Author: John R. SheaPublisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 125
Book Description
A Chemical Reaction in a Turbulent Jet
Author: John R. SheaPublisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 125
Book Description
A Chemical Reaction in a Turbulent Jet
Author: John R Shea (III.)Publisher:
ISBN:
Category :
Languages : en
Pages : 139
Book Description
The turbulent mixing and subsequent chemical reaction of gases is an essential part of many technological processes ranging from gas furnaces to chemical lasers. Generally the chemical kinetics are well understood, but the process of turbulent mixing is not. Knowledge of where turbulent fluid is mixed on a molecular scale is critical for predicting chemical reaction rates in the flow. In this experiment the rate of a chemical reaction in an axisymmetric turbulent jet is studied, and the results are used to determine the rate of molecular mixing in the jet. A turbulent jet containing dilute ozone in an inert mixture of nitrogen and oxygen flows into a stagnant tank of nitric oxide and nitrogen. When the gases mix on a molecular scale, the ozone and nitric oxide rapidly react to produce oxygen and nitrogen dioxide. The rate at which the mixing and chemical reaction proceeds is determined by using an ultraviolet light absorption techniques to measure the time averaged ozone concentration at points throughout the jets mixing zone. The experiment establishes a criterion for determining when a reaction of known chemical kinetics is sufficiently rapid that chemical non-equilibrium has a negligible effect on the mean reactant profile.
Effects of Turbulent Mixing on Chemical Reaction in an Aerosol-producing Co-flow Jet
Author: Thomas Paris JenkinsPublisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 580
Book Description
Investigates the effects of mixing on chemical reaction in a turbulent co-flow jet. After a jet is produced by a mixture of HCl (hydrogen chloride), air, and N2 (nitrogen) issuing from a pipe into a co-flowing stream of NH3 (gaseous ammonia) and air, a chemical reaction in which NH4Cl (ammonium chloride) aerosol with negligible heat release is produced. The product concentration field as marked by the aerosol is then characterized through the collection of data from which probability density functions can be constructed.
Chemical Reactions in Turbulent Mixing Flows
Author: Paul E. DimotakisPublisher:
ISBN:
Category : Gas dynamics
Languages : en
Pages : 72
Book Description
This program focused on fundamental investigations of mixing, chemical-reaction, and combustion processes, in turbulent, subsonic, and supersonic free-shear flows. The program was comprised of an experimental effort; an analytical, modeling, and computational effort; and a diagnostics, instrumentation, and data-acquisition-development effort, with significant progress in each. With regard to gas-phase shear-layer mixing and combustion, effects of inflow/initial conditions, compressibility, and Reynolds number were experimentally investigated and, to a large extent, clarified. New measures to characterize level sets in turbulence were developed and successfully employed to characterize experimental data of liquid-phase turbulent-jet flows as well as three-dimensional direct-numerical-simulation data of Rayleigh-Taylor-instability flows. The computational effort has added to our understanding of the (H2+NO)/F2 chemical system employed in the shear-layer-mixing investigations as well as mixing in high-speed flows, along with further developments in Riemann-Invariant-Manifold gasdynamic simulation techniques and their application to unsteady detonation phenomena. On the diagnostic front, developments in digital imaging and Image Correlation Velocimetry have continued, and been used to investigate turbulent-jet mixing, the unsteady flow over an accelerating airfoil, to mitigate aliasing problems in the computer reconstruction of (2+1)-dimensional isosurface data, and in other applications.
Experiments on Entrainment, Mixing and Chemical Reactions in Turbulent Jets at Large Schmidt Number
Author: Werner Johann Anton DahmPublisher:
ISBN:
Category : Jets
Languages : en
Pages : 322
Book Description
Mixing and Chemical Reactions in Turbulent Flow Reactors
Author: Roger Norris KeelerPublisher:
ISBN:
Category : Chemical reactions
Languages : en
Pages : 208
Book Description
The Theory of Turbulent Jets
Author: Genrikh Naumovich AbramovichPublisher:
ISBN:
Category : Jets
Languages : en
Pages : 660
Book Description
Turbulent Mixing and Chemical Reactions
Author: Jerzy BałdygaPublisher: John Wiley & Sons
ISBN: 0471981710
Category : Science
Languages : en
Pages : 900
Book Description
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.
An Experimental Investigation of Ducted, Reactive, Turbulent Jet Mixing with Recirculation
Author: D. E. ChrissPublisher:
ISBN:
Category : Gas flow
Languages : en
Pages : 52
Book Description
An experimental investigation of ducted, two stream, subsonic, reactive, turbulent jet mixing with recirculation was conducted. A primary jet of air at a mass flow rate of 0.075 lb/sec and velocity of 700 ft/sec was surrounded by an outer, low velocity, hydrogen stream. Data were obtained with hydrogen-air ratios of 0.143 and 0.107. The duct-to-inner nozzle diameter ratio was ten. Radial distributions of hydrogen mass fraction, mean axial velocity, turbulence intensity, and total pressure as well as axial distributions of wall hydrogen mass fraction and wall static pressure are presented for axial stations from one-half to five duct diameters from the nozzle exit plane. Comparison of the experimental data with calculations assuming frozen or equilibrium chemistry indicate that he measured velocity, pressure, and composition data are, in general, self-consistent. The maximum turbulent intensities which occurred in the center of the mixing layer and within the recirculation eddy were very high having values of 20 percent of the jet exit velocity. The velocity and composition field indicate that, while and mixing in the reactive flow field is slower than for the nonreactive case, the reaction had little effect on the size and location of the recirculation zone within the mixing duct.
Author: Geraint Jones Davies