The Influence of Differential Diffusion in Turbulent Oxygen Enhanced Methane Flames

2015 ◽  
pp. 511-517
Author(s):  
F. Dietzsch ◽  
C. Hasse ◽  
G. Fru ◽  
D. Thévenin
Keyword(s):  
Differential Diffusion ◽  
Methane Flames

Analysis of 205-nm photolytic production of atomic hydrogen in methane flames

2009 ◽  
Vol 97 (1) ◽  
pp. 227-242 ◽  
Author(s):  
W. D. Kulatilaka ◽  
J. H. Frank ◽  
B. D. Patterson ◽  
T. B. Settersten
Keyword(s):  
Atomic Hydrogen ◽  
Methane Flames

Near-limit downward propagation of hydrogen and methane flames in oxygennitrogen mixtures

1978 ◽  
Vol 33 ◽  
pp. 33-45 ◽  
Author(s):  
Bernard Bregeon ◽  
Alvin S. Gordon ◽  
Forman A. Williams
Keyword(s):  
Downward Propagation ◽  
Methane Flames

Measurements of differential diffusion in a liquid-filled lung model

1997 ◽  
Vol 23 (6) ◽  
pp. 498-503 ◽  
Author(s):  
J. R. Saylor
Keyword(s):  
Lung Model ◽  
Differential Diffusion

scholarly journals Differential Diffusivity Effects in Reactive Convective Dissolution

Fluids ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 83 ◽  
Author(s):  
V. Loodts ◽  
H. Saghou ◽  
B. Knaepen ◽  
L. Rongy ◽  
A. De Wit
Keyword(s):  
Diffusion Coefficients ◽  
Reaction Rate ◽  
Chemical Species ◽  
Mixing Zone ◽  
Simultaneous Presence ◽  
Dynamic Effects ◽  
Density Profiles ◽  
Differential Diffusion ◽  
Different Types ◽  
Double Diffusive

When a solute A dissolves into a host fluid containing a reactant B, an A + B → C reaction can influence the convection developing because of unstable density gradients in the gravity field. When A increases density and all three chemical species A, B and C diffuse at the same rate, the reactive case can lead to two different types of density profiles, i.e., a monotonically decreasing one from the interface to the bulk and a non-monotonic profile with a minimum. We study numerically here the nonlinear reactive convective dissolution dynamics in the more general case where the three solutes can diffuse at different rates. We show that differential diffusion can add new dynamic effects like the simultaneous presence of two different convection zones in the host phase when a non-monotonic profile with both a minimum and a maximum develops. Double diffusive instabilities can moreover affect the morphology of the convective fingers. Analysis of the mixing zone, the reaction rate, the total amount of stored A and the dissolution flux further shows that varying the diffusion coefficients of the various species has a quantitative effect on convection.

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