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Faculty Publications

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Articles 3271 - 3291 of 3291

Full-Text Articles in Engineering

Model For Coal-Fired Reactors, Philip J. Smith, Thomas H. Fletcher, L. Douglas Smoot Jan 1981

Model For Coal-Fired Reactors, Philip J. Smith, Thomas H. Fletcher, L. Douglas Smoot

Faculty Publications

An axisymmetric, elliptic model has been developed for analysis of confined, turbulent coal-laden diffusion flames. The scheme is Eulerian for gases and Lagrangian for particles. The approach emphasizes the turbulent fluid mechanics of the mixing-limited gas phase reaction processes. The two-equation (k-─ e) turbulence model is used for closure. Particle drag and turbulent particle diffusion are also modeled. Gaseous combustion is modeled with a probability density function for the mixture fraction. Fluctuations in mixing of inlet streams and coal off-gas are considered. Coal pyrolysis and oxidation reaction processes are assumed to be slow with respect to the turbulent time scale. …

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The Dufour Effect. Iii. Direct Experimental Determination Of The Heat Of Transport Of Carbon Tetrachloride-Cyclohexane Liquid Mixtures, Richard L. Rowley, Frederick H. Horne Jan 1980

The Dufour Effect. Iii. Direct Experimental Determination Of The Heat Of Transport Of Carbon Tetrachloride-Cyclohexane Liquid Mixtures, Richard L. Rowley, Frederick H. Horne

Faculty Publications

The heat of transport of carbon tetrachloride-cyclohexane liquid mixtures has been determined directly by Dufour effect experiments. The technique employs a withdrawable ''liquid gate'' to create a nonturbulent, sharp diffusional interface. The partial differential equations governing the barycentric velocity, composition, and temperature distributions are solved with a Crank-Nicholson implicit numerical scheme. This allows inclusion of the composition and temperature dependence of the thermodynamic and transport parameters. For mean mole fraction of carbon tetrachloride x1 between 0.34 and 0.55 and for mean temperature T between 295.13 and 296.43 degreesK, the best least squares fit of the data for the heat of …

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Proliferation Resistant Reprocessing Methods, Guna S. Selvaduray, L. Heising Nov 1979

Proliferation Resistant Reprocessing Methods, Guna S. Selvaduray, L. Heising

Faculty Publications

No abstract provided.

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Finding A Site To Store Spent Fuel In The Pacific Basin, Guna S. Selvaduray, M. Goldstein, R. N. Anderson Sep 1979

Finding A Site To Store Spent Fuel In The Pacific Basin, Guna S. Selvaduray, M. Goldstein, R. N. Anderson

Faculty Publications

No abstract provided.

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Separation Technologies Reviewed, Guna S. Selvaduray, R. N. Anderson, M. Goldstein Aug 1978

Separation Technologies Reviewed, Guna S. Selvaduray, R. N. Anderson, M. Goldstein

Faculty Publications

No abstract provided.

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The Dufour Effect. Ii. Experimental Confirmation Of The Onsager Heat-Mass Reciprocal Relation For A Binary Liquid Mixture, Richard L. Rowley, Frederick H. Horne Jan 1978

The Dufour Effect. Ii. Experimental Confirmation Of The Onsager Heat-Mass Reciprocal Relation For A Binary Liquid Mixture, Richard L. Rowley, Frederick H. Horne

Faculty Publications

Although experimental verification of Onsager's reciprocal relations has been achieved in a variety of cases, no quantitative test of the heat-mass reciprocal relation for a binary liquid system has previously been reported. We present in this communication experimental proof of the equality of the mass-heat reciprocal relation for the system carbon tetrachloride - cyclohezane.

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Atomic Simulation Of The Al2 (111) (110) Edge Dislocation In Alpha-Iron, Brent L. Adams, P. C. Gehlen, J. P. Hirth, R. G. Hoagland Apr 1977

Atomic Simulation Of The Al2 (111) (110) Edge Dislocation In Alpha-Iron, Brent L. Adams, P. C. Gehlen, J. P. Hirth, R. G. Hoagland

Faculty Publications

The authors are pleased to acknowledge: the support of this research by the National Science Foundation under Grant DMR 74-21243 and by the provision of computer time by The Ohio State University and by Battelle Columbus Laboratories; and helpful comments on the manuscript by V Vitek. Computer simulation is used to obtain the plane strain and non-plane strain equilibrium core structures for the a/2 <111> {110} edge dislocation in alpha-iron as modelled by the Johnson potential. The methods of the integral formulation of anisotropic linear eleasticity theory are employed in the analysis. Flexible core boundary methods reveal that positive volume expansions …

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Potential-Selective Deposition Of Copper From Chloride Solutions Containing Iron, Ralph E. White, James A. Trainham, John Newman, Thomas W. Chapman Jan 1977

Potential-Selective Deposition Of Copper From Chloride Solutions Containing Iron, Ralph E. White, James A. Trainham, John Newman, Thomas W. Chapman

Faculty Publications

The hydrometallurgy of copper may involve leaching of the metal from its ore with an aqueous solution containing cupric and ferric chloride. The subsequent deposition of copper from such a process stream is modeled here in an idealized electrochemical cell with a rotating-disk electrode. The potential distribution and concentration profiles within the diffusion layer are predicted for given potential differences between the electrode and the solution. The cuprous ion, which is formed by the reduction of the complexed cupric ion at the electrode, is stabilized in the chloride solution and can react either at the electrode or with ferric species …

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Two Preliminary Studies Of The Intelligibility Of Predictor-Coefficient And Formant-Coded Speech, L. Keeler, G. Clement, W. Strong, E. Palmer Oct 1976

Two Preliminary Studies Of The Intelligibility Of Predictor-Coefficient And Formant-Coded Speech, L. Keeler, G. Clement, W. Strong, E. Palmer

Faculty Publications

Two preliminary studies comparing the intelligibilities of predictor-coefficient versus formant-frequency-coded speech and the intelligibilities of predictor-coefficient-coded speech using different numbers of coefficients are reported.

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The Topolotron: A High Beta Device With Topological Stability, Keith H. Brown, H. R. P. Ferguson, J. H. Gardner, Larry V. Knight, H. Mark Nelson Sep 1976

The Topolotron: A High Beta Device With Topological Stability, Keith H. Brown, H. R. P. Ferguson, J. H. Gardner, Larry V. Knight, H. Mark Nelson

Faculty Publications

The concept of topological or structural stability is introduced and its importance in the magnetic confinement of plasmas is discussed. Topological stability requires the presence of a pair of limit cycles in the magnetic field configuration. This paper deals with the design of an experimental device possessing limit cycles. The design includes a high beta (b=1), high density (10^16), hot (100 eV) hydrogen plasma which is to be compressed by a factor of about 5 in a torodial device of 25 cm average major radius with a capacitor bank rise time of less than 2 µsec. Two shaped toroidal coils …

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The Fluid Motion Due To A Rotating Disk, Ralph E. White, Charles M. Mohr Jr, John Newman Jan 1976

The Fluid Motion Due To A Rotating Disk, Ralph E. White, Charles M. Mohr Jr, John Newman

Faculty Publications

No abstract provided.

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Scattering Of Argon And Neon From W(112), Ralph E. White, Jean Jacques Ehrhardt, Robert P. Merrill Jan 1976

Scattering Of Argon And Neon From W(112), Ralph E. White, Jean Jacques Ehrhardt, Robert P. Merrill

Faculty Publications

No abstract provided.

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A Circular Active Reflector Atenna (Cara), Energy Distribution Calculations, And An Experimental Test, Larry V. Knight, George H. Barry Mar 1975

A Circular Active Reflector Atenna (Cara), Energy Distribution Calculations, And An Experimental Test, Larry V. Knight, George H. Barry

Faculty Publications

Conventional high-frequency (HF) circular phased arrays, such as the Wullenweber circular array, have a cost factor that increases at a greater-than-square law rate as its radius is increased to produce larger apertures. A new method of forming simultaneous beams in an HF circular array has been proposed in which beams are formed in the space within the array from pickup element energy that has been amplified and reradiated. Such a device is called a circular active reflector antenna (CARA), and its cost increases at a substantially linear rate as its radius is increased to form larger apertures. This paper describes …

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Scattering Of Light Atoms From Strongly Periodic Surfaces, J. G. Stoll, Jr., Ralph E. White, J. J. Ehrhardt, R. I. Masel, J. P. Merrill Jan 1975

Scattering Of Light Atoms From Strongly Periodic Surfaces, J. G. Stoll, Jr., Ralph E. White, J. J. Ehrhardt, R. I. Masel, J. P. Merrill

Faculty Publications

No abstract provided.

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Electrochemical Reduction Of Molybdate In The Presence Of Zinc Chloride In Molten Lithium Chloride-Potassium Chloride Eutectic, R. Cvetkovic, Branko N. Popov, H. A. Laitinen Jan 1975

Electrochemical Reduction Of Molybdate In The Presence Of Zinc Chloride In Molten Lithium Chloride-Potassium Chloride Eutectic, R. Cvetkovic, Branko N. Popov, H. A. Laitinen

Faculty Publications

Two chronopotentiometric waves were observed for the electrochemical reduction of molybdate in the presence of zinc chloride, with quarter-wave potentials of –1.5V and –1.75V vs. the Pt(II)/Pt reference electrode, respectively. It was observed that an increase in the molybdate concentration causes a decrease of the first transition time indicating a chemical reaction between ZnCl2 (which is reduced at –1.5V) and Li2MoO4 in the melt forming ZnMoO4 which is sparingly dissociated in LiCl-KCl eutectic. The equilibrium constant for the observed reaction was calculated. X-ray powder diffraction patterns of the reduction product of ZnMoO4 have been …

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An Intensity-Dependent Filter, James M. Thorne, Thomas R. Loree, George Mccall Jun 1973

An Intensity-Dependent Filter, James M. Thorne, Thomas R. Loree, George Mccall

Faculty Publications

It is useful in optically driven Kerr-cell shutters and other laser applications to have intense pulses with extremely low light levels between pulses. We describe here a device that accomplishes this objective external to the laser cavity.

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Electrochemical Reduction Of Molybdenum(Vi) Compounds In Molten Lithium Chloride-Potassium Chloride Eutectic, Branko N. Popov, H. A. Laitinen Jan 1973

Electrochemical Reduction Of Molybdenum(Vi) Compounds In Molten Lithium Chloride-Potassium Chloride Eutectic, Branko N. Popov, H. A. Laitinen

Faculty Publications

Molybdenum (VI) oxide reacts with molten LiCl-KCl eutectic at 450° to form MoO2CI2, which probably is present as an anion MoO2Cl4=, and pyromolybdate, Mo2O7=. Both of these species are electrochemically reduced to MoO2, which can be reoxidized to MoO2Cl2 by current reversal. A second reduction step, observed whether MoO3 or Mo2O72− is added to the melt, can be attributed to the reduction of MoO4−−, formed as a secondary reaction product in the first …

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Electron Cyclotron Radiation Measurements To Determine Relative Electron Temperatures In A Low-Density Magnetic-Mirror Plasma System, Andrew L. Gardner Feb 1972

Electron Cyclotron Radiation Measurements To Determine Relative Electron Temperatures In A Low-Density Magnetic-Mirror Plasma System, Andrew L. Gardner

Faculty Publications

Measurements of the electron cyclotron radiation emitted from the plasma of the Alice system were made using a synchronous detection microwave radiometer in the range of 10.2 - 11.6 GHz. Both sidebands were used to sample radiation from two nested closed shells within the plasma. For a tenuous plasma this radiation is proportional to the product of the electron density and the electron temperature. Since measurements of the plasma density were available from other detectors, relative values of the electron temperature were obtained using the measured radiation intensity.

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Electrochemical Reduction Of Chromate In The Presence Of Nickel Chloride In Molten Lithium Chloride-Potassium Chloride Eutectic, Branko N. Popov, H. A. Laitinen Jan 1970

Electrochemical Reduction Of Chromate In The Presence Of Nickel Chloride In Molten Lithium Chloride-Potassium Chloride Eutectic, Branko N. Popov, H. A. Laitinen

Faculty Publications

Chronopotentiometry of chromate in the presence of NiCl2 in molten LiCl-KCl eutectic reveals a diffusion controlled, three electron reduction step. In the presence of excess NiCl2, chromate is reduced at −0.35V vs. Pt(II)/Pt reference electrode and the electroactive species responsible for the chrono-potentiometric wave is estimated to have a diffusion coefficient of 1.06 · 10−5 cm2 sec−1 at 450°C. The stoichiometry of the reduction product depends mainly on the temperature at which the deposit is formed. At 500°C the deposit approaches the composition LiNi2CrO4. X-ray powder diffraction shows the deposit …

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Ehv Ac Parallel Transmission Line Calculations With Application To The Near Resonance Problem, A. Norton Chaston May 1969

Ehv Ac Parallel Transmission Line Calculations With Application To The Near Resonance Problem, A. Norton Chaston

Faculty Publications

The use of shunt reactors with EHV transmission lines has introduced new problems, one of which is induction of high voltages on a de-energized circuit of two parallel lines. This paper presents the matrix equations used in developing a digital computer program which takes into account the effects of electromagnetic induction, electrostatic coupling, distributed lines, and transposition. The computer program may also be used to calculate the effects of shunt reactors, series capacitors, and loads. The equations can be adapted to a wide range of applications, although the examples for this paper have been limited to the near resonance problem …

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Control System Digital Computer Transfer Function Simulation, Jens J. Jonson Mar 1962

Control System Digital Computer Transfer Function Simulation, Jens J. Jonson

Faculty Publications

The z transform of simple delay, integrator, leadlag, and differentiator networks are suggested as the basic building blocks for simulating complex control systems on a digital computer. The system parameters retain their explicit identity, thus facilitating analysis and design of the system as a function of specific parameter changes.

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