Flame front propagation and sinter strength properties of permeable sintering bed prepared via enhanced granulation with hydrated lime

2020 ◽  
Author(s):  
Mingxi Zhou ◽  
Hao Zhou
Keyword(s):  
Flame Front ◽  
Front Propagation ◽  
Hydrated Lime ◽  
Strength Properties ◽  
Sinter Strength

Metastability for a generalized Burgers equation with applications to propagating flame fronts

1999 ◽  
Vol 10 (1) ◽  
pp. 27-53 ◽  
Author(s):  
X. SUN ◽  
M. J. WARD
Keyword(s):  
Flame Front ◽  
Principal Eigenvalue ◽  
Vertical Channel ◽  
Front Propagation ◽  
Slow Motion ◽  
Diffusion Limit ◽  
Asymptotic Results ◽  
Small Diffusion ◽  
Generalized Burgers Equation ◽  
Exponentially Small

In the small diffusion limit ε→0, metastable dynamics is studied for the generalized Burgers problemformula hereHere u=u(x, t) and f(u) is smooth, convex, and satisfies f(0)=f′(0)=0. The choice f(u)=u2/2 has been shown previously to arise in connection with the physical problem of upward flame-front propagation in a vertical channel in a particular parameter regime. In this context, the shape y=y(x, t) of the flame-front interface satisfies u=−yx. For this problem, it is shown that the principal eigenvalue associated with the linearization around an equilibrium solution corresponding to a parabolic-shaped flame-front interface is exponentially small. This exponentially small eigenvalue then leads to a metastable behaviour for the time- dependent problem. This behaviour is studied quantitatively by deriving an asymptotic ordinary differential equation characterizing the slow motion of the tip location of a parabolic-shaped interface. Similar metastability results are obtained for more general f(u). These asymptotic results are shown to compare very favourably with full numerical computations.

scholarly journals Flame Front Propagation in an Optical GDI Engine under Stoichiometric and Lean Burn Conditions

Energies ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1337 ◽  
Author(s):  
Santiago Martinez ◽  
Adrian Irimescu ◽  
Simona Merola ◽  
Pedro Lacava ◽  
Pedro Curto-Riso
Keyword(s):  
Flame Front ◽  
Front Propagation ◽  
Lean Burn ◽  
Gdi Engine

Nonlinear effects of stretch on the flame front propagation

2010 ◽  
Vol 157 (10) ◽  
pp. 1825-1832 ◽  
Author(s):  
F. Halter ◽  
T. Tahtouh ◽  
C. Mounaïm-Rousselle
Keyword(s):  
Flame Front ◽  
Front Propagation ◽  
Nonlinear Effects

scholarly journals STRUCTURE OF A FLAME FRONT PROPAGATING AGAINST THE FLOW NEAR A COLD WALL

2002 ◽  
Vol 12 (11) ◽  
pp. 2547-2555 ◽  
Author(s):  
VADIM N. KURDYUMOV ◽  
AMABLE LIÑÁN
Keyword(s):  
Flame Front ◽  
Velocity Gradient ◽  
Front Propagation ◽  
Lewis Number ◽  
Critical Value ◽  
Constant Density ◽  
Density Approximation ◽  
Cold Wall ◽  
Low Velocity ◽  
Velocity Region

The flashback or propagation of premixed flames against the flow of a reacting mixture, along the low velocity region near a cold wall, is investigated numerically. The analysis, carried out using the constant density approximation for an Arrhenius overall reaction, accounts for the effects of the Lewis number of the limiting reactant. Flame front propagation and flashback are only possible for values of the near wall velocity gradient below a critical value. The flame propagation becomes chaotic for small values of the Lewis number.

scholarly journals The effect of pozzolan addition on the physical and mechanical properties of lime mortar

2018 ◽  
Vol 49 ◽  
pp. 00009
Author(s):  
Przemysław Brzyski
Keyword(s):  
Building Materials ◽  
Capillary Rise ◽  
Physical And Mechanical Properties ◽  
Hydrated Lime ◽  
Strength Properties ◽  
Diffusion Resistance ◽  
Natural Form ◽  
Water Absorption Coefficient ◽  
Lime Mortar ◽  
Alkaline Reaction

Hydrated lime, due to its life cycle (return to the natural form as a result of binding and hardening) shows a positive ecological aspect. The binder is often used in building materials based on plant components due to the high alkaline reaction and low diffusion resistance, as well as in mortars and plasters. However, it is an air binder with low strength parameters and the process of its binding and hardening is long-lasting. One of the ways to accelerate the binding processes and also to increase the strength of the binder is the use of additives in the form of pozzolanic materials which react with calcium hydroxide and form compounds with hydraulic properties. These are natural materials or industrial waste, so they do not affect the environmental impact of lime binder. The article presents the influence of the addition of pozzolan (three types) in various weight amounts, on the strength properties of mortars, their absorbability and capillary rise (presented as water absorption coefficient). The influence of pozzolan presence on workability of fresh mortars - their consistency was also checked.

Sign in / Sign up

Export Citation Format

Share Document