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Friday, July 31, 2020 | History

2 edition of Controlled turbulence as a design criterion for electric discharge convection lasers found in the catalog.

Controlled turbulence as a design criterion for electric discharge convection lasers

by Leman John Aunchman

  • 152 Want to read
  • 13 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Aeronautics

  • ID Numbers
    Open LibraryOL25326340M

    Extreme Turbulence This rarely encountered condition is usually confined to the strongest forms of convection and wind shear, such as the following. Mountain waves in or near the rotor cloud, usually found at low levels, leeward of the mountain ridge when the wind normal to . convection, it would take many hours to heat a saucepan of water to boiling point, simply because heat di usion in water is so weak (ˇ 10 3cm2 s 1). Figure 1: Heat transfer in a saucepan. 2 Rayleigh-B enard convection In , Henri B enard [2] performed an experiment concerning convection cells in a .

    One of the commonest forms of turbulent motion is the so-called thermal turbulence, which consists of fluctuations of the vertical air velocity due to the buoyancy forces acting on the air particles. Thus, thermal turbulence results from the development of atmospheric convection, i.e., vertical displacements of individual batches of air due to. criteria for good large-scale gas flow, but rather in (1) understanding the small-scale process of particle diffusion as it affects precipitation, (2) assessing the importance of turbulence and convection due to the electric wind, and (3) attempt-ing to harness, insofar as .

    American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Due to the complexity of turbulence, quantitative design approaches are difficult. However, the importance of turbulence on the transport processes in equipment design makes a study of this phenomenon necessary. Heat transfer to fluids flowing in tubes in forced convection is one of the more widely used transport pro­ cesses in industry.


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Controlled turbulence as a design criterion for electric discharge convection lasers by Leman John Aunchman Download PDF EPUB FB2

Electric-dischargeconvectionlasers(EDCLs)offermuchpromisefor commercial and special-usemilitaryapplications of continuouswave (CW) asersystemsutilizegases that are.

Approved for public release; distribution in thesis is primarily concerned with the application of controlled turbulence to electric discharge convection lasers (EDCLs). A preliminary design of a closed-cycle, EDCL system has been accomplished.

Experimental investigations into the mechanisms of turbulent flow and its stabilization of gaseous, electric discharges were made. Spectral distribution, velocity profile, and power consumption data taken in a discharge Author: Jr. Leman John Aunchman. CHAPTER 2. CONVECTION AND TURBULENCE 15 [email protected] [email protected] i = R ji+ D ji andthatR jiD ij = 0 by symmetry considerations.

Substituting these into equation () results. Convective Turbulence 1 Rayleigh-Taylor Convection Convection is a gravitational instability that occurs when denser fluid overlies lighter fluid, and the associated vertical acceleration overcomes the molecular diffusion of buoyancy and induces mo-tion.

An initial value representation of this is known as Rayleigh-Taylor convection. The answer that numerous previous studies suggest is quite pessimistic because the analogy concept of momentum and heat transport holds well in a wide range of flows.

Nevertheless, the recent progress in analyzing turbulence mechanics and designing turbulence control offers a chance to develop a scheme for dissimilar momentum and heat by: Topics: Centrifugal force, Combustion chambers, Flow (Dynamics), Flames, Stress, Cavities, Turbulence, Design, Jets, Temperature profiles A Study of the Mean and Dynamic Behavior of the Swirling Flow Generated by a Counter Rotating Radial-Radial Swirler Using a Water Test Rig.

Turbulence and Dry convection. There are two methods of vertical mixing outside of the surface layer: Complete mixing is performed if two boxes are statically unstable (using the virtual potential temperature) (DRYCNV); otherwise a turbulence closure is used to estimate the amount of mixing based on the grid-scale properties and available TKE (ATURB).

Search the history of over billion web pages on the Internet. and turbulence (local extrema of turbulent kinetic energy, large variations of turbulence dissipation, etc.) In engineering applications: Wall quantities (velocity gradients, pressure, etc.) are very important in several applications Flow separation and reattachment are strongly dependent on a.

Convection in a fluid heated from below, known as Rayleigh-Bénard convection, is an important turbulent process that occurs in the sun, planetary atmospheres, industrial manufacturing, and many other places. Physicists and engineers have made much progress in understanding this phenomenon in simple laboratory geometries, but still have a way to go before they are able to.

The onset of electric discharge instability in rare-gas monofluoride lasers pumped by electron beam sustained electric discharges is delayed by employing a laser gas mixture (Such as Ar,   Turbulent convection occurs when the Rayleigh number (Ra)—which quantifies the relative magnitude of thermal driving to dissipative forces in the fluid motion—becomes sufficiently high.

Research on several different types of high-power N 2 -CO 2 electric-discharge convection lasers (EDCL) has been in progress at the United Aircraft Research Laboratories since early Flying through turbulence can be stressful and fatiguing, so it's good to understand where and how it happens.

Here are the 7 most common types of turbulence:1) Clear Air Turbulence. CAT normally occurs outside of clouds at altitudes ab feet MSL, and.

This paper presents a numerical analysis of turbulent flow and heat transfer in the rotor-stator system of a hydro-generator scale model. The study is carried out through Computational Fluid Dynamics simulations using Reynolds-Averaged Navier-Stokes turbulence models based on the eddy-viscosity approximation.

The v2-f turbulence model describes the anisotropy of the turbulence intensity in the turbulent boundary layer using two new equations, in addition to the two equations for turbulence kinetic energy (k) and dissipation rate (ε). The first equation describes the transport of turbulent velocity fluctuations normal to the streamlines.

laser physics, nonlinear optics, turbulence, low - temperature plasma, laser matter interaction, laser thermal technology. Turbulence is an irregular motion of the air resulting from eddies and vertical currents. It may be as insignificant as a few annoying bumps or severe enough to momentarily throw an airplane out of control or to cause structural damage.

Turbulence is associated with fronts, wind shear, thunderstorms, etc. Numerical model of an axial fast-flow CO2 laser with controlled turbulence Margarita G. Baeva, Peter A. Atanasov Proc. SPIE9th International Symposium on Gas Flow and Chemical Lasers, pg (4 May ); doi: / We discuss a few applications of active control of turbulent fluid flow and their implications for the economy and the environment.

We outline a conceptual basis for control, sketching sensors, actuators, and the algorithm. The control of turbulence requires an understanding of turbulent flows beyond our present capabilities, but we describe the physical basis for control of the boundary layer.

Society of Naval Architects and Marine Engineers, and U.S. Navy, Advanced Marine Vehicles Meeting.Excimer lasers are gas lasers which utilize electric discharge to generate emitting excimers. The excimer can be e. g. Xe 2 *, which is meta-stable in excited state, but after emission of a photon, or relaxation to the ground state by some other means, dissociates immediately in two Xe atoms.All the process controlled by a control panel including (electrical resistor power supply switch, blower power supply, thermocouple selector, three digit temperature display (resolution ± oC), voltmeter and ammeter for the measurement of electrical resistors supply voltage and current, and electrical .