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Showing 1 to 20 of 42 for “"Permeance"”.
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Permeance based modelling, design and optimization of supercapacitor assisted surge absorber (SCASA)
… under both 50 Hz AC and transient conditions, a permeance based model is used. Our model highlights non-ideal characteristics of the coupled-inductor such as leakage and magnetizing inductances, and provides theoretical predictions based on the permeance coefficients extracted from manufacturer …
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Designing a Membrane Module for Determining the Permeance of High Fluxing Membranes and the Testing RTIL-Membranes for Dehumidification.
… we need to determine: the upper limit on SILM permeance free of gas boundary resistances, the upper limit on water/gas selectivity. Thus, we suggest designed several new membrane modules, and the testing RTIL-membranes, with water miscible and water immiscible SILMs, for dehumidification.
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Reverse-Selective Behavior Of The Room Temperature Ionic Liquid Based Membranes
… It explored reverse-selectivity by measuring the permeance of carbon dioxide, nitrogen, methane, propylene, propane, 1-butene, and butane in supported ionic liquid membranes (SILM). Particular attention was given to the reverse-selective behavior in the propane/methane and propane/nitrogen …
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Novel inorganic membranes for gas separation
… ionic liquid membranes (SILMs) displayed CO₂ permeance of 1x10⁻⁹ to 3x10⁻⁸ mol m⁻² s⁻¹ Pa⁻¹ and CO₂/CH₄ selectivity of up to 50 which is comparable with the current polymeric separation systems. It is concluded that, although the RTIL membranes showed good CO₂/CH₄ selectivity, the CO₂ …
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Gas Separation Using Nanoporous Single-Layer Graphene Membranes
… nanoscale pores, it can exhibit both a high gas permeance and a high selectivity, which is beneficial for reducing the cost of gas separation processes. However, significant challenges remain for matching theoretical predictions with experimental measurements and for the real application of …
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Simulation study of carbon dioxide and methane permeation in hybrid inorganic-organic membrane
… level using a diffusion mechanism. The predicted permeances and relative selectivity of CO₂ and CH₄ are compared with the experimental results. In the MD simulation a single-pore silica crystal framework model with and without inserted phenyl groups are used to define two membrane structures. We …
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Water selective MFI zeolite membranes for application in the Fischer Tropsch Synthesis
… will result in increased water selectivity and permeance. It is also hypothesised that the separation process can be modelled using the MaxwellStefan (MS) formulation. MFI zeolite membranes were synthesised on a-alumina supports, of varying Si/ Al ratio. Two synthesis techniques were used: viz. …
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Development of macroscopic nanoporous graphene membranes for gas separation
… membranes have the potential to exceed the permeance and selectivity limits of existing gas separation membranes. This is made possible by the atomic thickness of the material, which can support sub-nanometer pores that enable molecular sieving while presenting low resistance to permeate …
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Modelling and analysis of asynchronous and synchronous torques in split-phase induction machines
… effects. Using this model, winding harmonics and permeance harmonics may be calculated independently of each other so that the model can be used to analyse asynchronous torques from winding harmonics as well as synchronous torques from permeance harmonics. These are calculated separately. The …
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Room Temperature Ionic Liquid (Rtil) Membranes For Bio-Methane Dehumidification
… [TfO] anion had a water permeance of 2000 GPUs with a H2O/CH 4 selectivity of 16000. The bulk of the RTILs exhibited similar water permeances ranging from ∼700-900 GPU. The methane permeances ranged from 0.15 GPU–0.5 GPU with [emim][TfO] having the lowest average CH …
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Design and Modeling of Nanostructured Palladium-Based Hydrogen-Selective Membranes
… Pd-based membranes, recognized for high permeance and selectivity, offer a promising solution for this separation with minimal energy, cost, and footprint. However, these membranes have not yet been tailored for nuclear fusion applications. There are no comprehensive models explaining the …
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Induction Machine Performance Improvements: Design-Oriented Approaches
… an induction machine model featuring a variable permeance element mesh is introduced. Results for a 500 W motor are compared to measurements, analytical models, and FEA. This machine has limited nominal torque capabilities due to saturated stator and rotor teeth, discovered neither by the design …
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Ion transport across individual sub-continuum graphene nanopores : phenomenology, theory, and implications for industrial separations
… places it in a new physical regime with ultimate permeance and distinct geometric constraints on atomic interactions. Engineering graphene nanopores with both high permeance and selectivity has major implications for industrial separation processes, including reverse osmosis, nanofiltration, …
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Molecular Separation and Power Generation by Carbon Nanomembranes
… CNMs were intrinsically microporous. While the permeance of helium remains almost the same for 6.5 and 3.0 nm thick CNMs, the water permeance increases by two orders of magnitude. The permeance of saturated water vapor decreased from more than 10–4 mol·m–2·s–1·Pa–1 at 3.0 nm to …
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Synthesis and characterization of thermally stable palladium-based composite membranes for high temperature applications
… lower the leak growth rate, though the hydrogen permeance stability was not improved. The Pd-Pt alloy membrane, despite having a lower hydrogen permeance, had a stable hydrogen flux at higher temperatures. The influence of high temperature annealing (> 640 ºC) on the thermal stability of pure Pd …
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Nanoporous monolayer graphene membranes for water purification : from concept to realization
… graphene have the potential for ultra-fast water permeance and high solute rejection as the atomic thinness provides little resistance to flow yet sterically hinders the transport of solutes larger than the pores. The resulting two-dimensional, nanoporous membrane is predicted to exhibit …
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Studies of the Ethanol Steam Reforming Reaction in a Membrane Reactor
… ESR reaction. Studies of the effect of hydrogen permeance on the ESR reaction at 623 K were performed in MRs equipped with silica-based and palladium-based membranes of different hydrogen permeances, and the highest ethanol conversion enhancement of 44 % and hydrogen molar flow enhancement of 69 …
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Hyperbranched And Polydimethylsiloxane Based Membranes For CO2 Capture
… film membranes. In addition to examining the permeance of each type, the study explored various membrane formation techniques and how that affects the permeability of specific membrane types.</p> <p>The results showed that solvent selection and polymer/solvent contact angle has the greatest …
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Experimental and modeling studies on a catalytic packed bed membrane reactor
… to characterize it in terms of its flux, permeance, and selectivity of H2 over CO. Experiments were carried out in the packed bed membrane reactor to study the effects of these conditions on the conversion. A mathematical model was developed for the reactor. Experiments with similar …
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Selection and optimization of the seeding procedure prior to the synthesis of Pd-based membranes
… was determined by subjecting the membranes to permeance tests with N2 at both high and low temperatures as well as with H2 at high temperatures.
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