The Experts below are selected from a list of 19476 Experts worldwide ranked by ideXlab platform
Jozef L Kokini - One of the best experts on this subject based on the ideXlab platform.
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effect of mixer geometry and operating conditions on Mixing efficiency of a non newtonian fluid in a twin screw mixer
Journal of Food Engineering, 2013Co-Authors: Maureen L Rathod, Jozef L KokiniAbstract:Abstract The effect of mixer speed, fluid inflow rate, and paddle angle was examined in a shortened geometry. 3D FEM simulation of non-Newtonian 2 g/100 mL carboxymethyl cellulose aqueous solution in the Mixing region of a Readco continuous mixer was performed. Data gathered included velocity vectors, shear rate, and Mixing Index. Increasing mixer speed increased velocity magnitudes in the horizontal and vertical directions. Fluid inflow rate had little impact on velocity in the horizontal and vertical directions, but increased velocity in the axial direction and elongational contribution to the Mixing Index. All configurations showed areas of simple shear flow where the fluid experienced high shear rates. Staggering paddles increased the maximum axial velocity and shear rate. When successive paddles on the same screw are parallel, a zone was seen between the center of the paddle and the barrel wall which demonstrated efficient dispersive Mixing.
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examination of the Mixing ability of single and twin screw mixers using 2d finite element method simulation with particle tracking
Journal of Food Engineering, 2007Co-Authors: Robin K Connelly, Jozef L KokiniAbstract:The Mixing in model 2D single screw and co-rotating twin screw dough mixers is evaluated using the commercial CFD package Polyflow with a Carreau flow model for dough to generate velocity profiles and particle trajectories. The mixed Galerkin FEM simulations use a rotating reference frame technique with the single paddle mixer and a mesh superposition technique in the twin paddle mixer. Differences in the velocity profiles are noted. Distributive Mixing is evaluated visually as well as using the segregation scale and cluster distribution Index; stretching is evaluated using the length of stretch and Mixing efficiency; and dispersive Mixing is evaluated using the Mixing Index in combination with the shear stress. Since material points stay on their streamlines in the 2D single screw mixer, the 2D twin screw mixer is found to be generally more effective and efficient, although there are still areas of poor Mixing.
I M Louis - One of the best experts on this subject based on the ideXlab platform.
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a robust respiratory phase identification scheme based on a new Mixing Index
European Signal Processing Conference, 2009Co-Authors: F Jin, F Sattar, Dyt Goh, I M LouisAbstract:This paper introduces a novel method to identify inspiratory and expiratory phases from single channel tracheal breath sound (TBS) of different types, by proposing a new annotating Index name as “Mixing Index” (MI). An alignment scheme based on phase shift difference information has been firstly introduced to align the consecutive respiratory phase segments. MI is then proposed based on similarity measurements to annotate the respective inspiration/expiration in each aligned respiratory phase segment pair. By incorporating the novel alignment scheme, the presented Index overcomes the problem of phase cancellation which affects the cross-coherence of the input segment pairs. As MI is invariant to spectral content and amplitude dynamics, the proposed method maintains a good performance even in the presence of adventitious sounds. A high averaged accuracy of 97.4% for adventitious sounds and 100% for normal TBS have been thereby achieved. The proposed method has been a successful attempt to solve the clinical application challenge faced by the existing phase identification methods in terms of respiratory dysfunctions.
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EUSIPCO - A robust respiratory phase identification scheme based on a new Mixing Index
2009Co-Authors: F Jin, F Sattar, Dyt Goh, I M LouisAbstract:This paper introduces a novel method to identify inspiratory and expiratory phases from single channel tracheal breath sound (TBS) of different types, by proposing a new annotating Index name as “Mixing Index” (MI). An alignment scheme based on phase shift difference information has been firstly introduced to align the consecutive respiratory phase segments. MI is then proposed based on similarity measurements to annotate the respective inspiration/expiration in each aligned respiratory phase segment pair. By incorporating the novel alignment scheme, the presented Index overcomes the problem of phase cancellation which affects the cross-coherence of the input segment pairs. As MI is invariant to spectral content and amplitude dynamics, the proposed method maintains a good performance even in the presence of adventitious sounds. A high averaged accuracy of 97.4% for adventitious sounds and 100% for normal TBS have been thereby achieved. The proposed method has been a successful attempt to solve the clinical application challenge faced by the existing phase identification methods in terms of respiratory dysfunctions.
Jam Hans Kuipers - One of the best experts on this subject based on the ideXlab platform.
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longitudinal and transverse Mixing in rotary kilns a discrete element method approach
Chemical Engineering Science, 2005Co-Authors: G J Finnie, Nicolaas P Kruyt, C Zeilstra, Jam Hans KuipersAbstract:Longitudinal and transverse Mixing in horizontal rotary kilns has been studied, using a three-dimensional Discrete Element Method approach. The focus is on the effect of the main operating conditions, i.e., the filling degree and the rotational speed of the rotary kiln, on quantitative measures of longitudinal and transverse Mixing. Discrete Element Method simulations have been performed for various values of the main operating conditions. Flow regimes have been determined from visualisations of the simulations. It is shown that the Mixing in the longitudinal direction can be described by a diffusion equation. The dependence of the diffusion coefficient on the operating conditions has been determined from the results of the simulations. It is found that the diffusion coefficient increases linearly with rotational speed, while the influence of the filling degree is relatively small. The Mixing in the transverse plane is quantified by an entropy-like Mixing Index. The results of the simulations show that this Mixing Index varies exponentially with the number of revolutions of the rotary kiln. The dependence on the operating conditions of the transverse Mixing speed, as determined from the exponential behaviour of the Mixing Index, has been determined. This Mixing speed decreases with increasing rotational speed and with increasing filling degree. The transverse Mixing speed that has been determined from the results of additional two-dimensional simulations is generally larger than that observed in the corresponding three-dimensional simulations.
R David - One of the best experts on this subject based on the ideXlab platform.
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Characterization of Mixing in a stirred tank by planar laser induced fluorescence (PLIF)
Chemical Engineering Research and Design, 2001Co-Authors: A Fall, Olivier Lecoq, R DavidAbstract:The Mixing of two water feedstreams is investigated in a 0.02 m(3) continuous stirred tank, from concentration measurements. These measurements are carried out with a laser sheet in a very thin vertical plane through the vessel tangent to the impeller. The proportionality between the grey level obtained by planar laser induced fluorescence and the local concentration has been previously determined. The fields of instantaneous concentration, temporal variance and Mixing Index are processed from the grey level images.
G K Roy - One of the best experts on this subject based on the ideXlab platform.
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comparison of Mixing Index for binary and ternary mixtures of irregular particles in a gas solid fluidized bed
Canadian Journal of Chemical Engineering, 2011Co-Authors: Abanti Sahoo, Rahul Garg, G K RoyAbstract:Ternary mixtures of equi-density particles have been fluidized in a gas–solid fluidized bed to study the Mixing characteristics. A correlation for the Mixing Index has been developed for these mixtures. The Mixing Index for the ternary mixtures has also been calculated by the already available method. Finally a comparison has been made for the values of the Mixing Index calculated by both the methods against the experimental ones. The values of the Mixing Index for the ternary mixtures thus obtained have also been compared with those of the binary mixtures thereby indicating its application for real life multi-component Mixing over a wide range of parameters. Des melanges ternaires de particules d'equi-densite ont ete fluidises sur un lit fluidise gaz-solide pour etudier les caracteristiques de melange. Une correlation pour l'indice de melange a ete developpee pour ces melanges. L'indice de melange pour les melanges ternaires a egalement ete calcule par la methode deja disponible. Finalement, une comparaison a ete faite pour les valeurs de l'indice de melange calculees par les deux methodes, par rapport aux valeurs experimentales. Les valeurs de l'indice de melange pour les melanges ternaires ainsi obtenues ont aussi ete comparees a celles des melanges binaires, indiquant ainsi l'application possible pour des melanges de composants multiples de la vie reelle et pour une grande diversite de parametres.
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Comparison of Mixing Index for binary and ternary mixtures of irregular particles in a gas–solid fluidized bed
The Canadian Journal of Chemical Engineering, 2011Co-Authors: Abanti Sahoo, Rahul Garg, G K RoyAbstract:Ternary mixtures of equi-density particles have been fluidized in a gas–solid fluidized bed to study the Mixing characteristics. A correlation for the Mixing Index has been developed for these mixtures. The Mixing Index for the ternary mixtures has also been calculated by the already available method. Finally a comparison has been made for the values of the Mixing Index calculated by both the methods against the experimental ones. The values of the Mixing Index for the ternary mixtures thus obtained have also been compared with those of the binary mixtures thereby indicating its application for real life multi-component Mixing over a wide range of parameters. Des melanges ternaires de particules d'equi-densite ont ete fluidises sur un lit fluidise gaz-solide pour etudier les caracteristiques de melange. Une correlation pour l'indice de melange a ete developpee pour ces melanges. L'indice de melange pour les melanges ternaires a egalement ete calcule par la methode deja disponible. Finalement, une comparaison a ete faite pour les valeurs de l'indice de melange calculees par les deux methodes, par rapport aux valeurs experimentales. Les valeurs de l'indice de melange pour les melanges ternaires ainsi obtenues ont aussi ete comparees a celles des melanges binaires, indiquant ainsi l'application possible pour des melanges de composants multiples de la vie reelle et pour une grande diversite de parametres.
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Effect of promoters and secondary fluidizing medium on Mixing: statistical and ANN approaches
Asia-Pacific Journal of Chemical Engineering, 2008Co-Authors: Y.k. Mohanty, B.p. Mohanty, G K Roy, K.c. BiswalAbstract:Factorial design (statistical approach) and artificial neural network (ANN) models have been developed for the prediction of Mixing the Index with four system parameters, such as static bed heights, average particle densities, average particle sizes and gas velocities, under four different experimental conditions, viz., only primary air, simultaneous primary and secondary air, disc promoter and rod promoter. The values of the Mixing Index obtained through the developed models are found to agree well with their experimental counterparts. It has also been found from these investigations that under simultaneous primary and secondary air supply conditions the best Mixing performance is achieved, i.e. IM ≈ 1.0, as compared to rod promoter, disc promoter, and only primary air supply. 2008 Curtin University of Technology and John Wiley & Sons, Ltd.
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Mixing characteristics of binary mixtures using promoters and secondary fluidizing medium
Powder Technology, 2008Co-Authors: Y.k. Mohanty, K.c. Biswal, G K RoyAbstract:Abstract In the present investigation, a new technique for augmenting Mixing of particles, expressed through the Mixing Index (IM), has been found. Correlations for the Mixing Index have been developed with system parameters such as static bed heights, average particle densities, average particle sizes and gas mass velocities under four different experimental conditions, viz., only primary air, simultaneous primary and secondary air, disc promoter and rod promoter using the factorial design approach. The values of the Mixing Index obtained through the developed model are found to agree well with their experimental counterparts. Furthermore, it has been observed that the best Mixing performance is achieved (IM ≈ 1) under conditions of simultaneous primary and secondary air supply.
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Mixing Characteristic of Homogeneous Binary Mixture of Regular Particles in a Gas-Solid Fluidized Bed
Powder Technology, 2005Co-Authors: Abanti Sahoo, G K RoyAbstract:The Mixing characteristic of large particles (Geldart BD type) has been investigated in a cylindrical gas–solid fluidized bed. Based on dimensional analysis, a correlation for the Mixing Index has been developed with the system parameters viz., average particle size of the mixture, initial static bed height, height of the particles' layer in the bed (from where the sample is drawn) and superficial velocity of the fluidizing medium. A theoretical model for the Mixing Index has been developed based on the counter flow of solids with circulation and horizontal dispersion. A comparison has been made for the values of the Mixing Index calculated by both the theoretical and the experimental models.