Lagrangian modeling of scalar statistics in a double scalar mixing layer

2006 ◽  
Vol 18 (8) ◽  
pp. 085108 ◽  
Author(s):  
Brian L. Sawford
Keyword(s):  
Mixing Layer ◽  
Scalar Mixing ◽  
Lagrangian Modeling

Reaction in a scalar mixing layer

1991 ◽  
Vol 233 ◽  
pp. 211-242 ◽  
Author(s):  
R. W. Bilger ◽  
L. R. Saetran ◽  
L. V. Krishnamoorthy
Keyword(s):  
Chemical Reaction ◽  
Mixing Layer ◽  
Reacting Flow ◽  
Scalar Mixing ◽  
Scalar Theory ◽  
Thermal Mixing ◽  
Fast Chemistry ◽  
The Mean ◽  
Reactive Scalars ◽  
Made In

Reaction in a scalar mixing layer in grid-generated turbulence is studied experimentally by doping half of the flow with nitric oxide and the other half with ozone. The flow conditions and concentrations are such that the chemical reaction is passive and the flow and chemical timescales are of the same order. Conserved scalar theory for such flows is outlined and further developed; it is used as a basis for presentation of the experimental results. Continuous measurements of concentration are limited in their spatial and temporal resolution but capture sufficient of their spectra for adequate second-order correlations to be made. Two components of velocity have been measured simultaneously with hot-wire anemometry. Conserved scalar mixing results, deduced from reacting and non-reacting measurements of concentration, show the independence of concentration level and concentration ratio expected for passive reacting flow. The results are subject to several limitations due to the necessary experimental compromises, but they agree generally with measurements made in thermal mixing layers. Reactive scalar statistics are consistent with the realizability constraints obtainable from conserved scalar theory where such constraints apply, and otherwise are generally found to lie between the conserved scalar theory limits for frozen and very fast chemistry. It is suggested that Toor's (1969) closure for the mean chemical reaction rate could be improved by interpolating between the frozen and equilibrium values for the covariance. The turbulent fluxes of the reactive scalars are found to approximately obey the gradient model but the value of the diffusivity is found to depend on the Damköhler number.

Lagrangian micromixing modelling of reactive scalar statistics: scalar mixing layer in decaying grid turbulence

2015 ◽  
Vol 58 (4) ◽  
pp. 251 ◽  
Author(s):  
Andrea Amicarelli ◽  
Giovanni Leuzzi ◽  
Paolo Monti ◽  
Nicola Pepe ◽  
Guido Pirovano
Keyword(s):  
Mixing Layer ◽  
Grid Turbulence ◽  
Scalar Mixing ◽  
Reactive Scalar

Scalar Mixing Layer in Grid Turbulence with Transport of Passive and Reactive Species

1989 ◽  
pp. 109-118 ◽  
Author(s):  
L. R. Saetran ◽  
D. R. Honnery ◽  
S. H. Stårner ◽  
R. W. Bilger
Keyword(s):  
Mixing Layer ◽  
Reactive Species ◽  
Grid Turbulence ◽  
Scalar Mixing

0140 Basic Characteristics of the High-Schmidt Number Scalar Mixing Layer by Multiscale Grid Turbulence

2010 ◽  
Vol 2010 (0) ◽  
pp. 85-86
Author(s):  
Ryota UKAI ◽  
Hiroki SUZUKI ◽  
Kouji NAGATA ◽  
Yasuhiko SAKAI ◽  
Osamu TERASHIMA
Keyword(s):  
Schmidt Number ◽  
Mixing Layer ◽  
Grid Turbulence ◽  
Scalar Mixing ◽  
High Schmidt Number ◽  
Basic Characteristics

C134 Fractal Characteristics o f Scalar Mixing in Chemically Reacting Turbulent Mixing Layer

2011 ◽  
Vol 2011 (0) ◽  
pp. 71-72
Author(s):  
Kazuki Matsukawa ◽  
Naoya Fukushima ◽  
Masayasu Shimura ◽  
Mamoru Tanahashi ◽  
Toshio Miyauchi
Keyword(s):  
Turbulent Mixing ◽  
Mixing Layer ◽  
Scalar Mixing ◽  
Turbulent Mixing Layer ◽  
Fractal Characteristics ◽  
Chemically Reacting
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