The efficacy of airborne pharmaceuticals in the treatment of lung diseases can may be improved with the selective deposition of inhaled drugs.
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During sedimentation, the different particle species segregate and create areas of different composition. Spatially one-dimensional mathematical models of this process can be …
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The second step is to determine p,j(r) from a differential equation of Fokkor -Planck type representing the effects of relative motion of the two particles duo to gravity. ... Sedimentation in a polydisperse system. Part 1 381 no interactive force, the relative velocity of two neighbouring particles falling under
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Moreover, based on the sedimentation kinetics, a rough estimate of the balance between amyloid spherulites and individual fibrils can be provided. ... Importantly, the method can be generally applied to the characterization of polydisperse solutions containing optically traceable spherical particles in the micrometric range. Publication types ...
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Measuring the concentration profiles induced by gravity settling is known to be an efficient route to obtain the equation of state of a colloidal suspension, to inspect the fine details of the phase diagram and to provide clues on the nature of
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Corpus ID: 139839504; Measurement and simulation of sedimentation behaviour of concentrated polydisperse suspensions @article{Williams1989MeasurementAS, title={Measurement and simulation of sedimentation behaviour of concentrated polydisperse suspensions}, author={Richard A. Williams and W. P. K. Amarasinghe}, journal={Mineral Processing and …
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On the basis of the theoretical examination of kinetics of polydisperse particles flotation it was shown that flotation rate constant depends on the half width at half-maximum (FWHM) of the ...
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Abstract—The behavior of polydisperse secondphase inclus ions in molten selenium during settling is mod eled using solid carbon particles as an example. A theore tical limit of the …
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A second method applies a high-order differencing scheme that is accurate for smooth regimes and a low-order dissipative scheme that can smooth the shocks. ... Theory of hindered sedimentation of polydisperse mixtures. A.I.Ch.E. Journal, 29 (4) (1983), pp. 669-675. View in Scopus Google Scholar. Zeidan 2003a.
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The shift to higher decorrelation times for this sample is possibly due to the sedimentation of large colloidal particles. Although sedimentation was not observed visually during 4 days (Figure 1), the particle kinetics implied that the sedimentation had started.
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ica and carbon [1–4]. The concentration of second phase inclusions can be effectively reduced by Rayleigh distillation at a slow evaporation rate. The effectiveness ... Sedimentation Kinetics of Polydisperse SecondPhase Inclusions in Molten Selenium Yu. P. Kirillov, G. A. Voronin, V. S. Shiryaev, L. A. Ketkova, A. V. Kurilin, and M. F ...
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Powder Technology, 65(1991) 411-432 Sedimentation behaviour of complex polydisperse suspensions R. A. Williams*, W. B. K. Amarasinghe**, S. J. R. Simons and C. G. Xiefi Department of Chemical Engineering, University of Manchester Institute of Science and Technology, P.O. Box 88, Manchester M60 IQD (U.K.) Abstract Experimental data were acquired using a novel …
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To better understand separation in polydisperse systems, sedimentation in bidisperse . ... Related sedimentation kinetics obtained by tracing the movement of the . ... A second crossover, to a ...
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Figure 1 gives a schematic of the sedimentation process and time evolution of a polydisperse suspension of particles of different sizes in a cell with impermeable solid vertical walls. As is shown ...
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The analysis of sedimentation or flotation (creaming) by detecting the transmission profile over the entire sample height in an analytical centrifuge (using a Stability Analyzer) is described and ...
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Sketch showing the sedimentation behavior of a polydisperse suspension of particles for varying times, T. The initial well-mixed suspension develops N + 2 distinct regions: the deposit at the ...
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Sedimentation in a dilute polydisperse system of interacting spheres. Part 2. Numerical results," J. Fluid Mech. 124, 495 (1982). Google Scholar. Crossref.
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Polyisobutenyl succinic anhydride (PiBSA) based emulsifiers are a key ingredient in the formulation of high internal phase emulsions (HIPEs) that are typically used as liquid explosives in mining applications [23], [24], [25].The adsorption behaviour of PiBSA based emulsifiers depends on several factors such as formulation method, head group chemistry, …
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Keywords: Polydisperse suspensions; Kinematical sedimentation process; Kinematic shocks; Rarefaction waves; Slip velocities; Shock-capturing schemes 1. Introduction The one-dimensional sedimentation of ideal suspensions of monosized spheres under the influence of gravity can be described quite well by Kynch's sedimentation theory 1–3 .
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Specifically, ultrasound enhanced sedimentation of 10 μm polystyrene particles was used to demonstrate the efficiency of the system, which shows that, with the additional acoustic force fields ...
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The change in the size distribution of particles by simultaneous Brownian and turbulent diffusion and gravitational sedimentation is represented by the following equation: (11) ∂ n(r,t) ∂ t =−{β(r)+c v}n(r,t), where n(r,t) is the particle size distribution function at time t, β(r) is the deposition coefficient of particles with radius r, and c v is the ventilation rate which is assumed ...
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First determining the particle size from the sedimentation velocity with Stokes law and second transforming the extinction/transmission into concentration with Lambert-Beer law. Because of the space and time resolved measurement system two analytical procedures are available to calculate the particle size distribution [7] .
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Sedimentation kinetics trace d at a n X-ray tran smission level of 70 % (corresponding to about 3 % m/m Kronos trial pigment) a re shown in Fig. 19 - left. Using this method
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This paper reviews some recent advances in mathematical models for the sedimentation of polydisperse suspensions. Several early models relate the settling velocity to …
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A generalization of the model for describing the sedimentation of polydisperse suspensions with a given particle size distribution function of the solid phase can be constructed on the basis of a …
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A novel model for the sedimentation of polydisperse suspensions has been submitted. In the developed model of gravitational sedimentation, an attempt was made to take into account the main known physical features of the process, and a simplified calculation method based on this model has been proposed too. The approach novelty lies in that generalization …
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Kirillov, Y. P., Voronin, G. A., Shiryaev, V. S., Ketkova, L. A., Kurilin, A. V., & Churbanov, M. F. (2011). Sedimentation kinetics of polydisperse second-phase ...
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ABSTRACT The analysis of sedimentation or flotation (creaming) by detecting the transmission profile over the entire sample height in an analytical centrifuge (using a Stability Analyzer) is described and illustrated for a diverse range of practical dispersions and emulsions. It is also illustrated how to use extrapolated results to estimate dispersion shelf life stability for …
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