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Analysis Of Molecular Mixing And Chemical Reaction In Mixing Layer
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Book Synopsis Analysis of Molecular Mixing and Chemical Reaction in Mixing Layer by : B. M. Cetegen
Download or read book Analysis of Molecular Mixing and Chemical Reaction in Mixing Layer written by B. M. Cetegen and published by . This book was released on 1988 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper concerns an analytical study of molecular mixing and finite rate chemical reactions in an infinite row of vortices representing a mixing layer. Diffusion equations for reacting and non-reacting species are solved locally in the Lagrangian frame of reference following material elements. The flowfield is a given for the problem. The concentration distributions in the vortex structure are composed from these analytical solutions and presented for several cases. The probability density functions constructed from these distributions are compared with the mixing layer experiments. For the cases studied, the comparisons indicate encouraging agreement for the reacting flow case. However, some differences are present for the non-reacting flows. Keywords: Turbulent reacting flows; Molecular mixing, Reaction in vortical structures.
Book Synopsis Turbulence in Mixing Operations by : Robert Brodkey
Download or read book Turbulence in Mixing Operations written by Robert Brodkey and published by Elsevier. This book was released on 2012-12-02 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence in Mixing Operations: Theory and Application to Mixing and Reaction presents a summary of the current status of research on turbulent motion, mixing, and kinetics. Each chapter of this book discusses turbulence in the context of mixing and reaction in scalar fields. Chapters I and III discuss the classification of turbulent reacting systems and the different possibilities in this context. Chapter II reviews the properties of passive mixing. Chapter IV looks at turbulent mixing in chemically reactive flows. Chapter V uses different techniques to make parallel numerical calculations of both mixing and reaction. Finally, Chapter VI reviews turbulence and actual industrial mixing operations. This book will be of great value for chemical and industrial engineers, especially for those interested in turbulent and industrial mixing.
Book Synopsis Turbulent Mixing and Chemical Reactions by : Jerzy Bałdyga
Download or read book Turbulent Mixing and Chemical Reactions written by Jerzy Bałdyga and published by John Wiley & Sons. This book was released on 1999-03-12 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent Mixing and Chemical Reactions Jerzy Ba???dyga, Warsaw University of Technology, Poland John R. Bourne, Visiting Professor, University of Birmingham, UK and Emeritus Professor, ETH Zurich, Switzerland The way in which reagents are mixed can greatly influence the yield and range of products formed by fast, multiple chemical reactions. Understanding this phenomenon enables chemists to carry out reactions more selectively, make better use of raw materials and simplify product workup and separation. Turbulent Mixing and Chemical Reactions presents a balanced treatment of the connection between mixing and reaction. It contains theoretical aspects, experimental methods and expected results as well as worked examples to illustrate problem solving. This book will be of interest to all scientists involved in chemical engineering, physical chemistry, and synthetic chemists in the fine chemical and pharmaceuticals industry.
Book Synopsis Experimental and Numerical Study of Molecular Mixing Dynamics in Rayleigh-Taylor Unstable Flows by : Nicholas J. Mueschke
Download or read book Experimental and Numerical Study of Molecular Mixing Dynamics in Rayleigh-Taylor Unstable Flows written by Nicholas J. Mueschke and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments and simulations were performed to examine the complex processes that occur in Rayleigh-Taylor driven mixing. A water channel facility was used to examine a buoyancy-driven Rayleigh-Taylor mixing layer. Measurements of fluctuating density statistics and the molecular mixing parameter [theta] were made for Pr = 7 (hot/cold water) and Sc ~ 103 (salt/fresh water) cases. For the hot/cold water case, a high-resolution thermocouple was used to measure instantaneous temperature values that were related to the density field via an equation of state. For the Sc ~ 103 case, the degree of molecular mixing was measured by monitoring a diffusion-limited chemical reaction between the two fluid streams. The degree of molecular mixing was quantified by developing a new mathematical relationship between the amount of chemical product formed and the density variance /pr2. Comparisons between the Sc = 7 and Sc ~ 103 cases are used to elucidate the dependence of [theta] on the Schmidt number. To further examine the turbulent mixing processes, a direct numerical simulation (DNS) model of the Sc = 7 water channel experiment was constructed to provide statistics that could not be experimentally measured. To determine the key physical mechanisms that influence the growth of turbulent Rayleigh-Taylor mixing layers, the budgets of the exact mean mass fraction ~m1, turbulent kinetic energy ~E", turbulent kinetic energy dissipation rate ~e", mass fraction variance ~m1"2, and mass fraction variance dissipation rate ~x" equations were examined. The budgets of the unclosed turbulent transport equations were used to quantitatively assess the relative magnitudes of different production, dissipation, transport, and mixing processes. Finally, three-equation (~E"~-e"~-m1"2) and four-equation (~E"~-e"~-m1"2~-X") turbulent mixing models were developed and calibrated to predict the degree of molecular mixing within a Rayleigh-Taylor mixing layer. The DNS data sets were used to assess the validity of and calibrate the turbulent viscosity, gradient-diffusion, and scale-similarity closures a priori. The modeled transport equations were implemented in a one-dimensional numerical simulation code and were shown to accurately reproduce the experimental and DNS results a posteriori. The calibrated model parameters from the Sc = 7 case were used as the starting point for determining the appropriate model constants for the mass fraction variance ~m1"2 transport equation for the Sc ~ 103 case.
Book Synopsis Micro and Macro Mixing by : Henning Bockhorn
Download or read book Micro and Macro Mixing written by Henning Bockhorn and published by Springer Science & Business Media. This book was released on 2009-12-26 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: The homogenization of single phase gases or liquids with chemical reactive components by mixing belongs to one of the oldest basic operations applied in chemical engineering. The mixing process is used as an essential step in nearly all processes of the chemical industry as well as the pharmaceutical and food ind- tries. Recent experimentally and theoretically based results from research work lead to a fairly good prediction of the velocity fields in differend kinds of mixers, where as predictions of simultaneously proceeding homogeneous chemical re- tions, are still not reliable in a similar way. Therefore the design of equipment for mixing processes is still derived from measurements of the so called “mixing time” which is related to the applied methods of measurement and the special - sign of the test equipment itself. The cooperation of 17 research groups was stimulated by improved modern methods for experimental research and visualization, for simulations and nume- cal calculations of mixing and chemical reactions in micro and macro scale of time and local coordinates. The research work was financed for a six years period within the recently finished Priority Program of the German Research Foundation (DFG) named “Analysis, modeling and numerical prediction of flow-mixig with and without chemical reactions (SPP 1141)”. The objective of the investigations was to improve the prediction of efficiencies and selectivities of chemical re- tions on macroscopic scale.
Book Synopsis Turbulent Mixing in Nonreactive and Reactive Flows by : S. Murthy
Download or read book Turbulent Mixing in Nonreactive and Reactive Flows written by S. Murthy and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence, mixing and the mutual interaction of turbulence and chemistry continue to remain perplexing and impregnable in the fron tiers of fluid mechanics. The past ten years have brought enormous advances in computers and computational techniques on the one hand and in measurements and data processing on the other. The impact of such capabilities has led to a revolution both in the understanding of the structure of turbulence as well as in the predictive methods for application in technology. The early ideas on turbulence being an array of complicated phenomena and having some form of reasonably strong coherent struc ture have become well substantiated in recent experimental work. We are still at the very beginning of understanding all of the aspects of such coherence and of the possibilities of incorporating such structure into the analytical models for even those cases where the thin shear layer approximation may be valid. Nevertheless a distinguished body of "eddy chasers" has come into existence. The structure of mixing layers which has been studied for some years in terms of correlations and spectral analysis is also getting better understood. Both probability concepts such as intermittency and conditional sampling as well as the concept of large scale structure and the associated strain seem to indicate possibilities of distinguishing and synthesizing 'engulfment' and molecular mixing.
Book Synopsis Mixing and Non-equilibrium Chemical Reaction in a Compressible Mixing Layer by : Craig J. Steinberger
Download or read book Mixing and Non-equilibrium Chemical Reaction in a Compressible Mixing Layer written by Craig J. Steinberger and published by . This book was released on 1991 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis An Experimental Investigation of Mixing and Chemical Reaction in a Plane Mixing Layer by : Stephen Masao Masutani
Download or read book An Experimental Investigation of Mixing and Chemical Reaction in a Plane Mixing Layer written by Stephen Masao Masutani and published by . This book was released on 1985 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of Molecular Mixing in a High Schmidt Number Rayleigh-Taylor Mixing Layer by :
Download or read book Measurements of Molecular Mixing in a High Schmidt Number Rayleigh-Taylor Mixing Layer written by and published by . This book was released on 2007 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular mixing measurements are performed for a high Schmidt number (Sc (almost equal to) 103), small Atwood number (A (almost equal to) 7.5 x 10−4) buoyancy-driven turbulent Rayleigh-Taylor mixing layer in a water channel facility. Salt was added to the top stream to create the desired density difference. The degree of molecular mixing was measured as a function of time by monitoring a diffusion-limited chemical reaction between the two fluid streams. The pH of each stream was modified by the addition of acid or alkali such that a local neutralization reaction occurred as the two fluids molecularly mixed. The progress of this neutralization reaction was tracked by the addition of phenolphthalein - a pH-sensitive chemical indicator - to the acidic stream. Accurately calibrated backlit optical techniques were used to measure the average concentration of the colored chemical indicator. Comparisons of chemical product formation for pre-transitional buoyancy- and shear-driven mixing layers are given. It is also shown that experiments performed at different equivalence ratios (acid/alkali concentration) can be combined to obtain a mathematical relationship between the colored product formed and the density variance. This relationship was used to obtain high-fidelity, quantitative measures of the degree of molecular mixing which are independent of probe resolution constraints. The dependence of such mixing parameters on the Schmidt and Reynolds numbers is examined by comparing the current Sc (almost equal to) 103 measurements with Sc = 0.7 gas-phase and Pr = 7 liquid-phase measurements. This comparison indicates that the Schmidt number has a large effect on the bulk quantity of mixed fluid at small Reynolds numbers Re{sub h}
Book Synopsis Experiments on Turbulent Mixing and Chemical Reactions in a Liquid Mixing Layer by : Manoochehr Mohseni Koochesfahani
Download or read book Experiments on Turbulent Mixing and Chemical Reactions in a Liquid Mixing Layer written by Manoochehr Mohseni Koochesfahani and published by . This book was released on 1984 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analysis of Molecular Mixing in Vortical Structures Within a Shear Layer by : Fernando Miralles-Wilhelm
Download or read book An Analysis of Molecular Mixing in Vortical Structures Within a Shear Layer written by Fernando Miralles-Wilhelm and published by . This book was released on 1989 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Disorder and Mixing by : Etienne Guyon
Download or read book Disorder and Mixing written by Etienne Guyon and published by Springer. This book was released on 1988-12-31 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Cargèse, Corsica, France, June 15-27, 1987
Book Synopsis Study of Mixing and Reaction in the Field of a Vortex by : B. M. Cetegen
Download or read book Study of Mixing and Reaction in the Field of a Vortex written by B. M. Cetegen and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-Speed Flight Propulsion Systems by : S. N. B. Murthy
Download or read book High-Speed Flight Propulsion Systems written by S. N. B. Murthy and published by AIAA. This book was released on 1991 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Leading researchers provide a cohesive treatment of the complex issues in high-speed propulsion, as well as introductions to the current capabilities for addressing several fundamental aspects of high-speed vehicle propulsion development. Includes more than 380 references, 290 figures and tables, and 185 equations.
Book Synopsis Fluid Dynamics and Transport of Droplets and Sprays by : W. A. Sirignano
Download or read book Fluid Dynamics and Transport of Droplets and Sprays written by W. A. Sirignano and published by Cambridge University Press. This book was released on 2010-01-11 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
