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Thermally Induced Secondary Atomization Of Droplet In An Acoustic Field, Saptarshi Basu, Abhishek Saha, Ranganathan Kumar
Thermally Induced Secondary Atomization Of Droplet In An Acoustic Field, Saptarshi Basu, Abhishek Saha, Ranganathan Kumar
Faculty Bibliography 2010s
We study the thermal effects that lead to instability and break up in acoustically levitated vaporizing fuel droplets. For selective liquids, atomization occurs at the droplet equator under external heating. Short wavelength [Kelvin-Helmholtz (KH)] instability for diesel and bio-diesel droplets triggers this secondary atomization. Vapor pressure, latent heat, and specific heat govern the vaporization rate and temperature history, which affect the surface tension gradient and gas phase density, ultimately dictating the onset of KH instability. We develop a criterion based on Weber number to define a condition for the inception of secondary atomization.
Rkky Interaction In Disordered Graphene, Hyunyong Lee, Junghoon Kim, E. R. Mucciolo, Georges Bouzerar, S. Kettemann
Rkky Interaction In Disordered Graphene, Hyunyong Lee, Junghoon Kim, E. R. Mucciolo, Georges Bouzerar, S. Kettemann
Faculty Bibliography 2010s
We investigate the effects of nonmagnetic disorder on the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction in graphene by studying numerically the Anderson model with on-site and hopping disorder on a honeycomb lattice at half filling. We evaluate the strength of the interaction as a function of the distance R between two magnetic ions, as well as their lattice positions and orientations. In the clean limit, we find that the strength of the interaction decays as 1/R-3, with its sign and oscillation amplitude showing strong anisotropy. With increasing on-site disorder, the mean amplitude decreases exponentially at distances exceeding the elastic mean free path. At …
Effects Of Disorder Range And Electronic Energy On The Perfect Transmission In Graphene Nanoribbons, Leandro R. F. Lima, Felipe A. Pinheiro, Rodrigo B. Capaz, Caio H. Lewenkopf, Eduardo R. Mucciolo
Effects Of Disorder Range And Electronic Energy On The Perfect Transmission In Graphene Nanoribbons, Leandro R. F. Lima, Felipe A. Pinheiro, Rodrigo B. Capaz, Caio H. Lewenkopf, Eduardo R. Mucciolo
Faculty Bibliography 2010s
Numerical calculations based on the recursive Green's function method in the tight-binding approximation are performed to calculate the dimensionless conductance g in disordered graphene nanoribbons with Gaussian scatterers. The influence of the transition from short-to long-ranged disorder on g is studied as well as its effects on the formation of a perfectly conducting channel. We also investigate the dependence of electronic energy on the perfectly conducting channel. We propose and calculate a backscattering estimate in order to establish the connection between the perfectly conducting channel (with g = 1) and the amount of intervalley scattering.
Plasma Relaxation And Topological Aspects In Hall Magnetohydrodynamics, Bhimsen K. Shivamoggi
Plasma Relaxation And Topological Aspects In Hall Magnetohydrodynamics, Bhimsen K. Shivamoggi
Faculty Bibliography 2010s
Parker's formulation of isotopological plasma relaxation process in magnetohydrodynamics (MHD) is extended to Hall MHD. The torsion coefficient a in the Hall MHD Beltrami condition turns out now to be proportional to the potential vorticity. The Hall MHD Beltrami condition becomes equivalent to the potential vorticity conservation equation in two-dimensional (2D) hydrodynamics if the Hall MHD Lagrange multiplier beta is taken to be proportional to the potential vorticity as well. The winding pattern of the magnetic field lines in Hall MHD then appears to evolve in the same way as potential vorticity lines in 2D hydrodynamics.
Cascaded Plasmon Resonant Field Enhancement In Nanoparticle Dimers In The Point Dipole Limit, Seyfollah Toroghi, Pieter G. Kik
Cascaded Plasmon Resonant Field Enhancement In Nanoparticle Dimers In The Point Dipole Limit, Seyfollah Toroghi, Pieter G. Kik
Faculty Bibliography 2010s
Cascaded field enhancement in silver dimer nanostructures is investigated using a dipole-dipole interaction model. Field enhancement spectra are evaluated as a function of the particle size difference and inter-particle spacing. We observe three distinct regimes of cascaded field enhancement: hindered cascading, multiplicative cascading, and the ultimate cascading limit, depending on the dimer interaction strength. Multiplicative cascading at small inter-particle spacing leads to analytic expressions for the ultimate internal and external field enhancement factors. For silver dimers in a host with index 1.5, we obtain a maximum internal field enhancement of 2.9 X 10(3), a factor of 75 larger than that …