Development of volume-average theory for deep-bed filtration

AIChE Journal ◽  
2000 ◽  
Vol 46 (10) ◽  
pp. 1918-1926 ◽  
Author(s):  
E. A. Stephan ◽  
G. G. Chase
Keyword(s):  
Deep Bed Filtration ◽  
Volume Average ◽  
Average Theory

scholarly journals The Mode Heuristic in Service Consumers’ Interpretations of Online Rating Distributions

2021 ◽  
pp. 109467052110124
Author(s):  
Sarah Köcher ◽  
Sören Köcher
Keyword(s):  
Empirical Evidence ◽  
Graphical Display ◽  
Visual Salience ◽  
Graphical Displays ◽  
Volume Average ◽  
Online Rating ◽  
Process Level ◽  
Shed Light

In this article, the authors demonstrate a tendency among consumers to use the arithmetic mode as a heuristic basis when drawing inferences from graphical displays of online rating distributions in such a way that service evaluations inferred from rating distributions systematically vary by the location of the mode. The rationale underlying this phenomenon is that the mode (i.e., the most frequent rating which is represented by the tallest bar in a graphical display) attracts consumers’ attention because of its visual salience and is thus disproportionately weighted when they draw conclusions. Across a series of eight studies, the authors provide strong empirical evidence for the existence of the mode heuristic, shed light on this phenomenon at the process level, and demonstrate how consumers’ inferences based on the mode heuristic depend on the visual salience of the mode. Together, the findings of these studies contribute to a better understanding of how service customers process and interpret graphical illustrations of online rating distributions and provide companies with a new key figure that—aside from rating volume, average ratings, and rating dispersion—should be incorporated in the monitoring, analyzing, and evaluating of review data.

Ionic strength in deep bed filtration

1990 ◽  
Vol 24 (11) ◽  
pp. 1425-1430 ◽  
Author(s):  
Jing Song Chang ◽  
S. Vigneswaran
Keyword(s):  
Ionic Strength ◽  
Deep Bed Filtration

scholarly journals On the Accelerated Settling of Fine Particles in a Bidisperse Slurry

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Leonid L. Minkov ◽  
Yuliya O. Stepanova ◽  
Johann Dueck ◽  
Elizaveta V. Pikushchak
Keyword(s):  
Fine Particles ◽  
Stokes Equations ◽  
Fine Fraction ◽  
Particle Diameter ◽  
Sedimentation Velocity ◽  
Navier Stokes ◽  
Circulation Zone ◽  
Navier Stokes Equations ◽  
Volume Average ◽  
Bidisperse Suspension

An estimation of increasing the volume average sedimentation velocity of fine particles in bidisperse suspension due to their capturing in the circulation zone formed in the laminar flow of incompressible viscous fluid around the spherical coarse particle is proposed. The estimation is important for an explanation of the nonmonotonic shape of the separation curve observed for hydrocyclones. The volume average sedimentation velocity is evaluated on the basis of a cellular model. The characteristic dimensions of the circulation zone are obtained on the basis of a numerical solution of Navier-Stokes equations. Furthermore, these calculations are used for modelling the fast sedimentation of fine particles during their cosedimentation in bidisperse suspension. It was found that the acceleration of sedimentation of fine particles is determined by the concentration of coarse particles in bidisperse suspension, and the sedimentation velocity of fine fraction is proportional to the square of the coarse and fine particle diameter ratio. The limitations of the proposed model are ascertained.

Deep‐bed filtration with fiberball medium

1999 ◽  
Vol 34 (8) ◽  
pp. 1607-1618
Author(s):  
X.H. Zhang ◽  
Z.S. Wang
Keyword(s):  
Deep Bed Filtration

scholarly journals Evolution of a mushy zone in a static temperature gradient using a volume average approach

2017 ◽  
Vol 141 ◽  
pp. 206-216 ◽  
Author(s):  
A.B. Phillion ◽  
M. Založnik ◽  
I. Spindler ◽  
N. Pinter ◽  
C.-A. Aledo ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Mushy Zone ◽  
Volume Average

scholarly journals Bounding the Output Error in a Buck Power Converter Using Perturbation Theory

2008 ◽  
Vol 2008 ◽  
pp. 1-20 ◽  
Author(s):  
Fabiola Angulo ◽  
Enric Fossas ◽  
Tere M. Seara ◽  
Gerard Olivar
Keyword(s):  
Perturbation Theory ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Dynamic Control ◽  
Power Converter ◽  
Control Technique ◽  
Order System ◽  
Sliding Surface ◽  
Output Error ◽  
Average Theory

We show the main results obtained when applying the average theory to Zero Average Dynamic control technique in a buck power converter with pulse-width modulation (PWM). In particular, we have obtained the bound values for output error and sliding surface. The PWM with centered and lateral pulse configurations were analyzed. The analytical results have confirmed the numerical and experimental results already obtained in previous publications. Moreover, through an important lemma, we have generalized the theory for any stable second-order system with relative degree 2, using properties related to transformations and stability of linear systems.

Sign in / Sign up

Export Citation Format

Share Document