Download or read book COMPUTATIONAL METHODS FOR THE INVESTIGATION OF LIQUID DROP PHENOMENA IN EXTERNAL GAS FLOWS written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Computational methods for the investigation of drop deformation, drop breakup and drop solidification are developed and implemented in the open source computing environment OpenFOAM® [63]. The goal of this research is to simulate these drop phenomena by resolving all the relevant time and length scales in order to obtain correlations and statistical information which then can be used in the modeling of dispersed multiphase flows such as sprays. The use of such models is central for the simulation of dispersed multiphase flows because present-day computational technology does not have the capacity to resolve millions of droplets, as is typically encountered in sprays. There are three aspects to this thesis. Three types of simulations are performed. First, the two-phase flow solver, interFoam, is modified to allow for simulating a moving droplet in an external airflow within a fixed computational domain. The modified solver is then used for the modeling and simulation of deformation and breakup of drops in axisymmetric and three dimensional symmetric flows, and the results are utilized to validate drop deformation and breakup theories, and to derive statistical information for the product drop size distributions in the various flow regimes. The Taylor Analogy Breakup (TAB) model has been modified and this modified TAB model is also presented and validated. Second, the feasibility and accuracy of calculating convective heat transfer coefficients using CFD is studied for two test cases: the flow between parallel flat plates and the flow past a cylinder. The feasibility and accuracy is demonstrated and achieved by comparing the results with the literature. Third, for the investigation of the solidification of drops, an enhanced enthalpy- porosity model [6] is presented and implemented into OpenFOAM® to form a new solver, modPolyMeltFoam. Two test cases are used to validate the model and its implementation: the pure natural convection of water in a cavity and the solidification of water in a cavity. These tests show that the code performs very well comparing with results from the literature. The code is then coupled with the conjugate heat transfer solver, chtMultiRegionFoam, to create the solver modFluidFluidChtMultiRegionFoam which is able to simulate a stationary water droplet solidifying in a cold airflow. The results of the solidification studies are used to obtain correlations for the convective heat transfer coefficients, which in turn can be utilized in the modeling of freezing sprays where the solidification of millions of droplets needs to be described.

Download or read book Computational heat and mass transfer CHMT 2001 Vol I written by and published by Editora E-papers. This book was released on with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Complex Liquid gas Interfacial Flows written by Sagar Pal and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamics of liquid-gas interfacial flows play a critical role in several processes in nature, as well as in myriad industrial applications. Key elements of surface tension dominated flows such as droplets and bubbles constitute the fundamental mechanisms governing the exchange of heat and mass at the ocean-atmosphere interface, conventional modes of heat transfer and ever so importantly, the transmission of pathogens. One of the most fascinating features of multiphase flows is the process of atomization, in which a liquid volume breaks into smaller fragments via a series of topological changes of varying complexity, ultimately resulting in the emergence of drops of various sizes. The present body of work is composed of numerical investigations pertaining to two different aspects of liquid-gas interfacial flows involving marked density contrasts, carried out with the aid of advanced geometrical reconstruction based Volume-of-Fluid methods. The first aspect involves understanding and eventually suppressing certain types of instabilities that plague standard numerical models due to the cascading growth of discretization errors that are rampant at low to moderate numerical resolution. Finally, the second aspect of the investigation deals with a statistical description of drop sizes, where the drops are generated by carrying out large ensembles of well resolved direct numerical simulations of the capillary-induced breakup of randomly corrugated ligaments.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Resolution Methods for Incompressible and Low Speed Flows written by D. Drikakis and published by Springer. This book was released on 2009-09-02 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of incompressible ?ows is vital to many areas of science and te- nology. This includes most of the ?uid dynamics that one ?nds in everyday life from the ?ow of air in a room to most weather phenomena. Inundertakingthesimulationofincompressible?uid?ows,oneoftentakes many issues for granted. As these ?ows become more realistic, the problems encountered become more vexing from a computational point-of-view. These range from the benign to the profound. At once, one must contend with the basic character of incompressible ?ows where sound waves have been analytically removed from the ?ow. As a consequence vortical ?ows have been analytically “preconditioned,” but the ?ow has a certain non-physical character (sound waves of in?nite velocity). At low speeds the ?ow will be deterministic and ordered, i.e., laminar. Laminar ?ows are governed by a balance between the inertial and viscous forces in the ?ow that provides the stability. Flows are often characterized by a dimensionless number known as the Reynolds number, which is the ratio of inertial to viscous forces in a ?ow. Laminar ?ows correspond to smaller Reynolds numbers. Even though laminar ?ows are organized in an orderly manner, the ?ows may exhibit instabilities and bifurcation phenomena which may eventually lead to transition and turbulence. Numerical modelling of suchphenomenarequireshighaccuracyandmostimportantlytogaingreater insight into the relationship of the numerical methods with the ?ow physics.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1969 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Download or read book The Engineering Index Annual written by and published by . This book was released on 1993 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.

Download or read book Computational Methods for Unsteady Compressible Gas Flows written by J. D. Ledger and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fluid Dynamics at Interfaces written by Wei Shyy and published by Cambridge University Press. This book was released on 1999-09-28 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book experts discuss research and applications in interfacial fluid dynamics.

Download or read book Process Intensification written by Mirko Skiborowski and published by Walter de Gruyter GmbH & Co KG. This book was released on 2022-10-03 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Process intensification aims for increasing efficiency and sustainability of (bio-)chemical production processes. The second book of our two-book series focusses entirely on process intensifi cation by centrifugally enhanced (reactive) separations. The book provides an overview of the main applications of rotating packed beds (RPBs) in liquid-liquid, gas-liquid and vapor-liquid contacting, within academic research and industrial applications. The book addresses current design rules and modeling frameworks, including the tailored design of functional packings by means of additive manufacturing. Rotating packed beds are widely applicable and fl exible mass transfer machines for process intensifi cation. Applications, design rules and advanced modeling for rotating packed beds are presented in an interconnected way.

Download or read book Some Computational Methods for Fluid Flows written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Process and Chemical Engineering written by and published by . This book was released on 1995 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts written by and published by . This book was released on 1963 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstracts of dissertations and monographs in microform.