The Experts below are selected from a list of 18816 Experts worldwide ranked by ideXlab platform
Timothy N. Hunter - One of the best experts on this subject based on the ideXlab platform.
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extending estimation of the critical deposition velocity in solid liquid pipe flow to ideal and non ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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Extending estimation of the critical deposition velocity in solid–liquid pipe flow to ideal and non-ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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constraints on the functional form of the critical deposition velocity in solid liquid pipe flow at low solid volume fractions
Chemical Engineering Science, 2015Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. Hunter, Bashar Mahmoud, Simon BiggsAbstract:Of the various transition velocities that delineate flow regimes in multiphase pneumatic and hydraulic conveying, the critical deposition velocity is important because it separates depositing and non-depositing flows. However, no distinction has been made between the dependence of the critical deposition velocity on physical parameters and flow conditions at low solid volume fractions and in the limit of zero volume fraction, which are distinct mathematically. Here, the two cases are analysed separately, and a general functional form in terms of the Particle Reynolds Number and Archimedes Number is proposed that is valid up to volume fractions of several per cent. An ultrasonic method for determining the critical value of the Particle Reynolds Number is presented, and results for four Particle types at several nominal volume fractions (0.5, 1 and 3% by volume) are combined with a Number of data from the literature. The resulting expressions are found to compare well with several similar correlations for the critical deposition velocity and other transition velocities, and, unlike a recent best-fit approach for the pick-up velocity, incorporate an explicit dependence on volume fraction, to which the critical deposition velocity is most sensitive at very low volume fractions. Lastly, it is found that the functional forms for the critical deposition velocity in the literature are unable to reproduce the available data at higher volume fractions, and a Number of suggestions are made for resolving this issue.
Hugh P. Rice - One of the best experts on this subject based on the ideXlab platform.
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extending estimation of the critical deposition velocity in solid liquid pipe flow to ideal and non ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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Extending estimation of the critical deposition velocity in solid–liquid pipe flow to ideal and non-ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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constraints on the functional form of the critical deposition velocity in solid liquid pipe flow at low solid volume fractions
Chemical Engineering Science, 2015Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. Hunter, Bashar Mahmoud, Simon BiggsAbstract:Of the various transition velocities that delineate flow regimes in multiphase pneumatic and hydraulic conveying, the critical deposition velocity is important because it separates depositing and non-depositing flows. However, no distinction has been made between the dependence of the critical deposition velocity on physical parameters and flow conditions at low solid volume fractions and in the limit of zero volume fraction, which are distinct mathematically. Here, the two cases are analysed separately, and a general functional form in terms of the Particle Reynolds Number and Archimedes Number is proposed that is valid up to volume fractions of several per cent. An ultrasonic method for determining the critical value of the Particle Reynolds Number is presented, and results for four Particle types at several nominal volume fractions (0.5, 1 and 3% by volume) are combined with a Number of data from the literature. The resulting expressions are found to compare well with several similar correlations for the critical deposition velocity and other transition velocities, and, unlike a recent best-fit approach for the pick-up velocity, incorporate an explicit dependence on volume fraction, to which the critical deposition velocity is most sensitive at very low volume fractions. Lastly, it is found that the functional forms for the critical deposition velocity in the literature are unable to reproduce the available data at higher volume fractions, and a Number of suggestions are made for resolving this issue.
Jeff Peakall - One of the best experts on this subject based on the ideXlab platform.
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extending estimation of the critical deposition velocity in solid liquid pipe flow to ideal and non ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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Extending estimation of the critical deposition velocity in solid–liquid pipe flow to ideal and non-ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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constraints on the functional form of the critical deposition velocity in solid liquid pipe flow at low solid volume fractions
Chemical Engineering Science, 2015Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. Hunter, Bashar Mahmoud, Simon BiggsAbstract:Of the various transition velocities that delineate flow regimes in multiphase pneumatic and hydraulic conveying, the critical deposition velocity is important because it separates depositing and non-depositing flows. However, no distinction has been made between the dependence of the critical deposition velocity on physical parameters and flow conditions at low solid volume fractions and in the limit of zero volume fraction, which are distinct mathematically. Here, the two cases are analysed separately, and a general functional form in terms of the Particle Reynolds Number and Archimedes Number is proposed that is valid up to volume fractions of several per cent. An ultrasonic method for determining the critical value of the Particle Reynolds Number is presented, and results for four Particle types at several nominal volume fractions (0.5, 1 and 3% by volume) are combined with a Number of data from the literature. The resulting expressions are found to compare well with several similar correlations for the critical deposition velocity and other transition velocities, and, unlike a recent best-fit approach for the pick-up velocity, incorporate an explicit dependence on volume fraction, to which the critical deposition velocity is most sensitive at very low volume fractions. Lastly, it is found that the functional forms for the critical deposition velocity in the literature are unable to reproduce the available data at higher volume fractions, and a Number of suggestions are made for resolving this issue.
Michael Fairweather - One of the best experts on this subject based on the ideXlab platform.
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extending estimation of the critical deposition velocity in solid liquid pipe flow to ideal and non ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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Extending estimation of the critical deposition velocity in solid–liquid pipe flow to ideal and non-ideal Particles at low and intermediate solid volume fractions
Chemical Engineering Science, 2020Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. HunterAbstract:Abstract The critical deposition velocity in horizontal pipe flow of liquid-solid slurries separates bed-forming and fully suspended flows. A compilation of critical deposition velocity data is presented using new experimental data (for Particles ranging from 9 to 690 µm in diameter) along with data from the literature, and a close correlation between the Particle Reynolds Number and the Archimedes Number (which describe the properties of the flow and the liquid and solid phases) is found. The role of solid Particle packing is discussed and suggestions are made for the incorporation of solid-phase material properties – specifically Particle shape and angularity, and surface forces – into an empirical parameter, the volume factor, α, to account for the deviation of Particle behaviour from ideal, non-interacting, hard-sphere behaviour.
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constraints on the functional form of the critical deposition velocity in solid liquid pipe flow at low solid volume fractions
Chemical Engineering Science, 2015Co-Authors: Hugh P. Rice, Jeff Peakall, Michael Fairweather, Timothy N. Hunter, Bashar Mahmoud, Simon BiggsAbstract:Of the various transition velocities that delineate flow regimes in multiphase pneumatic and hydraulic conveying, the critical deposition velocity is important because it separates depositing and non-depositing flows. However, no distinction has been made between the dependence of the critical deposition velocity on physical parameters and flow conditions at low solid volume fractions and in the limit of zero volume fraction, which are distinct mathematically. Here, the two cases are analysed separately, and a general functional form in terms of the Particle Reynolds Number and Archimedes Number is proposed that is valid up to volume fractions of several per cent. An ultrasonic method for determining the critical value of the Particle Reynolds Number is presented, and results for four Particle types at several nominal volume fractions (0.5, 1 and 3% by volume) are combined with a Number of data from the literature. The resulting expressions are found to compare well with several similar correlations for the critical deposition velocity and other transition velocities, and, unlike a recent best-fit approach for the pick-up velocity, incorporate an explicit dependence on volume fraction, to which the critical deposition velocity is most sensitive at very low volume fractions. Lastly, it is found that the functional forms for the critical deposition velocity in the literature are unable to reproduce the available data at higher volume fractions, and a Number of suggestions are made for resolving this issue.
Zhuo Wang - One of the best experts on this subject based on the ideXlab platform.
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an improved direct forcing immersed boundary method with inward retraction of lagrangian points for simulation of Particle laden flows
Journal of Computational Physics, 2019Co-Authors: Zhuo WangAbstract:Abstract The direct-forcing immersed boundary is widely adopted to study Particle-laden flows. The effective hydrodynamic diameter of the Particle is much or less overestimated by the original immersed boundary method, depending on the Particle Reynolds Number and grid resolution. In this paper, we propose an improved method to dynamically correct the effective hydrodynamic diameter by retracting inward the Lagrangian points to varying distances. The retraction distance is determined by querying a function fitted in this paper. The improved method is tested and validated by several cases, including falling of a spherical Particle under gravity, the uniform flow past two stationary Particles and the drafting-kissing-tumbling phenomenon of two settling Particles. It turns out the improved method not only provides better results for the drag force but also predicts the flow field more accurately. What's more, due to the insensitivity to grid resolution, the improved method is suitable for simulating large-scale fluid–Particle systems such as fluidized bed, which are computationally expensive.