend in the Nusselt ratios was notably different as well.
KC, Amar. "Numerical Simulations of Magnetohydrodynamic Flow and Heat Transfer." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1411495287.
Повний текст джерелаShuai, Jianyun. "Flow boiling heat transfer in narrow vertical channels /." Göttingen : Cuvillier, 2004. http://bibpurl.oclc.org/web/38253.
Повний текст джерелаSouccar, Adham W. "Heat Transfer and Mass Transfer with Heat Generation in Drops at High Peclet Number." University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177603981.
Повний текст джерелаNguyen, Clayton Ma. "Heat transfer coefficients of particulate in tubular heat exchangers." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53960.
Повний текст джерелаLintern, Andrew Charles. "Applications of two-phase flow and heat transfer in compact heat exchangers." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/10549.
Повний текст джерелаLiuzzo, Scorpo Alberto. "Heat transfer in borehole heat exchangers and the contribution of groundwater flow." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/10123.
Повний текст джерелаThe exploitation of geothermal heat by ground source heat pumps is presently growing throughout Europe and the world. In Italy, at the end of 2010, borehole heat exchangers covered most of the 30% of the total energy used for space conditioning, showing an increase of 50%compared to 2005. The forecasts for 2015 suggest a further increase in the direct uses of the geothermal heat exceeding 50% compared to 2010 and a corresponding increase in the geothermal energy consumption. The possibility to design plants with higher efficiency and lower costs of installation and operation is required, to support the growth of the ground source heat pump systems and the consequent diffusion of the exploitation of the geothermal resources. Research and better knowledge of the processes involved in the heat transfer between the borehole heat exchanger and the surrounding ground is crucial to predict the behavior of the plant-geothermal source interaction in any possible operational condition. The knowledge of the hydrogeological characteristics of the specific site where the plant has to be installed is also essential to prevent over- or under-sizing of the heat exchanger(s) due to a rough design. Over the years, several analytical solutions have been proposed to calculate the temperature distribution around a borehole heat exchanger during operation. The infinite line source analytical model considers an infinite linear heat source which exchanges heat with the surrounding ground by conduction only. Other models, based on the infinite linear heat source, have been later developed, considering also the contribution to the conductive heat transfer due to groundwater flow. The presence of flowing water around a borehole heat exchanger implies forced convection, resulting in an increased efficiency of the heat transfer between the ground and the borehole heat exchanger. Studying this process may suggest new ways to improve the efficiency and to reduce the cost of ground source heat pump systems. In this thesis, the contribution of groundwater flow in the heat transfer process between borehole heat exchangers and surrounding ground has been investigated, in order to increase the theoretical knowledge as well as to improve the existing design tools. Two-dimensional models have been considered, taking into account the actual cylindrical geometry of the borehole. The groundwater flow has been modeled as steady, horizontal and with variable flow rates, in order to encompass most of the real ground source heat pump applications. Gravitational effects, i.e. the effects of a possible natural convection, have been neglected. The results suggest that in the considered range of Darcy number, the calculation of the heat transfer efficiency is not affected if Darcynian model is used to describe the velocity field, although the viscous effects, and consequently the formation of the hydraulic boundary layer, are neglected. Calculations made using numerical simulations are compared with an analytical solution which takes into account forced convection due to groundwater flow and based on the linear heat source model. The regions of space and time where this analytical solution is affected by the effects of the line source assumption, in both cases of single- and multiple-borehole(s) systems, have been defined. The potential of the thermal response test analysis as a tool to predict the spacing between boreholes when groundwater flow occurs has been investigated, defining and studying the Influence Length as function of groundwater flow rate. The results suggest that even relatively low flow rates allow to reduce significantly the spacing between boreholes in the perpendicular direction with respect to groundwater flow. The distance from the borehole where the temperature disturbance becomes not-significant (Influence Length) is roughly predictable by thermal response test analysis. The study of the Influence Length may be a useful tool in the design of dissipative multiple-boreholes systems, as well as in areas with a high density of single-borehole plants, to reduce the spacing avoiding thermal interferences. Moreover, an expeditious, graphical method to estimate the hydraulic conductivity of the ground by thermal response test analysis has been proposed. An example of application of the methodology is presented, taking into account experimental data as well as plausible hydrological and petrological assumptions when the data are unavailable. The obtained result is in agreement with the hydraulic conductivity range reported in literature for the type of substrate considered in the example. In order to verify this method, further inv1estigations and developments are required. In fact, the graphs used in the procedure presented in this work are referred to specific borehole conditions (borehole filled by groundwater) and are based on two-dimensional models (i.e. end-effects and natural convection are neglected). Besides, the assumptions required to compensate the unavailable data imply that the method cannot be considered verified. Finally, further studies are suggested in order to improve and develop the proposed methods.
Negli ultimi anni, l’utilizzo del calore geotermico tramite pompe di calore accoppiate al terreno sta aumentando significativamente in tutta Europa e in generale nel mondo. In Italia, alla fine del 2010, le sonde geotermiche coprivano più del 30% dell’energia totale utilizzata per riscaldamento e raffrescamento degli edifici, mostrando un aumento del 50% rispetto al 2005. Le previsioni per il 2015 suggeriscono un ulteriore aumento degli utilizzi diretti del calore geotermico maggiore del 50% rispetto al 2010 e un analogo incremento del consumo di energia geotermica in generale. Con l’aumento della diffusione di questa tecnologia, e quindi un maggior sfruttamento di tale risorsa, aumenta anche la necessità di progettare impianti con la massima efficienza possibile e con bassi costi di installazione ed esercizio. La comprensione dei processi coinvolti nel trasferimento di calore tra sonda geotermica e terreno circostante è fondamentale per prevedere il comportamento degli impianti. Anche la conoscenza delle caratteristiche idrogeologiche del sito specifico nel quale l’impianto deve essere installato è essenziale al fine di evitare un’errata progettazione che può causare sovra- o sotto-dimensionamento della sonda. Nel corso degli anni, diverse soluzioni analitiche sono state proposte per calcolare la distribuzione di temperatura attorno alla sonda geotermica durante il suo utilizzo. Il modello analitico della sorgente di calore lineare e infinita considera lo scambio di calore che avviene per sola conduzione attorno ad una sorgente di raggio infinitesimo e di lunghezza infinita. Altri modelli successivi a questo e anch’essi basati sulla sorgente di calore lineare ed infinita, tengono conto anche del contributo convettivo dovuto al flusso dell’acqua di falda. La presenza di un flusso di acqua attorno ad una sonda geotermica, infatti, comporta convezione forzata e, di conseguenza, un aumento dello scambio di calore tra sonda e terreno. Per questo motivo, lo studio degli effetti di tale processo è un fattore chiave per riuscire a migliorare l’efficienza degli scambiatori di calore accoppiati al terreno. Questa tesi presenta lo studio del contributo del flusso delle acque di falda sul processodi scambio termico tra sonde geotermiche e terreno circostante, al fine di incrementare la conoscenza teorica e migliorare gli strumenti di progettazione già esistenti. Per raggiungere questo scopo ci si è serviti di modelli numerici bi-dimensionali che tengono conto della reale geometria cilindrica della sonda. Il fusso delle acque di falda è stato assunto come stazionale e orizzontale. Al fine di includere la maggior parte delle applicazioni geotermiche reali, un vasto range di portate è stato preso in considerazione. Gli effetti gravitativi, e quindi i possibili effetti di convezione naturale, sono stati invece trascurati. Sono stati confrontati i risultati del calcolo del trasferimento di calore ottenuti utilizzando rispettivamente l’equazione di Darcy e l’equazione di Darcy-Brinkman per descrivere il campo di velocità dell’acqua di falda attorno alla sonda. Le conclusioni raggiunte suggeriscono che utilizzando il modello di Darcy, il risultato risulta comunque sufficientemente accurato per i numeri di Darcy considerati, nonostante gli effetti viscosi, e quindi la formazione dello strato-limite fluidodinamico, vengano trascurati. I risultati delle simulazioni numeriche sono stati comparati con un modello analitico che prevede convezione forzata, dovuta al flusso di falda, attorno ad una sorgente di calore lineare ed infinita. Sono quindi state definite le regioni dello spazio e del tempo dove tale soluzione analitica è soggetta agli effetti della linearit`a della sorgente, sia nel caso di sonda singola, sia nel caso di campo-sonde. Sono inoltre state studiate le potenzialità dell’analisi del test di risposta termica come strumento per prevedere la spaziatura tra le sonde in funzione della portata del flusso dell’acqua di falda. I risultati suggeriscono che portate relativamente modeste, permettono una riduzione significativa della spazitura tra le sonde in direzione perpendicolare rispetto a quella di scorrimento dell’acqua di falda. Sfruttando l’analisi del test di risposta termica, è possibile stimare approssimativamente la distanza dalla sonda alla quale il disturbo di temperatura diventa trascurabile (distanza di influenza). Lo studio di questa distanza di influenza pu`o essere un utile strumento per la progettazione di sistemi dissipativi composti da sonde multiple, così come nelle aree con un’alta densità di impianti a sonda singola, al fine di ridurre la spaziatura tra le sonde, evitando allo stesso tempo l’insorgere di interferenze termiche tra sonde adiacenti. Inoltre è stato proposto un metodo grafico e speditivo per la stima della conducibilità idraulica del substrato tramite l’analisi del test di risposta termica. È stato presentato un esempio dell’applicazione di questa metodologia utilizzando sia dati sperimentali sia assunzioni plausibili di carattere idrologico e petrologico, quando non è stato possibile avvalersi di dati sperimentali. I risultati ottenuti sono in accordo con i valori di conducibilità idraulica proposti in letteratura per il tipo di substrato dell’esempio. Per poter verificare l’affidabilità di questo metodo, ulteriori studi e sviluppi sono sono necessari. Infatti, i grafici utilizzati nella procedura presentata in questa tesi, si riferiscono a specifiche condizioni della sonda (acqua di falda come materiale di riempimento) e sono inoltre basati su modelli bi-dimensionali (trascurando quindi gli effetti di fine-pozzo e il contributo della convezione naturale). Infine vengono forniti suggerimenti riguardo ulteriori studi che consentirebbero di migliorare e sviluppare ulteriormente le metodologie proposte.
XXVI Ciclo
1985
Holzaepfel, Gregory M. "Convective Heat Transfer in Parallel Plate Heat Sinks." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1292521397.
Повний текст джерелаAlfama, Marco. "Theoretical and experimental investigation of the heat transfer and pressure drop optimisation on textured heat transfer surfaces." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62792.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2017.
Mechanical and Aeronautical Engineering
MEng
Unrestricted
Kota, Siva Kumar k. "Analysis of Heat Transfer Enhancement in Channel Flow through Flow-Induced Vibration." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062854/.
Повний текст джерелаSulaiman, M. Y. "Performance characteristics of compact heat transfer surfaces." Thesis, University of Brighton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364712.
Повний текст джерелаRojas-Menendez, Jorge Antonio. "Flow and heat transfer characteristics of diffusing curved ducts." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38148.
Повний текст джерелаMatys, Paul. "Fluid flow and heat transfer in continuous casting processes." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28504.
Повний текст джерелаApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Flaxman, Robert J. "Flow and heat transfer in a drop tube furnace." Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/4838.
Повний текст джерелаSaha, Goutam. "Heat transfer performance investigation of nanofluids flow in pipe." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7559/.
Повний текст джерелаEccles, Errol R. A. (Errol Ray Antonio). "Flow and heat transfer phenomena in aerated vibrated beds." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74281.
Повний текст джерелаAligoodarz, M. R. "Flow boiling heat transfer in a single narrow channel." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298767.
Повний текст джерелаBarber, Jacqueline Claire. "Hydrodynamics, heat transfer and flow boiling instabilities in microchannels." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4000.
Повний текст джерелаChang, T. H. "An investigation of turbulent swirling flow with heat transfer." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636228.
Повний текст джерелаHouston, Stephen Douglas. "Tube-side flow and heat transfer in package boilers." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/804.
Повний текст джерелаKelly, Barry P. "Liquid-particle heat transfer in two phase flow systems." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286853.
Повний текст джерелаBall, Stephen. "Near wall flow characteristics in jet impingement heat transfer." Thesis, Nottingham Trent University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388866.
Повний текст джерелаNOGUEIRA, ANTONIO CARLOS RIBEIRO. "HEAT TRANSFER IN TURBULENT SWIRL FLOW THROUGH RECTANGULAR DUCTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24953@1.
Повний текст джерелаO presente trabalho investigou numericamente e experimentalmente as características de transferência de calor e queda de pressão de um escoamento espiralado, turbulento, de caindo através de um duto retangular de elevada razão de aspecto. A condição de escoamento espiralado na estrada do duto foi obtida por meio de tubos paralelos contendo fitas torcidas de modo a produzir vórtices girando em sentidos opostos, dois a dois. Coeficientes de transferência de calor locais e médios foram determinados através da utilização da técnica de sublimação de naftaleno em conjunto com a anologia entre processos de transferência de calor e massa. Os valores locais foram medidos sobre toda a superfície ativa do duto, com o auxílio de uma mesa de coordenadas controlada por microcomputador. Resultados para os coeficientes transferência de calor e da queda de pressão foram obtidas para três valores do número de Reynolds do duto e para três valores da intensidade do escoamento espiralado, dados pela utilização de fitas torcidas com diferentes relações de passo/diâmetro. Para posições axiais próximas da entrada do duto, os resultados revelaram altas taxas de aumento na transferência de calor, relativamente ao caso base, representado por escoamento turbulento sem a imposição do escoamento espiralado. Os resultados para a queda de pressão demonstraram que a presença da componente tangencial da velocidade do escoamento espiralado imposto reduziu os efeitos de recuperação de pressão existentes na região de entrada de dutos com entrada abrupta. Foi também verificado que o comprimento de desenvolvimento hidrodinâmico do escoamento aumenta com a intensidade do escoamento espiralado. As equações de conservação de massa , movimento linear e energia, incorporadndo o modelo de turbulência K – E foram resolvidas numericamente para a configuração em estudo. Os resultados numéricos apresentaram boa concordância com os experimentos, permitindo a
The presente work investigated experimentally and numerically the heat transfer and pressure drop characteristics of turbulent decaying swirl flows through a rectangular duct of high aspect ratio. The swirl flow inlet condition was obtained by a set of parallel tubes with twisted-tape inserts wich produced pairs of counterrotating vortices. Local and average heat transfer coefficients were determined by the utilization of the naphthalene sublimation technique in conjunction with the analogy between heat and mass transfer. Local result were obtained along the whole active surface of the duct, utilizing a computer-assisted coordinate table and depth gage. The study encompassed the investigation of the local and average heat transfer coefficient distribution and pressure drop, for three values of the duct Reynolds number, and for three values of the swirl intensity given by different tape pitch-to-diameter rations. The results showed regions of high heat transfer augmentation situated close to the entrance of the duct, when compared to the base case results characterized by turbulent flow through a duct without the swirl flow inlet condition. The pressure drop results demonstrated that the presence of the tangencial velocity component of the imposed swirl flow was seen to reduce the pressure recover effect present in sharp-edged entrance ducts. It was also verifyied that the hydroninamic developing length increases with the intensity of the swirl flow. The equations governing conservation of mass, linear momentum and energy were solved numerically for the configuration investigated. The K-E turbulence model was employed. The numerical results displayed good agreement with the experiments and provided additional information related to velocity and temperature fields which complemented the experimental program.
Lewis, Paul. "Pre-swirl rotor-stator systems : flow and heat transfer." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516951.
Повний текст джерелаWells, Robert G. "Laminar flow with an axially varying heat transfer coefficient." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101333.
Повний текст джерелаM.S.
Zeng, Yiyun. "Flow and heat transfer in pressurised water reactor reflood." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6046.
Повний текст джерелаJanakiraman, S. V. "Fluid flow and heat transfer in transonic turbine cascades." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06112009-063614/.
Повний текст джерелаCortina, Díaz Marta. "Flow boiling heat transfer and visualization in narrow channels /." Düsseldorf : VDI-Verl, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017035574&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Повний текст джерелаMcPhail, Stephen John. "Single-phase fluid flow and heat transfer in microtubes." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-36182.
Повний текст джерела