Download or read book Flow Field and Heat Transfer in Swirling Impinging Jets written by Andrea Ianiro and published by . This book was released on 2011 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Transfer from Swirling Impinging Jets written by and published by . This book was released on 1904 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concerned with the determination of the local and average mass/heat transfer--from swirling jets impinging orthogonally onto flat surfaces. ApplicatioCn> of swirl alters the flow field of the' jet considerably and eventually the maximum velocity in the jet is displaced from the axis resulting in a typical 'double-peak' profile. Further increase of swirl, can even result in a recirculation in the inner core of the flow. The turbulence characteristics of the jet are also affected. it is expected that these changes will, in addition, modify the heat transfer behaviour. Consequently, a study of both single free jets and a square array (of 3x 3) of jets was undertaken. The range of swirls examined in this study was from zero through to weak and then medium swirl, i. e. the swirl number S was varied from 0 to 0.48. The other parameters varied in the experiments were the nozzle-to-target spacing z/D from 2 to 12, the nozzle pitches x/D (for arrays of jets) which were 3.2,4.8 and 6.4, and the jGt Reynolds number. In the single frce jet tests, two flow rates corresponding to ReD-":2 32pOOO and 60,000 were studied whilst, for the 'multiple' jets, the measurements were confined. to the lower of these Reynolds numbers. (ReD is based on the mean exit velocity in the non-swirling case and the diameter of the nozzle.) Limited velocity and turbulence measurements were also undertaken on the single jet to characterise the flow and also to compare the behaviour of the present jets with those in previous studies. The flows were similar to those observed previously for swirling jets so that the heat transfer results should be generally applicable. A 'thin-film' naphthalene sublimation technique was used to measure mass transfers over the target surface. The heat transfer coefficients were then derived using the Chilton-Colburn analogy. A rig was developed to spray a uniform coating of naphthalene on the target surface. This 'thin-film' technique was found to provide re.

Download or read book Heat Transfer from Swirling Impinging Jets written by M. Mahmood and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is concerned with the determination of thelocal and average mass/heat transfer--from swirling jetsimpinging orthogonally onto flat surfaces. ApplicatioCn>of swirl alters the flow field of the jet considerablyand eventually the maximum velocity in the jet is displacedfrom the axis resulting in a typical double-peak profile. Further increase of swirl, can even result in arecirculation in the inner core of the flow. The turbulencecharacteristics of the jet are also affected. itis expected that these changes will, in addition, modifythe heat transfer behaviour. Consequently, a study of both single free jets and asquare array (of 3x 3) of jets was undertaken. Therange of swirls examined in this study was from zerothrough to weak and then medium swirl, i. e. the swirlnumber S was varied from 0 to 0.48. The other parametersvaried in the experiments were the nozzle-to-targetspacing z/D from 2 to 12, the nozzle pitches x/D (forarrays of jets) which were 3.2,4.8 and 6.4, and the jGtReynolds number. In the single frce jet tests, two flowrates corresponding to ReD-":2 32pOOO and 60,000 were studiedwhilst, for the multiple jets, the measurementswere confined. to the lower of these Reynolds numbers.(ReD is based on the mean exit velocity in the non-swirlingcase and the diameter of the nozzle.)Limited velocity and turbulence measurements were alsoundertaken on the single jet to characterise the flowand also to compare the behaviour of the present jetswith those in previous studies. The flows were similarto those observed previously for swirling jets so thatthe heat transfer results should be generally applicable. A thin-film naphthalene sublimation technique was usedto measure mass transfers over the target surface. Theheat transfer coefficients were then derived using theChilton-Colburn analogy. A rig was developed to spraya uniform coating of naphthalene on the target surface. This thin-film technique was found to provide repeatableresults and the validity of the experiments was further assessed by comparing the results with previouslypublished data for the no swirl case. These were inreasonable agreement. For the single free jets, the application of swirl wasfound to continuously reduce the heat transfers. Theheat transfers, however, became more uniform. An empiricalcorrelation has also been suggested for the averageNusselt number associated with these single swirling jets and is valid for S= 0.12-to 0.48. In some circumstancesin the multiple jet tests (e. g. at close nozzle-to-target spacings) the average heat transfers increasedto a maximum of IS =0.24 (approximately). Further increasesin the degree of swirl brought about a subsequentreduction in average heat transfer coefficients untileventually the performance of the swirling jets was poorerthan that of the non-swirling flows. This discrepancyin behaviour can be explained in terms of changes in thelocal heat transfer distributions.

Download or read book Heat Transfer and Flow Visualization of Conventional and Swirling Impinging Jets written by Lianmin Huang and published by . This book was released on 1996 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of flow and heat transfer characteristics in a swirling impinging jet written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: O presente trabalho é um estudo experimental das características de um escoamento de ar em forma de jato espiralado, incidindo ortogonalmente sobre uma placa. Os objetivos do estudo são: avaliar a influência da presença de uma componente circunferencial de velocidade na distribuição dos coeficientes locais de troca de calor, obter campos de velocidade instantâneos no plano axissimétrico assim como informações sobre as características da turbulência no escoamento. Durante os experimentos se investigou a influência da distância jato/placa e da intensidade do escoamento espiralado (número de Swirl). Como etapa preliminar, foi conduzido um experimento de jato livre, para validação das técnicas de medição de velocidade utilizadas. Os resultados foram comparados com os da literartura e uma boa concordância foi obtida. A distribuição espacial dos coeficientes de troca de calor foi avaliada impondo-se um fluxo de calor constante na placa e medindo a distribuição radial de temperatura através de diversos termopares. Coeficientes locais puderam então ser estimados. Os campos de velocidades radial e axial instantâneos foram adquiridos experimentalmente através da utilização da técnica de Particle Image Velocimetry (PIV) e perfis de velocidade tangencial (média e flutuações) foram obtidos a partir da técnica Laser Doppler Velocimetry (LDV). Os resultados mostraram que os padrões de escoamento mudam significativamente quando a componente circunferencial de velocidade é introduzida. Para o valor mais alto do Número de Swirl foram verificadas fortes reversões do escoamento na região de estagnação.

Download or read book Prediction of Flow and Heat Transfer Under a Laminar Swirling Impinging Jet written by Bing Huang and published by . This book was released on 1977 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impingement Jet Cooling in Gas Turbines written by R.S. Amano and published by WIT Press. This book was released on 2014-05-28 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the requirement for enhanced cooling technologies on modern gas turbine engines, advanced research and development has had to take place in field of thermal engineering. Among the gas turbine cooling technologies, impingement jet cooling is one of the most effective in terms of cooling effectiveness, manufacturability and cost. The chapters contained in this book describe research on state-of-the-art and advanced cooling technologies that have been developed, or that are being researched, with a variety of approaches from theoretical, experimental, and CFD studies. The authors of the chapters have been selected from some of the most active researchers and scientists on the subject. This is the first to book published on the topics of gas turbines and heat transfer to focus on impingement cooling alone.

Download or read book Food Engineering Integrated Approaches written by Gustavo F. Gutiérrez-Lopez and published by Springer Science & Business Media. This book was released on 2008-02-29 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a significant and up-to-date review of various integrated approaches to food engineering. Distinguished food engineers and food scientists from key institutions worldwide have contributed chapters that provide a deep analysis of their particular subjects. Emerging technologies and biotechnology are introduced, and the book discusses predictive microbiology, packing materials for foods, and biodegradable films. This book is mainly directed to academics, and to undergraduate and postgraduate students in food engineering and food science and technology, who will find a selection of topics.

Download or read book Proceedings Of The International Heat Transfer Conference written by Lee and published by CRC Press. This book was released on 1998-11-01 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: This year's set of papers includes 23 Keynote Papers and 537 refereed General Papers, in seven volumes. Experts from around the world have combined to address the leading edge of research and practical innovations in convection, combustion, heat exchangers, two-phase flow, and much more. Whether one is involved in mechanical, chemical, nuclear, or energy engineering the quantity, international scope, and high quality of the contents make access to these volumes essential.

Download or read book Turbulent Impinging Jets into Porous Materials written by Marcelo J.S. de Lemos and published by Springer Science & Business Media. This book was released on 2012-04-23 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This short book deals with the mathematical modeling of jets impinging porous media. It starts with a short introduction to models describing turbulences in porous media as well as turbulent heat transfer. In its main part, the book presents the heat transfer of impinging jets using a local and a non-local thermal equilibrium approach.

Download or read book The Flow Development and Heat Transfer Characteristics of Plane Turbulent Impinging Jets written by J. J. Schauer and published by . This book was released on 1963 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Performance Computing in Science and Engineering 08 written by Wolfgang E. Nagel and published by Springer Science & Business Media. This book was released on 2009-01-10 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discussions and plans on all scienti?c, advisory, and political levels to realize an even larger “European Supercomputer” in Germany, where the hardware costs alone will be hundreds of millions Euro – much more than in the past – are getting closer to realization. As part of the strategy, the three national supercomputing centres HLRS (Stuttgart), NIC/JSC (Julic ̈ h) and LRZ (Munich) have formed the Gauss Centre for Supercomputing (GCS) as a new virtual organization enabled by an agreement between the Federal Ministry of Education and Research (BMBF) and the state ministries for research of Baden-Wurttem ̈ berg, Bayern, and Nordrhein-Westfalen. Already today, the GCS provides the most powerful high-performance computing - frastructure in Europe. Through GCS, HLRS participates in the European project PRACE (Partnership for Advances Computing in Europe) and - tends its reach to all European member countries. These activities aligns well with the activities of HLRS in the European HPC infrastructure project DEISA (Distributed European Infrastructure for Supercomputing Appli- tions) and in the European HPC support project HPC-Europa. Beyond that, HLRS and its partners in the GCS have agreed on a common strategy for the installation of the next generation of leading edge HPC hardware over the next ?ve years. The University of Stuttgart and the University of Karlsruhe have furth- more agreed to bundle their competences and resources.

Download or read book Prediction of Heat Transfer and Flow Fields in Submerged and Confined Axisymmetric Impinging Jets written by Garron Koch Morris and published by . This book was released on 1996 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Survey of Literature on Flow Characteristics of a Single Turbulent Jet Impinging on a Flat Plate written by James W. Gauntner and published by . This book was released on 1970 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow characteristics of single jets impinging on flat surfaces have been studied by many investigators. The results of some of the numerous studies are summarized herein. Suggested methods for determining velocities and pressures on which to base heat-transfer correlations for use in impingement cooling design are presented.

Download or read book Tackling Turbulent Flows in Engineering written by Anupam Dewan and published by Springer Science & Business Media. This book was released on 2010-10-23 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emphasis of this book is on engineering aspects of fluid turbulence. The book explains for example how to tackle turbulence in industrial applications. It is useful to several disciplines, such as, mechanical, civil, chemical, aerospace engineers and also to professors, researchers, beginners, under graduates and post graduates. The following issues are emphasized in the book: - Modeling and computations of engineering flows: The author discusses in detail the quantities of interest for engineering turbulent flows and how to select an appropriate turbulence model; Also, a treatment of the selection of appropriate boundary conditions for the CFD simulations is given. - Modeling of turbulent convective heat transfer: This is encountered in several practical situations. It basically needs discussion on issues of treatment of walls and turbulent heat fluxes. - Modeling of buoyancy driven flows, for example, smoke issuing from chimney, pollutant discharge into water bodies, etc

Download or read book The Flow Development and Heat Transfer Characteristics of Plane Turbulent Impinging Jets written by John Joseph Schauer and published by . This book was released on 1963 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparison of Full Surface Local Heat Transfer Coefficient and Flow Field Studies Beneath Sharp Edged and Radiused Entry Impinging Jets written by D. R. H. Gillespie and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: