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Articles 841 - 850 of 850
Full-Text Articles in Engineering
Stability Of Asymmetric Hydrodynamically Developing Channel Flows, T. S. Chen, E. M. Sparrow
Stability Of Asymmetric Hydrodynamically Developing Channel Flows, T. S. Chen, E. M. Sparrow
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Linear stability is studied for developing channel flows induced by asymmetric velocity profiles at the inlet. Neutral stability curves and axial variations of the critical Reynolds number are presented, showing greater stability for more skewed inlet profiles.
Structure Of Shock Waves With Nonequilibrium Radiation And Ionization, Harlan F. Nelson, R. Goulard
Structure Of Shock Waves With Nonequilibrium Radiation And Ionization, Harlan F. Nelson, R. Goulard
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The investigations of this study are concerned with: (1) the physical processes that occur in the precursor and in the nonequilibrium region behind a strong shock wave during its approach to equilibrium in an argon like gas; (2) the influence of different atom-atom collisional rates in the relaxation region on the precursor; and (3) the cause of precursor ionization, which in this study has been assumed to be the photoionization of both the ground and excited states. The argon like gas is regarded as a combination of two gases: one consisting of electrons and the other of atoms and ions. …
Methods For Evaluating The Performance Of Small Acoustic Filters, William S. Gatley, Raymond Cohen
Methods For Evaluating The Performance Of Small Acoustic Filters, William S. Gatley, Raymond Cohen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Experimental methods are needed for determining the characteristics of small acoustic filters used in systems with pulsating gas flows. These characteristics could then be used to predict the performance of proposed filter designs in a particular system, according to plane wave acoustic theory. Dependence on trial-and-error experimentation in solving noise control problems would thus be minimized. A literature survey revealed only a few earlier attempts to evaluate the acoustic performance of small filters and filter elements. Three methods for determining reflection and transmission factors are described, evaluated, and compared. A method employing a standing wave tube of unique design is …
Film Boiling Heat Transfer From An Oscillating Sphere, L. G. Rhea, R. G. Nevins
Film Boiling Heat Transfer From An Oscillating Sphere, L. G. Rhea, R. G. Nevins
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An experimental investigation has been undertaken to determine the effect of oscillation of the heat transfer surface on turbulent film boiling heat transfer. A transient technique was used to calculate the heat flux from copper spheres of 1 in., 3/4 in., and 1/2 in. dia. In all tests, saturated liquid nitrogen at atmospheric pressure was used as the boiling fluid. The data obtained were found to be in good agreement with published theory at zero frequency. The range of frequencies studied was from zero to approximately 12 cps at peak-to-peak amplitudes of 2 in. and 1 in., i.e., at amplitude-to-diameter …
Free-Convection Heat Transfer From An Inclined Heated Flat Plate In Air, S. C. Yung, R. B. Oetting
Free-Convection Heat Transfer From An Inclined Heated Flat Plate In Air, S. C. Yung, R. B. Oetting
Mechanical and Aerospace Engineering Faculty Research & Creative Works
No abstract provided.
Mutually Dependent Heat And Mass Transfer In Laminar Duct Flow, E. M. Sparrow, T. S. Chen
Mutually Dependent Heat And Mass Transfer In Laminar Duct Flow, E. M. Sparrow, T. S. Chen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An analysis is performed of the strongly coupled heat and mass transfer processes which result from sublimation of mass from the walls of a duct into a flowing gas, the latent heat being provided solely by convective transfer from the gas. The flow is assumed to be laminar and hydrodynamically developed. Results are given for the stream ward variations of the bulk and wall temperatures and mass fractions, of the heat and mass transfer rates, and of the local heat transfer coefficient. Representative temperature and mass fraction profiles are also presented. Entrance lengths characterizing the near approach to fully developed …
Dynamic Response Of Plates Due To Moving Loads, Theodore F. Raske, Alois L. Schlack
Dynamic Response Of Plates Due To Moving Loads, Theodore F. Raske, Alois L. Schlack
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An analysis based on linear theory is presented for determining the dynamic response and the conditions of resonance for a simply supported rectangular plate acted upon by two types of moving loads corresponding to: (1) a point force of variable magnitude oscillating about a fixed position on the plate, and (2) a point force of constant magnitude traveling in a circular orbit about a fixed position on the plate. In addition to the ordinary resonance as produced by a variable magnitude load concentrated at a fixed position on the plate, resonance of the plate may occur due to the changing …
A Plastic Stress Analysis Of Cylindrical Wafers Under Elastically Deformable Compression Plates, Robert L. Davis, J. W. Jackson
A Plastic Stress Analysis Of Cylindrical Wafers Under Elastically Deformable Compression Plates, Robert L. Davis, J. W. Jackson
Mechanical and Aerospace Engineering Faculty Research & Creative Works
This paper represents an analysis of the pressure distribution occurring in axially loaded cylindrical wafers with, and without, elastic radial constraints. The purpose of this report is to demonstrate the resulting stress patterns that occur in short compression specimens frequently used in determining material properties, and in the opposed-anvil, or Bridgman-type, high-pressure cells. The influence of radial constraints, material strain hardening, wafer diameter-to-height ratio, anvil or plate deflection, and the wafer-anvil interface friction on the resulting stress distributions have been examined. The integrated normal stress distribution across the specimen surface has been verified experimentally via numerous tests in which each …
Electronic Three-Phase Wave Generator, Don Cronin
Electronic Three-Phase Wave Generator, Don Cronin
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The present invention relates to electric signal generators, and more particularly to an electronic three-phase Wave generator.
Generator Control System Employing Semiconductor Apparatus, Don Cronin
Generator Control System Employing Semiconductor Apparatus, Don Cronin
Mechanical and Aerospace Engineering Faculty Research & Creative Works
This invention relates generally to new and improved transistor control apparatus for controlling the excitation of rotary generators. In the field of transistor control of generators, especially where it is desired to control relatively large field excitation currents, the problem arises of obtaining suitable transistors having a sufficiently large current carrying capacity to properly control the current flowing in the generator exciting field. It has been found that the answer does not lie in paralleling two or more transistors directly, since only by extremely carefully matching of transistors or by utilizing auxiliary electronic components in the circuit can it be …