3 edition of Mixing and non-equilibrium chemical reaction in a compressible mixing layer found in the catalog.
Mixing and non-equilibrium chemical reaction in a compressible mixing layer
1991 by State University of New York, National Aeronautics and Space Administration, Lewis Research Center in Buffalo, N.Y, [Cleveland, Ohio .
Written in English
|Other titles||Mixing and non equilibrium chemical reaction in a compressible mixing layer.|
|Statement||Craig J. Steinberger.|
|Series||NASA contractor report -- 187084., NASA contractor report -- NASA CR-187084.|
|Contributions||Lewis Research Center.|
|The Physical Object|
The General Assembly of the International Union of Theoretical and Applied Mechanics in its meeting on Aug , selected for only four Mechanics Symposia, of which ours is the only one related to Fluid Mechanics: Variable Density Low Speed Turbulent Flows. This IUTAM Symposium. MIT Principles of Chemical Science, Fall View the complete course: Instructor: Catherine Drennan Reactions reach chemical equilibrium when the rate of the. Such effects include localized heating due to energy release that accelerate chemical reactions, enhanced mixing as a result of local temperature gradients, ionic wind effects (i.e., momentum transfer initiated by an electric field), and non-equilibrium radical production. View Notes - 7. Mixing (Summary in MS Word) from CPL S at Cape Peninsula University of Technology. MIXING Applied to the processes used to reduce the degree of .
In physics and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on .
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The effects of compressibility, chemical reaction exothermicity and non-equilibrium chemical modeling in a reacting plane mixing layer were investigated by means of two dimensional direct numerical simulations.
The chemical reaction was irreversible and second order of the type A + B *Products + Heat. The general governing fluid. Get this from a library. Mixing and non-equilibrium chemical reaction in a compressible mixing layer. [Craig J Steinberger; Lewis Research Center.].
and the non-equilibrium effects of chemical kinetics on the compostional structure of the flame in high speed reacting mixing layers. This work has been mainly motivated due to the iterest of NASA in understanding the global and detail mechanisms of mixing and chemical reactions in high speed flows.
Appendix II provides a detail description of our. Results are presented of direct numerical simulations of a two-dimensional temporally developing high speed mixing layer under the influence of a second-order non-equilibrium chemical reaction of the type A + B→ Products + tions arc performed with different magnitudes of the convective Mach number and with different chemical kinetics Cited by: Previous investigations have demonstrated that a compressible reacting mixing layer can develop two instability modes in addition to the more common central mode that exists unaccompanied in incompressible nonreacting flows.
These two additional modes are termed “outer” because of their association with the fast and slow free by: Mixing and Chemical Reactions in a Spatially Developing Mixing Layer Journal of Non-Equilibrium Thermodynamics, Vol.
13, No. 4 Simulations of ramjet combustor flow by: Understanding the structure and the stability characteristics of a reacting compressible mixing layer is of fundamental importance.
Also, this flow can regarded as the simplest relevant model of the combustion process in the scramjet. The theory describing the structure and stability of this flow is by: 4. Fluid Mech. (), vol.pp.
Printed in Cheat Britain A simple model of mixing and chemical reaction in a turbulent shear layer By J. BROADWELL AND R. BREIDENTHALT Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91 (Received 2 July and in revised form 24 May )File Size: 1MB.
compressible mixing layer. In contrast to dilatational effects, the structural compressibility effects strongly affect the pressure field, so the pressure fluctuations were reduced.
The consequent effects on the pressure-strain correlation may cause significant changes on turbulence structures. As a consequence, the. The processes of entrainmentt and mixing are investigated in reacting and non-reacting, uniform density, liquid mixing layers over a wide range of Reynolds numbers.
In non-reacting cases, a passive scalar technique is used to measure the probability density function (pdf) of the composition field. Chemically reacting experiments employ a diffusion-limited acid-base Cited by: Mixing of a passive scalar in a turbulent compressible mixing layer of convective Mach number has been studied using a direct numerical simulation method.
The turbulent flow is generated by going Cited by: 1. 6(c) is the corresponding experiment• The flow corresponds to the eccentric helical annular mixing flow (EHAM), a combination of Poiseuille flow and modulation of the cylinders• In (a) the number of particles injected to mimic the streakline is constant in time; in (b) it Cited by: The subgrid-scale terms for different formulations of the energy equation are evaluated from a-priori tests using the direct numerical simulation (DNS) data of a compressible mixing layer.
Compressible turbulence mixing layers play an important role in many industrial applications such as aerospace, combustion and engineering problems related to the environnemental domains. The direct extension of incompressible models was used in simulating different compressible flows.
That one was. erger(). spaceEngineering,June Thesis: “Mixing and Non-Equilibrium Chemical Reaction in a Compressible Mixing Layer,” co-advised with P. Givi. Undergraduate Research Aides: Christopher M. Nuckols (), supported by NASA/CORNELL Fellowship Award.
Mixing and turbulent mixing are non-equilibrium processes that occur in a broad variety of processes in fluids, plasmas and materials. The processes can be natural or artificial, their characteristic scales can be astrophysical or atomistic, and energy densities can be low or high. Understanding the fundamental aspects of turbulent mixing is necessary to comprehend the Author: Gauthier, Serge.
A LES study of a mixed supersonic–subsonic compressible scalar mixing layer is carried out using a conventional gradient diffusion and a sub-grid LEM closure.
Flow visualization and analysis of the momentum transport reveals that the growth rate is suppressed in comparison to the incompressible counterpart, and this result is in good agreement with experimental data for the simulated M by: The mixing layer is viewed as a prototype for a class of inviscidly unstable free shear flows including jets and wakes, and the focus is on 2D homogeneous incompressible mixing layers.
Reactions in a mixing layer I We consider a simple passive reaction of the second order, A+ B!C I The mass action law is assumed, w = kY AY B I Different values of Damkohler number are considered¨ Da = kY RL2=D One can introduce the effective reaction constant as follows dY C dt = k effY AY B; where “bar” denotes averaging over the whole domain.
Entropy production and exergy destruction in multi-phase flows with simultaneous heat and or mass transport, with and without chemical reactions, are also welcome. The applications of non-equilibrium thermodynamics in the design and optimization of multi-phase flow processes would be considered as well.
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.5/5(2).
Modelling Chemical Reaction in a Scalar Mixing Layer B.L. Sawford Department of Mechanical Engineering Monash University, Clayton, VIC, AUSTRALIA Abstract Statistics of passive and reactive scalar concentration in a scalar mixing layer are modelled using a Lagrangian particle model coupled to a micro-mixing model and using conserved scalar.
The comparable time scales lead to a closely coupled turbulent mixing and chemical reaction rates. Combustion cannot be initiated until mixing has been achieved at a molecular level, and, in turn, in regions where combustion has taken place, the temperature rise and the chemical composition changes modify the parameters responsible for by: 4.
Mixing and non-equilibrium chemical reaction in a compressible mixing layers. Mixing of a conserved scalar in a turbulent reacting shear layer. Mixing transition and the cascade to small scales in a plane mixing layer. modeling and analysis of turbulent supercritical mixing.
().Author: Mohammad Pezeshki. Plane turbulent mixing between two streams of different gases (especially nitrogen and helium) was studied in a novel apparatus. Spark shadow pictures showed that, for all ratios of densities in the two streams, the mixing layer is dominated by large coherent by: The hypervelocity two-dimensional reacting supersonic mixing layer experiments of Erdos et al.
with a H 2 /air stream have been simulated with model free fine grid calculations on a N–S solver with full and single step chemistry. Response of the flow to fluctuations in the in-flow stream is utilized to examine chemistry fluid flow interactions.
A favourable comparison of the Cited by: Development of a two-stream mixing layer from tripped and untripped boundary layers. Direct numerical simulation of spatially developing highly compressible mixing layer: Structural evolution and turbulent statistics.
Physics of Fluids, Vol. 31, No. 3 Development of a two-stream mixing layer from tripped and untripped boundary by: Thesis: Mixing and Non-Equilibrium Chemical Reaction in a Compressible Mixing Layer. Published as NASA Contractor Report (). Thomas J. Vidoni () Thesis: Mixing Characteristics of a Compressible, Two-Dimensional Spatially Developing Planar Jet.
If H is the height of the domain, the time T over which vertical mixing occurs is given by: D H T 2 Now, the horizontal spread is related to how far apart two fluid parcels are sheared awayNow, the horizontal spread is related to how far apart two fluid parcels are sheared away during this time Size: KB.
agitated vessel average baffled vessel batch mixing calculated Calderbank Chem circulation coefficient concentration constant Continuous Mixing correlation correlation function Corrsin curve defined by Eq density diam dimensional analysis dimensionless groups discharge rate disk effect energy equation Eulerian experimental flat-blade turbine.
Experimental investigations of unsteady separated flows, high-enthalpy flows, 3D configurations, laminar and transitional flows are addressed. Theoretical predictions of aerodynamic performances are provided along with analyses of supersonic combustion, detonation, simulation of reactive mixing layer and non-equilibrium flow.
Instantaneous distributions of temperature and mass fraction of H 2 and H 2 O at t = 2 ms are shown in Figure 7. At about x = m, the mixing layer loses stability, the large-scale vortices begin to form, and efficient mixing occurs inside the vortices.
Due to the relatively high temperature of air, Cited by: 1. However, for the compressible case, how to measure the mixing layer remains a thorny problem.
Here we present two independent interface-tracking methods. One is by tracking the mean temperature of the upper and bottom fluids while the other is by tracking the maximum values of TNE characteristic quantities, such as Δy ∗.Cited by: 4. T1 - On harmonic perturbations in compressible mixing layers.
AU - Yang, Hong. AU - Tumin, Anatoli. PY - Y1 - N2 - A theoretical model of harmonic perturbations in a compressible turbulent mixing layer is proposed. The Cited by: 6. Simulations are performed for flows under various initializations to include the effects of compressibility on mixing and chemical reactions.
In the work related with DNS, a two-dimensional temporally developing high speed mixing layer under the influence of a second-order non-equilibrium chemical reaction of the type A B yields products heat. of compressible mixing layers High Speed Flow Experiments – am Rodney Bowersox “High‐Speed Turbulence with Non‐Equilibrium Effects ” compressible Navier-Stokes equations are solved numerically for a temporally evolving mixing layer, using a.
Thermodynamics Lecture Notes. This note covers the following topics: systems surroundings and thermodynamic variables work and equilibrium introduced, temperature and the zeroth law of thermodynamics, basic properties of basic systems, reversible processes, internal energy: heat capacities and the first law of thermodynamics, isothermal and adiabatic expansions, ideal gas.
The goals of the International Conference `Turbulent Mixing and Beyond' are to expose the generic problem of Turbulence and Turbulent Mixing in Unsteady Flows to a wide scientific community, to promote the development of new ideas in tackling the fundamental aspects of the problem, to assist in the application of novel approaches in a broad range of phenomena, Cited by: 5.
• Chemical Blending – Mixing liquid and liquid – creating a new formulation without chemical reaction • Chemical Reactions – Creating new molecular entities through chemical reactions of gaseous, liquid or solid raw materials; specialization in silane and silicone chemistry, hydrosilylation, and free radical polymerization.
Advanced mixing nozzle concepts for COIL Advanced mixing nozzle concepts for COIL Yang, Tientsai T. ABSTRACT An advanced mixing nozzle concept has been developed for high chemical efficiency, high pressure recovery chemical oxygen-iodine laser applications.
This concept incorporates the use of mixing tabs mounted at the nozzle. An investigation of compressible, turbulent mixing layers has been completed. The experiments were conducted using pressure measurements, schlieren photography and velocity measurements with a two-component laser Doppler velocimeter system.
These diagnostic systems were developed for use with the mixing layer wind-tunnel by: The computation of complex turbulent flows by statistical modelling has already a long history. The most popular two-equation models today were introduced in the early sev enties. However these models have been generally tested in rather academic cases.
The develope ment of computers has led to. If the reaction had simply stopped when equilibrium is reached, then there would have been no mixing of isotopes in this way. Equilibrium can be attained from both sides, whether we start reaction.