Solid components separation from heterogeneous mixtures through turbulence control

Nedeff, Valentin; Lazăr, Gabriel; Agop, M.; Eva, Lucian; Ochiuz, Lăcrămioara; Dimitriu, Dan Gheorghe; Vrajitoriu, Lucia; Popa, Cristina

doi:10.1016/j.powtec.2015.06.029

Cited by 7 publications

(5 citation statements)

References 77 publications

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“…To do this, the correspondence between the interaction processes and the ''fractality'' of the motion trajectories was admitted. [21][22][23] The non-linear theoretical model proposed in this work is based on the assumption that all the motions of complex system particles take place on continuous, but non-differentiable curves (fractal curves). In this hypothesis, some consequences of nondifferentiability are evident:…”

Section: Non-linear Theoretical Modelmentioning

confidence: 99%

“…23 Considering the functionality of a scale covariance principle (the complex system physics laws are invariant with respect to scale transformations), the transition from the dynamics of classical complex system physics to the dynamics of nondifferentiable (fractal) complex system physics can be implemented by replacing the standard time derivative d/dt by the nondifferentiable operator d ˆ/dt. [21][22][23] Thus, this operator plays the role of the covariant derivative, namely, it is used to write the fundamental equations of the complex system dynamics in the same form as in the classical (differentiable) case. Under these conditions, applying the operator (1) to the complex velocity field, in the absence of any external constraints and for motions more complex than the Brownian one, i.e.…”

Section: Non-linear Theoretical Modelmentioning

confidence: 99%

“…The previous result shows that the local acceleration, the convection and the dissipation make their balance at any point on the non-differentiable curve. [21][22][23] Moreover, the presence of the complex coefficient of viscosity-type indicates that the complex system is a rheological medium, so it has memory, as a datum, by its own structure.…”

Section: Non-linear Theoretical Modelmentioning

confidence: 99%

See 2 more Smart Citations

A multiscale mechanism of drug release from polymeric matrices: confirmation through a nonlinear theoretical model

Băcăiță

Agop

2016

Phys. Chem. Chem. Phys.

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In this paper, we propose a new approach for the dynamics of drug delivery systems, assimilated to complex systems, an approach based on concepts like fractality, non-differentiability, and multiscale evolution. The main advantage of using these concepts is the possibility of eliminating the approximations used in the standard approach by replacing complexity with fractality, that imposes, in mathematical terms, the mandatory use of the non-differential character of defined physical quantities. The theoretical model presented, validated for other physical systems, demonstrates its functionality also for drug delivery systems, highlighting, in addition, new insights into the complexity of this system. The spatio-temporal scales of system evolution are characterized through the fractality degree, as a measure of the complexity of the phenomena occurring at each scale. Numerical analysis of the experiment showed that the overall drug release kinetics can be obtained by composing "smaller release kinetics" occurring at scales appropriate for each phase of the drug release mechanism, phases whose expansion depends on the system density. Moreover, the uncertainties in establishing the exact limits of the phases were removed by applying the principle of scale superposition, resulting in a global fractality degree corresponding to the entire release kinetics. Even if the theoretical model is perfectible by identifying constants specific to each delivery system, this paper is intended to be the beginning of an alternative approach to drug delivery mechanisms.

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Section: Non-linear Theoretical Modelmentioning

confidence: 99%

Section: Non-linear Theoretical Modelmentioning

confidence: 99%

Section: Non-linear Theoretical Modelmentioning

confidence: 99%

See 1 more Smart Citation

A multiscale mechanism of drug release from polymeric matrices: confirmation through a nonlinear theoretical model

Băcăiță

Agop

2016

Phys. Chem. Chem. Phys.

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“…density, momentum, energy, etc. [8][9][10][11][12] and the processes which they define. The practicality of such methods can be accepted sequentially, on space-time domains for which the differentiability still respected.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Transient Plasmas Generated by ns Laser Ablation of Memory Shape Alloys

Irimiciuc¹,

Forna²,

Agop³

et al. 2021

Practical Applications of Laser Ablation

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Understanding the underline fundamental mechanism behind experimental and industrial technologies embodies one of the foundations of the advances and tailoring new materials. With the pulsed laser deposition being one of the key techniques for obtaining complex biocompatible materials with controllable stoichiometry, there is need for experimental and theoretical advancements towards understanding the dynamics of multi component plasmas. Here we investigate the laser ablation process on Cu-Mn-Al and Fe-Mn-Si by means of space-and time-resolved optical emission spectroscopy and fast camera imaging. In a fractal paradigm the space–time homographic transformations were correlated with the global dynamics of the ablation plasmas.

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“…A mixture of solid particles, in order to be used in different industrial processes, is subjected to different separation processes, through which the most used is the separation on sieve. Different types of separators are used in the process of solid particle's heterogeneous mixture sieve separation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In order, to increase the efficiency of this process, the sieve motions can be ensured by using different devices [15][16][17][18][19][20]:…”

Section: Introductionmentioning

confidence: 99%

Influence of the Crank Mechanism Position in the Motion of an Oscillating Sieve

Moșneguțu¹,

Bârsan²,

Panainte-Lehăduș³

et al. 2021

JESR

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This article presents a study that aims to visualize the influence exerted by the position of the crank mechanism on the motion performed by the sieve supports respectively, on the displacement of an oscillating sieve. The study was oriented for a specific constructive case and involves the connecting rod position changing, the drive mechanism in relation to the horizontal, respectively at the angles 0 - 75° and -45 - 0°. Also, were identifying the variation of the angle described by the motion of the sieve support. From the obtained results analysis, it was found that in the case of 12.71° of the connecting rod angle, in relation to the horizontal, the lowest value of the angle described by the motion of the tie rod between the extreme points was obtained. Also, for the value of the connecting rod angle of approximately 6.5° equal angles described by the extreme positions of the sieve support in relation to the vertical were obtained. It is found that the variation of the connecting rod angle directly influences the variation of the angles described by the connecting rod in relation to the horizontal, the measured value being corresponding to the extreme points P1 and P2.

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Solid components separation from heterogeneous mixtures through turbulence control

Cited by 7 publications

References 77 publications

A multiscale mechanism of drug release from polymeric matrices: confirmation through a nonlinear theoretical model

A multiscale mechanism of drug release from polymeric matrices: confirmation through a nonlinear theoretical model

Dynamics of Transient Plasmas Generated by ns Laser Ablation of Memory Shape Alloys

Influence of the Crank Mechanism Position in the Motion of an Oscillating Sieve

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