3 edition of Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions found in the catalog.
Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions
by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va
Written in English
|Statement||principal investigator, Domenic A. Santavicca.|
|Series||[NASA contractor report] -- NASA CR-194408., NASA contractor report -- NASA CR-194408.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
numerical models for spray evaporation. Detailed model description and validations can be found in Trinh and Chen (), and it is suffice to say that within each numerical droplet, turbulence characteristics such as fluctuating velocity level, length and time scales are supplied by the model. Understanding Environmental Turbulence. A dynamic model. During the last years a debate has raged within the field of Stra tegic Management between a rational view (IO, Positioning School, Strategic Planning, Cybernetics) and a Complex Adaptive Systems (CAS) view (Emergent strategies,complexity theory, chaos theory) of the field.
The encapsulating agent should not react with the core, and it should have the ability to seal and hold the core within the capsule, protecting it from adverse conditions. Interactions between the wall material and the core can affect the release rate as well as the core volatility and particle size [ 63, Cited by: 1. Solid lipid nanoparticles (SLNs) can be produced by various methods, but most of them are difficult to scale up. Supercritical fluid (SCF) is an important tool to produce micro/nanoparticles with a narrow size distribution and high encapsulation efficiency. The aim of this work was to produce cetyl palmitate SLNs using SCF to be loaded with praziquantel (PZQ) as an insoluble model by: 3.
The aim of this study was to develop solid dispersion nanoparticles for enhancement of the physicochemical properties and bioavailability of poorly water-soluble sirolimus, using the supercritical antisolvent (SAS) process. First, excipients for enhancing the stability and solubility of Cited by: Even over an exposure sufficiently short that there is time for only one angle of incidence, that angle of incidence may vary spatially over the receiver aperture, thus giv-ing rise to blur described by the short-exposure turbulence modulation transfer function (MTF), which is a function of aperture diameter.2 Because of such small values of.
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Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions: Authors: Santavicca, Domenic A. Affiliation: AA(Pennsylvania State Univ., University Park) Publication: Final Report Pennsylvania State Univ., University Park.
Propulsion Engineering Research Center. Publication Date: 09/ Category. Get this from a library. Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions: final report, NASA grant, #NAG [Domenic A Santavicca; United States.
National Aeronautics and Space Administration.]. sprays under conditions typical of those encountered in high pressure combustion systems such as liquid fueled rocket engines.
Of particular interest are measurements of droplet drag and lift, droplet dispersion, droplet heating, and droplet vaporization under both subcritical and supercritical conditions. The goal of this research was to experimentally characterize the behavior of droplets in vaporizing sprays under conditions typical of those encountered in high pressure combustion systems such as liquid fueled rocket : Domenic A.
Santavicca. Droplet–turbulence interaction in a confined polydispersed spray: effect of turbulence on droplet dispersion - Volume - S. Sahu, Y. Hardalupas, A.
TaylorCited by: Experimental results on a gaseous hydrogen / liquid oxygen spray flame are compared with a simplified model. The gasification rate, which depends on rates of turbulent mixing and vaporization, has a strong effect on flame structure.
The rate-limiting process is vaporization at subcritical pressures and turbulent mixing at supercritical by: 1. Droplet-turbulence interaction in a confined polydispersed spray: Effect of turbulence on droplet dispersion Article (PDF Available) in Journal of Fluid Mechanics May with The sub- sequent combustion will depend significantly on the spray breakup and liquid droplet vaporization.
For a diesel engine, the environment into which the spray is introduced is typically at a pressure of 20 atm or more, and a temperature of K or by: 16 droplets vaporizing in a pure Nitrogen environment. In their experiments, a droplet in the diameter range of to mm and having an initial temperature of o.
K, was generated at the tip of a silica ﬁber and intro- duced into an electric furnace. The elapsed time for the introduction was seconds. For high aspect ratios, i.e., wide open channel flow, the strength of secondary currents diminish toward the flume center, resulting in a 2D flow farther away from the walls and no velocity-dip phenomenon.
Froude number effects on the flow characteristics are less pronounced compared to the aspect ratio effects. Based on a set of direct numerical simulations, the authors provide new insights on how turbulence affects the motion of the droplets, their shape and size; then in turn how the droplets alter the ﬂow including effects of interfacial surface energy on the kinetic energy of the ﬂow.
The dispersion of the spray was predicted by the three droplet turbulence models. Additionally, a deterministic spray simulation was carried out to isolate the effects of droplet starting conditions from the turbulent dispersion. The droplet vaporization was accounted for by a Uniform-Temperature model (Schmehl et al., ).
The area immediately downstream of the atomizer is characterized by secondary droplet by: Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions [microform] Simultaneous luminescence pressure and temperature measurement system for hypersonic wind tunnels [micro Gas-jet and tangent-slot film cooling tests of a ⁰ cone at Mach number of [microform] / Rob.
Droplet turbulence interaction in a con˝ned polydispersed spray: e˙ect of turbulence on found to be negative near the spray edge, while it was close to zero at other locations. Turbulent spray combustion occurs in many technical applications such as internal engine combustion, gas turbine combustion, liquid-fueled rockets, and industrial burners.
Major challenges are the modeling of detailed processes including the atomization process, the turbulent flow field, particle motion and interaction, chemical reactions as Cited by: 2.
(D’Aveni, ) It is an environment where coping with turbulence is the essence of survival (Hardy, ). It seems as this is an environment where no company can keep a lead position. However, it can – through coping with turbulence.
RESOLVING TURBULENCE-CHEMISTRY INTERACTIONS IN MIXING-CONTROLLED COMBUSTION WITH LES AND DETAILED CHEMISTRY CONVERGE CFD 4 Figure 1(a): Instantaneous distribution of velocity, mixture fraction, mass fractions of CO2 and CO, and SGS velocity at the y = 0 plane from case A ( mm). Figure 1(b): Small subsection [white box from Figure 1(a) above] of the instantaneousFile Size: 3MB.
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Turbulent environment 1. 1 Organisational Change Chapter 1 Organisations and Their Changing Environments 2. 2 Chapter 1 Objectives • Describe the general characteristics of organisations and their essential components; • Say how different methods of wealth creation, viewed from a historical perspective, have influenced present-day organisational strategies and focus; • Discuss the.
1 1/1/ 1 28 1 1/1/ 1 28 1 9/16/ 9 21 1 11/24/. Microencapsulation using supercritical CO 2 is an alternative, since it has advantages over the traditional methods mentioned above, mainly the use of temperatures close to the environmental, the possibility of continuous modulation, reduced energy consumption, oxidation reaction prevention and high product quality by avoiding polluting organic Cited by: 2.Start studying DrG 1 of 8.
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