scholarly journals Numerical analysis of momentum transfer in the case of blast protection structures

2019 ◽  
Author(s):  
Andrzej Morka ◽  
Piotr Kędzierski ◽  
Grzegorz Sławiński
Keyword(s):  
Numerical Analysis ◽  
Momentum Transfer ◽  
Blast Protection ◽  
Protection Structures

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.

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.

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