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Sharad Kumar Gupta - One of the best experts on this subject based on the ideXlab platform.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
N Goyal - One of the best experts on this subject based on the ideXlab platform.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
Shishir Suman - One of the best experts on this subject based on the ideXlab platform.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
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mathematical modeling of co2 separation from gaseous mixture using a hollow fiber membrane module physical Mechanism and influence of partial Wetting
Journal of Membrane Science, 2015Co-Authors: N Goyal, Shishir Suman, Sharad Kumar GuptaAbstract:The present study describes a steady-state phenomenological model for CO2 separation via reactive absorption into aqueous Diethanolamine (DEA) solution using a micro-porous Poly-propylene (PP) Hollow-Fiber Membrane Module (HFMM). The developed model is based on the fundamental Mechanisms of molecular diffusion, bulk convection and liquid-phase chemical reaction, and simultaneously accounts for the consequences of ‘partial-Wetting’ phenomenon. Furthermore, a physically-consistent Wetting Mechanism has been formulated assuming that the membrane pores may be modeled as a bundle of straight cylindrical capillaries with distinct radii (characterized by the membrane pore-size distribution) and equal lengths, while keeping in mind the various pore-scale micro-physical phenomena. Under the simplifying parameterizations of the Finite-Volume Method (FVM), the source-code for discretized equations was compiled and implemented using C++ Language for a co-current module operation with aqueous DEA solution flowing inside the fiber-lumen and CO2–N2 gaseous mixture passing through the shell-side. A Benchmarking Analysis revealed an excellent agreement between the model predictions and the experimental data reported in open-literature, thereby validating the current model formulation, and rendering it fundamentally relevant with respect to the Wetting-phenomenon. In addition, the module performance in terms of CO2 flux, Overall Mass-Transfer Coefficient (MTC), and Removal-Efficiency, has been systematically analyzed pertaining to the physical influence of other operating variables such as absorbent concentration, hydrodynamics, pressure, temperature, and membrane characteristics. From a modeling standpoint, it may be concluded that the present model successfully captures various observations vis-a-vis the process of CO2 separation using micro-porous HFMMs, reported previously in the literature. Moreover, for a given gas-phase hydrodynamics, the current set of results suggest the existence of a unique liquid-phase hydrodynamic regime, bounded by a minimum and a maximum permissible pressure, under which the module can be effectively operated without any dispersive losses. Besides, the currently developed model has been demonstrated to explain the reduction in CO2 flux over time by allowing for morphological changes, including an enlargement in the average pore-size and a broadening of the pore-size distribution.
Carso J Meredith - One of the best experts on this subject based on the ideXlab platform.
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pollenkitt Wetting Mechanism enables species specific tunable pollen adhesion
Langmuir, 2013Co-Authors: Ismael J Gomez, Carso J MeredithAbstract:: Plant pollens are microscopic particles exhibiting a remarkable breadth of complex solid surface features. In addition, many pollen grains are coated with a viscous liquid, "pollenkitt", thought to play important roles in pollen dispersion and adhesion. However, there exist no quantitative studies of the effects of solid surface features or pollenkitt on adhesion of pollen grains, and it remains unclear what role these features play in pollen adhesion and transport. We report AFM adhesion measurements of five pollen species with a series of test surfaces in which each pollen has a unique solid surface morphology and pollenkitt volume. The results indicate that the combination of surface morphology (size and shape of echinate or reticulate features) with the pollenkitt volume provides pollens with a remarkably tunable adhesion to surfaces. With pollenkitt removed, pollen grains had relatively low adhesion strengths that were independent of surface chemistry and scalable with the tip radius of the pollen's ornamentation features, according to the Hamaker model. With the pollenkitt intact, adhesion was up to 3-6 times higher than the dry grains and exhibited strong substrate dependence. The adhesion enhancing effect of pollenkitt was driven by the formation of pollenkitt capillary bridges and was surprisingly species-dependent, with echinate insect-pollinated species (dandelion and sunflower) showing significantly stronger adhesion and higher substrate dependence than wind-pollinated species (ragweed, poplar, and olive). The combination of high pollenkitt volume and large convex, spiny surface features in echinate entomophilous varieties appears to enhance the spreading area of the liquid pollenkitt relative to varieties of pollen with less pollenkitt volume and less pronounced surface features. Measurements of pollenkitt surface energy indicate that the adhesive strength of capillary bridges is primarily dependent on nonpolar van der Waals interactions, with some contribution from the Lewis basic component of surface energy.
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pollenkitt Wetting Mechanism enables species specific tunable pollen adhesion
Langmuir, 2013Co-Authors: Haisheng Lin, Ismael J Gomez, Carso J MeredithAbstract:Plant pollens are microscopic particles exhibiting a remarkable breadth of complex solid surface features. In addition, many pollen grains are coated with a viscous liquid, “pollenkitt”, thought to...
L Yu - One of the best experts on this subject based on the ideXlab platform.
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Wetting Mechanism of alkyl ketene dimers on cellulose films
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1998Co-Authors: Gil Garnier, Lyse Godbout, J Wright, L YuAbstract:Abstract The Wetting Mechanism of a commercial Alkyl ketene dimers (AKD) wax on smooth cellulose films was investigated by following the contact angle of sessile drops for differing periods of time ranging from 1 s to 24 h. The advancing and receding contact angles formed by droplets of AKD melt and water over other model surfaces such as glass, cellulose acetate films and against air AKD-grafted surfaces were also measured. The objectives of the study were to elucidate whether or not AKD melt can spontaneously spread on cellulose, and to identify the Mechanism and driving forces responsible for the dynamic Wetting behavior. When an AKD droplet is deposited on a cellulose surface, the contact angle at the three-phase line follows two sequential kinetics. In the first, the contact angle rapidly decreases to an apparent equilibrium contact angle (θAE). In the second, θAE slowly decreases over periods of hours. The first Mechanism is dictated by the balance of the interfacial forces with the viscous forces. The second is caused by an equilibrium shift driven by the hydrolysis of AKD vapor molecules physisorbed on the cellulose film. AKD spreading on cellulose was never observed. Similar AKD Wetting was observed on cellulose acetate and glass. A certain surface specificity exists as its chemical composition determines the amount and the ratio of chemisorption/physisorption of AKD vapor present on the surface. The non-spreadability of AKD on cellulose raises serious doubts about the generally assumed Mechanism of internal paper sizing. AKD Wetting during papermaking is also analyzed.
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Wetting Mechanism of alkyl ketene dimers on cellulose films
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1998Co-Authors: Gil Garnier, Lyse Godbout, J Wright, L YuAbstract:Abstract The Wetting Mechanism of a commercial Alkyl ketene dimers (AKD) wax on smooth cellulose films was investigated by following the contact angle of sessile drops for differing periods of time ranging from 1 s to 24 h. The advancing and receding contact angles formed by droplets of AKD melt and water over other model surfaces such as glass, cellulose acetate films and against air AKD-grafted surfaces were also measured. The objectives of the study were to elucidate whether or not AKD melt can spontaneously spread on cellulose, and to identify the Mechanism and driving forces responsible for the dynamic Wetting behavior. When an AKD droplet is deposited on a cellulose surface, the contact angle at the three-phase line follows two sequential kinetics. In the first, the contact angle rapidly decreases to an apparent equilibrium contact angle (θAE). In the second, θAE slowly decreases over periods of hours. The first Mechanism is dictated by the balance of the interfacial forces with the viscous forces. The second is caused by an equilibrium shift driven by the hydrolysis of AKD vapor molecules physisorbed on the cellulose film. AKD spreading on cellulose was never observed. Similar AKD Wetting was observed on cellulose acetate and glass. A certain surface specificity exists as its chemical composition determines the amount and the ratio of chemisorption/physisorption of AKD vapor present on the surface. The non-spreadability of AKD on cellulose raises serious doubts about the generally assumed Mechanism of internal paper sizing. AKD Wetting during papermaking is also analyzed.
