22 citations · 125 across the 34 of their papers we have counts for
29 papers · 1 filter
Premixed flames in a stagnation point flow under Darcy's law
Prabakaran Rajamanickam, Joel Daou
Premixed flames in stagnation point flows are traditionally described using Navier--Stokes equations where inertia and density variations play an important part in determining the…
Hydrodynamic theory of premixed flames under Darcy's law: Interfacial conditions and effects of nonunity Lewis number and heat loss
Prabakaran Rajamanickam, Joel Daou
Premixed flames propagating in porous media or Hele-Shaw channels are governed by Darcy's law, which accounts for the strong frictional forces imposed by the solid matrix or confin…
A simplified model for coupling Darrieus-Landau and diffusive-thermal instabilities
Prabakaran Rajamanickam
A simplified phenomenological model is proposed to couple the long-wave Darrieus--Landau (DL) instability and the short-wave diffusive-thermal (DT) instability in premixed flames.…
Hydrodynamic origin of Korteweg stresses from shear-induced horizontal buoyancy
Prabakaran Rajamanickam
A recent study \cite{rajamanickam2025shear} of non-Boussinesq fluids in narrow channels identified a novel shear-induced horizontal buoyancy force that emerges upon depth-averaging…
Flame dynamics and Markstein numbers in Hele-Shaw cells and porous media under Darcy's law
Prabakaran Rajamanickam, Joel Daou
The propagation of premixed flames in narrow Hele-Shaw cells and permeable porous media is governed by Darcy's law, leading to hydrodynamic behaviour distinct from conventional fla…
Taylor dispersion and large-deviation structure in stagnation-point flows without homogenisation
Prabakaran Rajamanickam
We study the long-time dispersion of a passive scalar in linearly accelerating flows whose strain rate varies transversely: the axially strained flow in a porous tube with w…
Axially strained flow in a porous duct of circular-sector cross-section
Prabakaran Rajamanickam
A canonical problem of axially strained flow in a duct of circular-sector cross-section, with fluid injection through the circular arc, is examined for a range of Reynolds numbers…
Kerr-Dold vortices in an axisymmetric stagnation point flow
Prabakaran Rajamanickam
The existence of Kerr-Dold-type vortices in axisymmetric stagnation point flow is demonstrated, extending the class of known thick vortex solutions.
Taylor dispersion in variable-density, variable-viscosity pulsatile flows
Prabakaran Rajamanickam, Adam D. Weiss
The phenomenon of Taylor or shear-induced dispersion of a non-passive scalar field in a pulsatile pipe flow is investigated, accounting for the scalar field's influence on fluid de…
Premixed flame quenching distance between cold walls: effects of flow and Lewis number
Aiden Kelly, Rémi Daou, Joel Daou +2
This study investigates the critical conditions for flame propagation in channels with cold walls. We analyze the impact of the Lewis number and flow amplitude () on the minimum…
Hydrodynamic theory of premixed flames under Darcy's law
Prabakaran Rajamanickam, Joel Daou
This paper investigates the theoretical implications of applying Darcy's law to premixed flames, a topic of growing interest in research on flame propagation in porous media and co…
Hydrodynamic instabilities of propagating interfaces under Darcy's law
Joel Daou, Prabakaran Rajamanickam
The hydrodynamic instabilities of propagating interfaces in Hele-Shaw channels or porous media under the influence of an imposed flow and gravitational acceleration are investigate…
Shear-induced force and dispersion due to buoyancy in a horizontal Hele-Shaw cell
Prabakaran Rajamanickam
This paper investigates shear flow in a Hele-Shaw cell, driven by varying horizontal buoyancy forces resulting from a horizontal density gradient induced by a scalar field. By empl…
Effect of a shear flow on the Darrieus-Landau instability in a Hele-Shaw channel
Prabakaran Rajamanickam, Joel Daou
The Darrieus--Landau instability of premixed flames propagating in a narrow Hele-Shaw channel in the presence of a strong shear flow is investigated, incorporating also the Rayleig…
Three-dimensional diffusive-thermal instability of flames propagating in a plane Poiseuille flow
Aiden Kelly, Prabakaran Rajamanickam, Joel Daou +1
The three-dimensional diffusive-thermal stability of a two-dimensional flame propagating in a Poiseuille flow is examined. The study explores the effect of three non-dimensional pa…
Stability of diffusion flames under shear flow: Taylor dispersion and the formation of flame streets
Prabakaran Rajamanickam, Aiden Kelly, Joel Daou
Diffusion flame streets, observed in non-premixed micro-combustion devices, align parallel to a shear flow. They are observed to occur in mixtures with high Lewis number () fue…
Effective Lewis number and burning speed for flames propagating in small-scale spatio-temporal periodic flows
Prabakaran Rajamanickam, Joel Daou
Propagation of premixed flames having thick reaction zones in rapidly-varying, small-scale, zero-mean, spatio-temporal periodic flows is considered. Techniques of large activation…
On the two-reactant one-step activation-energy asymptotics for steady, adiabatic, planar flames with Lewis numbers of unity
Prabakaran Rajamanickam
Aspects of predictions of activation-energy asymptotics concerning the dependence of the burning velocity on the equivalence ratio are examined here through both asymptotic analyse…
Diffusive-thermal instabilities of a planar premixed flame aligned with a shear flow
Joel Daou, Prabakaran Rajamanickam
The stability of a thick planar premixed flame, propagating steadily in a direction transverse to that of unidirectional shear flow, is studied. A linear stability analysis is carr…
Influences of stoichiometry on steadily propagating triple flames in counterflows
Prabakaran Rajamanickam, Wilfried Coenen, Antonio L. Sánchez +1
Most studies of triple flames in counterflowing streams of fuel and oxidizer have been focused on the symmetric problem in which the stoichiometric mixture fraction is . There…
Near-limit H-O-N combustion in nonpremixed counterflow mixing layers
Jaime Carpio, Prabakaran Rajamanickam, Antonio L. Sánchez +1
Numerical computations employing detailed chemistry are used to characterize the different combustion modes emerging in mixing layers separating nitrogen-diluted counterflowing pla…
Thermal explosion characteristics of a gelled hypergolic droplet
Prabakaran Rajamanickam
When a sphere of one reactant is placed in the medium of another reactant with which it is hypergolic, a chemical reaction (modeled here as a zeroth-order one-step irreversible Arr…
A thick reaction zone model for premixed flames in two-dimensional channels
Prabakaran Rajamanickam, Joel Daou
Direct interactions between the flow field and the chemical reaction in premixed flames occur when the reaction zone thickness is comparable to, or greater than flow length scales.…
A note on viscous flow induced by half-line sources bounded by conical surfaces
Prabakaran Rajamanickam, Adam D. Weiss
In this paper axisymmetric solutions of the Navier-Stokes equations governing the flow induced by a half-line source when the fluid domain is bounded by a conical wall are discusse…