Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Physics
Entropic Characterization Of Mixing In Microchannels, Marco Camesasca, Ica Manas Zloczower, Miron Kaufman
Entropic Characterization Of Mixing In Microchannels, Marco Camesasca, Ica Manas Zloczower, Miron Kaufman
Physics Faculty Publications
A methodology for rigorous mixing assessment in microchannels is presented. The analysis is based on numerical simulations of flow in different geometries coupled with mixing assessment using entropic measures. The results show enhanced mixing efficiency for the staggered herringbone micromixer by comparison with a mixer with straight diagonal ridges and a lack of mixing in a non-patterned channel. These results are in agreement with published experimental data.
Debye Series Analysis Of Scattering Of A Plane Wave By A Spherical Bragg Grating, James A. Lock
Debye Series Analysis Of Scattering Of A Plane Wave By A Spherical Bragg Grating, James A. Lock
Physics Faculty Publications
The Debye series decomposition of the partial-wave scattering amplitudes of a multilayer sphere is derived. The partial-wave transmission and reflection terms appearing in the Debye series are multiple-scattering amplitudes written in terms of four basic quantities and combined together layer by layer in an identical way. The resulting expressions are then used to calculate the scattered intensity of a spherical Bragg grating covering a dielectric core particle and to analyze a number of new structures appearing in the scattered intensity. (c) 2005 Optical Society of America.
The Appearance, Apparent Speed, And Removal Of Optical Effects For Relativistically Moving Objects, Robert J. Deissler
The Appearance, Apparent Speed, And Removal Of Optical Effects For Relativistically Moving Objects, Robert J. Deissler
Physics Faculty Publications
Because various parts of an object are different distances from an observer, and light takes a finite time to reach the observer, the appearance of a relativistically moving object will be very different from that given by the Lorentz contraction. We derive equations that can be applied to a photographic image so that the Lorentz contraction can still be observed. We also give equations that quantify the apparent deformation of the object and plots that show the apparent speed of the object as a function of time. In particular, as an object approaches, its apparent speed can be much greater …
Color Mixing In The Metering Zone Of A Single Screw Extruder: Numerical Simulations And Experimental Validation, Kirill Alemaskin, Ica Manas Zloczower, Miron Kaufman
Color Mixing In The Metering Zone Of A Single Screw Extruder: Numerical Simulations And Experimental Validation, Kirill Alemaskin, Ica Manas Zloczower, Miron Kaufman
Physics Faculty Publications
We present numerical simulations for an acrylonitrile-butadiene-styrene copolymer (ABS) resin extrusion in an industrial conventional single-screw extruder. Based upon the flow field patterns obtained in the simulations, a particle tracking procedure was employed to obtain information about the spatial distribution of particle tracers of two colors. Results of the simulation were compared with experimental data obtained under similar extrusion conditions. To evaluate the degree of color mixing and color homogeneity for the system, we employ a specific index calculated based upon the Shannon entropy for two species populations.
320-Channel Dual Phase Lock-In Optical Spectrometer, Petru S. Fodor, S. Rothenberger, J. Levy
320-Channel Dual Phase Lock-In Optical Spectrometer, Petru S. Fodor, S. Rothenberger, J. Levy
Physics Faculty Publications
The development of a multiple-channel lock-in optical spectrometer (LIOS) is presented, which enables parallel phase-sensitive detection at the output of an optical spectrometer. The light intensity from a spectrally broad source is modulated at the reference frequency, and focused into a high-resolution imaging spectrometer. The height at which the light enters the spectrometer is controlled by an acousto-optic deflector, and the height information is preserved at the output focal plane. A two-dimensional InGaAs focal plane array collects light that has been dispersed in wavelength along the horizontal direction, and in time along the vertical direction. The data is demodulated using …
Entropic Analysis Of Color Homogeneity, Kirill Alemaskin, Ica Manas Zloczower, Miron Kaufman
Entropic Analysis Of Color Homogeneity, Kirill Alemaskin, Ica Manas Zloczower, Miron Kaufman
Physics Faculty Publications
We propose an entropic measure to assess color homogeneity as well as deviations from a standard/ideal color. We illustrate the concept by analyzing samples obtained in a single screw extruder by mixing blue and yellow polymer pellets. Alternatively the proposed technique can be employed to assess the efficiency and degree of distributive mixing attained in polymer processing equipment.