A Numerical Analysis of Momentum Transfer To A Surface From Expanding Laser Plasma

2005 ◽  
Author(s):  
Ilja Sharikov ◽  
Sergey Surzhikov
Keyword(s):  
Numerical Analysis ◽  
Momentum Transfer ◽  
Laser Plasma

scholarly journals Numerical analysis of momentum transfer processes in a mechanically agitated air – biophase – liquid system

2017 ◽  
Vol 38 (3) ◽  
pp. 465-475 ◽  
Author(s):  
Monika Musiał ◽  
Magdalena Cudak ◽  
Joanna Karcz
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Momentum Transfer ◽  
Sucrose Concentration ◽  
Gas Bubbles ◽  
Continuous Phase ◽  
Liquid System ◽  
Numerical Computations ◽  
Transfer Processes ◽  
Simulation Results

AbstractThe results of numerical computations concerning momentum transfer processes in an air – biophase – liquid system agitated in a bioreactor equipped with baffles and a Smith turbine (CD 6 impeller) are presented in this paper. The effect of sucrose concentration on the distributions of the velocity of the continuous phase, gas hold-up and the size of gas bubbles in the system was analysed. Simulation results were presented in the form of the contours of the analysed magnitudes. The effect of sucrose concentration on the averaged values (i.e. determined on the basis of local values) of gas hold-up and gas bubbles size was evaluated. The results of the numerical computations of gas hold-up were compared with our own experimental data.

Effects of Flexibility and Damping on Momentum Transfer During Locking of Two Moving Links, Part II: Analytical Approach

1998 ◽  
Vol 65 (2) ◽  
pp. 485-488
Author(s):  
W. Szyszkowski ◽  
K. Fielden
Keyword(s):  
Numerical Analysis ◽  
Momentum Transfer ◽  
Analytical Approach ◽  
Governing Equations ◽  
Physical Understanding ◽  
Damping Effects ◽  
Characteristic Features

The numerical analysis presented in Part I of this paper revealed that small and seemingly negligible flexibility and damping effects influence significantly the post-locking motion of the assembly consisting of two joint-connected links. Here we concentrate on a more physical understanding and explanation of the phenomenon observed. It is shown that the main characteristic features of the post-locking motion can be recovered by decomposing it into the “fast” and “slow” modes. The governing equations of these two modes of motion are derived and discussed in detail.

Numerical analysis of strong Langmuir turbulence excited by transverse plasmons in a laser plasma

2007 ◽  
Vol 73 (5) ◽  
pp. 659-669 ◽  
Author(s):  
X. L. LIU ◽  
S. Q. LIU
Keyword(s):  
Numerical Analysis ◽  
Laser Plasma ◽  
Electromagnetic Waves ◽  
Ponderomotive Force ◽  
Wave System ◽  
Critical Surface ◽  
Sound Waves ◽  
Langmuir Waves ◽  
Strong Langmuir Turbulence ◽  
Collapse Behavior

AbstractLangmuir waves excited by transverse pumping plasmons near the critical surface in a laser-plasma may collapse, leading to the formation of a density cavity owing to the ponderomotive force. The collapse behavior of electromagnetic waves, Langmuir waves and ion-sound waves are studied numerically. The interactions of the three-wave system will lead to the tendency for an equilibration of energy over both the transverse and Langmuir plasmons with the same frequency near ωpe, which is shown in our numerical analysis.

Ultraviolet Absorption of Refractory Elements by a Dual Laser Plasma Method

1988 ◽  
Vol 102 ◽  
pp. 243-246
Author(s):  
J.T. Costello ◽  
W.G. Lynam ◽  
P.K. Carroll
Keyword(s):  
Absorption Spectra ◽  
Laser Plasma ◽  
Optical Pulse ◽  
Ionic Species ◽  
Neutral Species ◽  
Plasma Method ◽  
Plasma Technique ◽  
Refractory Elements ◽  
Delay Times ◽  
Dual Laser

AbstractThe dual laser-produced plasma technique for the study of ionic absorption spectra has been developed by the use of two Q-switched ruby lasers to enable independent generation of the absorbing and back-lighting plasmas. Optical pulse handling is used in the coupling cicuits to enable reproducible pulse delays from 250 nsec. to 10 msec, to be achieved. At delay times > 700 nsec. spectra of essentially pure neutral species are observed. The technique is valuable, not only for obtaining the neutral spectra of highly refractory and/or corrosive materials but also for studying behaviour of ionic species as a function of time. Typical spectra are shown in Fig. 1.

LACBED with Quantitative Anomalous Absorption Corrections

1990 ◽  
Vol 48 (2) ◽  
pp. 528-529
Author(s):  
C.J. Rossouw ◽  
L.J. Allen ◽  
P.R. Miller
Keyword(s):  
Momentum Transfer ◽  
Scattering Amplitude ◽  
Incident Beam ◽  
Waller Factor ◽  
Beam Momentum ◽  
Anomalous Absorption ◽  
Quantitative Calculation ◽  
Ewald Sphere ◽  
Image Position ◽  
Incident Beam Energy

An Einstein model for thermal diffuse scattering (TDS) has enabled quantitative calculation of the absorptive potential V'(r). This allows anomalous absorption to be accounted for in LACBED contrast. Fourier coefficients Vg-h of the absorptive component from each atom α are calculated from integrals of the formwhere fα is the scattering amplitude and M(Q) the Debye-Waller factor. Integration over the Ewald sphere (dΩ) requires the momentum transfer q to have values up to 2ko (the incident beam momentum). Dynamical ‘dechannelling’ is accounted for by the terms g ≠ h. The crystal absorptive potential is obtained by coherently summing over these atomic absorptive potentials within the unit cell. Unlike the elastic potential, the absorptive potential is a strong function of incident beam energy Eo, since the range of momentum transfer q and associated solid angles dΩ change with the Ewald sphere radius.Fig. 1 shows a LACBED pattern of the zeroth order beam from Si aligned along a <001> zone axis.

Sign in / Sign up

Export Citation Format

Share Document