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Artykuły w czasopismach na temat „Plug Flow Modelling”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Aguguo, Johnbosco, and Matthew Clarke. "On the Necessity of Including the Dissociation Kinetics When Modelling Gas Hydrate Pipeline Plug Dissociation." Energies 17, no. 12 (2024): 3036. http://dx.doi.org/10.3390/en17123036.

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Gas hydrate plugs in petroleum fluid pipelines are a major flow assurance problem and thus, it is important for industry to have reliable mathematical models for estimating the time required to dissociate a hydrate pipeline plug. The existing mathematical models for modelling hydrate plug dissociation treat the problem as a pure heat transfer problem. However, an early study by Jamaluddin et al. speculated that the kinetics of gas hydrate dissociation could become the rate-limiting factor under certain operating conditions. In this short communication, a rigorous 2D model couples the equations

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2

Juanico, Marcelo. "Should Waste Stabilization Ponds be Designed for Perfect-Mixing or Plug-Flow?" Water Science and Technology 23, no. 7-9 (1991): 1495–502. http://dx.doi.org/10.2166/wst.1991.0602.

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The effect of the hydraulic flow pattern on the performance of Waste Stabilization Ponds is analyzed by modelling. The analysis is made on two parameters with different removal constants (Bacteria and BOD) and for the cases of steady hydraulic loading and when hydraulic loading changes on weekends. Plug-flow ponds perform much better than perfect mixed ones for removal of parameters with high removal constants such as bacteria. Plug-flow and perfect mixed ponds perform very similarly when the removal constant is low as for BOD. Changes in the hydraulic loading regime due to weekend effect do n

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3

Ivanov, E. A., A. S. Klyuyev, A. A. Zharkovskii, and I. O. Borshchev. "Numerical Simulation of Multiphase Flow Structures in Openfoam Software Package." E3S Web of Conferences 320 (2021): 04016. http://dx.doi.org/10.1051/e3sconf/202132004016.

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Numerical simulation of various structures of multiphase flow in the pipe was performed using the OpenFOAM software package. A visual comparison of multiphase flow design structures for separated stratified-wave, plug and annular flow modes with experimental data is presented. For multiphase flow modelling the solver compressibleInterFoam was used. From the results of numerical modelling, it follows that the OpenFOAM software package allows correct prediction of multiphase flow modes in the pipe depending on Reynolds numbers for gas and liquid phases of the flow.

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4

Wodołażski, Artur, and Adam Smoliński. "Bio-Hydrogen Production in Packed Bed Continuous Plug Flow Reactor—CFD-Multiphase Modelling." Processes 10, no. 10 (2022): 1907. http://dx.doi.org/10.3390/pr10101907.

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This research study investigates the modelling and simulation of biomass anaerobic dark fermentation in bio-hydrogen production in a continuous plug flow reactor. A CFD multiphase full transient model in long-term horizons was adopted to model dark fermentation biohydrogen production in continuous mode. Both the continuous discharge of biomass, which prevents the accumulation of solid parts, and the recirculation of the liquid phase ensure constant access to the nutrient solution. The effect of the hydraulic retention time (HRT), pH and the feed rate on the bio-hydrogen yield and production ra

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5

Johannsen, Ib, Björn Kilsgaard, Viktor Milkevych, and Dale Moore. "Design, Modelling, and Experimental Validation of a Scalable Continuous-Flow Hydrothermal Liquefaction Pilot Plant." Processes 9, no. 2 (2021): 234. http://dx.doi.org/10.3390/pr9020234.

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In this study, the design and practical implementation of a novel, scalable plug-flow pilot plant for hydrothermal liquefaction of organic feedstock is presented. The overall discussion comprises the system’s design, process modelling, and simulation, as well as results for an experimental validation of the proposed design with a focus on fluid dynamics and heat transfer. The design criteria take into account the scalability of the plug-flow processing system, optimized non-isothermal flow conditions of highly viscous liquids in a tubular system at harsh process conditions, specifically high p

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6

Ramandi, Hamed Lamei, Peyman Mostaghimi, Ryan T. Armstrong, et al. "Pore scale imaging and modelling of coal properties." APPEA Journal 55, no. 2 (2015): 468. http://dx.doi.org/10.1071/aj14103.

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A key parameter in determining the productivity and commercial success of coal seam gas wells is the permeability of individual seams. Laboratory testing of core plugs is commonly used as an indicator of potential seam permeability. The highly heterogeneous and stress-dependent nature of coal makes laboratory measurements difficult to perform and the results difficult to interpret. Consequently, permeability in coal is poorly understood. The permeability of coal at the core scale depends on the geometry, topology, connectivity, mineralisation and spatial distribution of the cleat system, and a

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7

Yeung, Hoi. "Modelling of service reservoirs." Journal of Hydroinformatics 3, no. 3 (2001): 165–72. http://dx.doi.org/10.2166/hydro.2001.0016.

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Service reservoirs were built to provide the dual function of balancing supply with demand and provision of adequate head to maintain pressure throughout the distribution network. Changing demographics in the UK and reducing leakage have led to significant increases in water age and hence increased risk of poor water quality. Computational fluid mechanics has been used to study the behaviour of a range of service reservoirs with a rectangular plan form. Detailed analysis of flow distribution and water age suggests that tanks with horizontal inlets are better mixed when compared with vertical t

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8

Dócs, Roland, and Krisztián Mátyás Baracza. "A new method of pressure drop modelling in sandstone rocks." Multidiszciplináris tudományok 12, no. 3 (2022): 264–73. http://dx.doi.org/10.35925/j.multi.2022.3.24.

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Production capacity of any hydrocarbon reservoir is the most important question that needs to be answered. This depends on both the obtainable drawdown between the well and reservoir and the petrophysical properties (pore size distribution, wettability properties, saturations etc.) of the porous rock material. Permeability, introduced by Darcy is the parameter describing restrictions present during fluid flow in porous media. Although this method is the one currently accepted and implemented in the industry it has a major flaw because it considers flow in the geometric (total) rather than the

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9

BULLOUGH, W. A., J. R. KINSELLA, D. J. PEEL, and U. S. URANG. "COMPUTATIONAL FLUID DYNAMICS MODELLING OF ELECTRO-STRUCTURED FLOWS." International Journal of Modern Physics B 15, no. 06n07 (2001): 731–44. http://dx.doi.org/10.1142/s0217979201005210.

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The use of computational fluid dynamics (CFD) software for modelling the flow of electro-structured fluids is introduced. A non-Newtonian fluids package written specifically to model Bingham plastics is validated for several flow rates between stationary parallel plates for varying yield stresses, plate separations and lengths. The computing procedure is rationalised in terms of grid fitting of the 'plug' edge. The programme is modified to include an analytical expression which relates delectro-rheological fluid parameters. This approach is then used to predict valve flow rates from small samp

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10

Vanrolleghem, P., and F. Coen. "Optimal design of in-sensor-experiments for on-line modelling of nitrogen removal processes." Water Science and Technology 31, no. 2 (1995): 149–60. http://dx.doi.org/10.2166/wst.1995.0091.

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In-Sensor-Experiments are proposed as a means of providing highly informative data concerning the bioprocesses occurring in N-removal systems. It is highlighted that the changing nature of both wastewater and activated sludge enforces the continuous adjustment of the proposed In-Sensor-Experiments to maintain the quality of the sensor's outputs. Central to the automated design of the experiments performed in these adaptive sensors is a mathematical representation of the processes occurring in the device. This model is continuously updated on the basis of previously acquired data. It is illustr

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11

Tunçsiper, B., S. Ç. Ayaz, and L. Akça. "Modelling and evaluation of nitrogen removal performance in subsurface flow and free water surface constructed wetlands." Water Science and Technology 53, no. 12 (2006): 111–20. http://dx.doi.org/10.2166/wst.2006.412.

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With the aim of protecting drinking water sources in rural regions, pilot-scale subsurface water flow (SSF) and free water surface flow (FWS) constructed wetland systems were evaluated for removal efficiencies of nitrogenous pollutants in tertiary stage treated wastewaters (effluent from the Paşaköy biological nutrient removal plant). Five different hydraulic application rates and emergent (Canna, Cyperus, Typhia sp., Phragmites sp., Juncus, Poaceae, Paspalum and Iris) and floating (Pistia, Salvina and Lemna) plant species were assayed. The average annual NH4-N, NO3-N and organic-N treatment e

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12

Michelangelli, O. P., M. Yamanoi, A. Gaspar-Cunha, and J. A. Covas. "Modelling pellet flow in single extrusion with DEM." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 225, no. 4 (2011): 255–68. http://dx.doi.org/10.1177/0954408911418159.

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Plasticating single-screw extrusion involves the continuous conversion of loose solid pellets into a pressurized homogeneous melt that is pumped through a shaping tool. Traditional analyses of the solids conveying stage assume the movement of an elastic solid plug at a fixed speed. However, not only the corresponding predictions fail considerably, but it is also well known that, at least in the initial screw turns, the flow of loose individual pellets takes place. This study follows previous efforts to predict the characteristics of such a flow using the discrete element method. The model cons

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13

Watson, Bruce, Mark Rupke, Imre Takács, and Gilles Patry. "MODELLING OF FULL-SCALE WASTEWATER TREATMENT PLANTS: HOW DETAILED SHOULD IT BE?" Water Science and Technology 30, no. 2 (1994): 141–47. http://dx.doi.org/10.2166/wst.1994.0037.

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Dynamic mathematical modelling of full-scale wastewater treatment plants requires an optimal level of detail to be accurate, effective, but still manageable. Single process models tend to oversimplify the complexities of a large-scale plant and result in erroneous calibrated parameter values or limited predictive power for the model – on the other hand, modelling of every process and process unit is usually impractical, since it cannot be supported by reliable plant data, and requires prohibitive sampling costs and effort. Level of aggregation, settler dimensionality and reactivity, and plug-f

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14

Veluchamy, C., Ajay S. Kalamdhad, and Brandon H. Gilroyed. "Evaluating and modelling of plug flow reactor digesting lignocellulosic corn silage." Fuel 287 (March 2021): 119498. http://dx.doi.org/10.1016/j.fuel.2020.119498.

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15

King, Andrew C., Cynthia A. Mitchell, and Tony Howes. "Hydraulic tracer studies in a pilot scale subsurface flow constructed wetland." Water Science and Technology 35, no. 5 (1997): 189–96. http://dx.doi.org/10.2166/wst.1997.0195.

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Current design procedures for Subsurface Flow (SSF) Wetlands are based on the simplifying assumptions of plug flow and first order decay of pollutants. These design procedures do yield functional wetlands but result in over-design and inadequate descriptions of the pollutant removal mechanisms which occur within them. Even though these deficiencies are often noted, few authors have attempted to improve modelling of either flow or pollutant removal in such systems. Consequently the Oxley Creek Wetland, a pilot scale SSF wetland designed to enable rigorous monitoring, has recently been construct

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16

Van Gauwbergen, D., and J. Baeyens. "Macroscopic fluid flow conditions in spiral wound membrane elements: packed bed approach." Water Science and Technology 41, no. 10-11 (2000): 85–91. http://dx.doi.org/10.2166/wst.2000.0615.

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The modelling of the reverse osmosis process is needed to fully evaluate its potential and facilitate scale up. The definition of the flow regime in the concentrate channel is of paramount importance. The present paper describes our experimental investigations on RTD and relates the RTD response curves to the regime of flow in the concentrate channel. Results demonstrate (i) that dead zones are present; (ii) that both a Plug Flow with Dispersion (PFD) and Probabilistic Time Delay (PTD) model can be used to characterise the flow; and (iii) that PFD- and PTD-model parameters assume nearly consta

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17

Chen, Chao, Guo Guang Cheng, Hai Bo Sun, Xin Chao Wang, and Jia Quan Zhang. "Optimization of Flow Control Devices in a Stainless Steel Tundish." Advanced Materials Research 476-478 (February 2012): 156–63. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.156.

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Optimization of FCD design in a single strand slab tundish producing stainless steel is carried out by physical modelling using a 0.4 scale water model and mathematical modelling study. Reducing the residual metal volume at the end of casting, promoting the near-surface plug flow for inclusions removal and improving the transient slab quality are concerned, the optimized FCD is two dams and an impact pad, among them the dam1 (close to ladle shroud) with two 30 degrees upward inclined drain holes, another dam2 (close to tundish exit) is bottom rectangular-grooved which is beneficial for reducin

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18

Liotta, Flavia, Patrice Chatellier, Giovanni Esposito, Massimiliano Fabbricino, Eric D. Van Hullebusch, and Piet N. L. Lens. "Hydrodynamic Mathematical Modelling of Aerobic Plug Flow and Nonideal Flow Reactors: A Critical and Historical Review." Critical Reviews in Environmental Science and Technology 44, no. 23 (2014): 2642–73. http://dx.doi.org/10.1080/10643389.2013.829768.

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19

Lazar, Liliana, Heinz Koeser, Ioana Fechete, and Ion Balasanian. "A Modelling Approach of the Catalytic Oxidation of Volatile Organic Compounds in the SCR-DeNOx Monolithic Reactor." Revista de Chimie 71, no. 7 (2020): 79–87. http://dx.doi.org/10.37358/rc.20.7.8227.

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Monolithic reactors play an important role in the integrated approach to environmental protection, especially in air pollution abatement. Mathematical modelling of catalytic reactors has become a key procedure in the design, development and optimisation of many industrial processes. The objective of this study was the modelling and simulation of the catalytic oxidation of volatile organic compounds by a commercial V2O5-WO3/TiO2 honeycomb catalyst, specific for the SCR-DeNOx process in high-dust flue gases from stationary incineration. The mathematical model is developed for the numerical simul

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20

Ellam, D. J., W. A. Bullough, and R. J. Atkin. "Modelling the flow of an electrostructured fluid in transient operation." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 219, no. 1 (2005): 61–75. http://dx.doi.org/10.1243/095765005x6890.

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This paper is primarily concerned with the feasibility of modelling the flow of electro-structured fluids (ESFs) by the use of computational fluid dynamics (CFD). The non-steady performance of specimen devices in which power, force, or torque is transmitted via an ESF is predicted. This is achieved by incorporating a Bingham plastic type model into a commercial CFD package. Adequately describing the rheology of these fluids requires the use of several parameters. The presence of plug flow and unsteady terms in the equations of motion adds a certain complexity, and a future view of including he

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21

Lapicque, F., and A. Storck. "Modelling of a continuous parallel plate plug flow electrochemical reactor: electrowinning of copper." Journal of Applied Electrochemistry 15, no. 6 (1985): 925–35. http://dx.doi.org/10.1007/bf00614369.

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22

Markoš, Jozef, and Alena Brunovská. "Modelling of fixed bed catalytic reactors with catalyst deactivation under constant-pattern travelling wave assumption." Collection of Czechoslovak Chemical Communications 53, no. 1 (1988): 45–55. http://dx.doi.org/10.1135/cccc19880045.

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The models of fixed bed catalytic reactors in which catalyst deactivation takes place can be significantly simplified by introducing quasi-steady state and constant-pattern travelling wave assumption. This results in faster algorithms. In the present paper the plug-flow, radial dispersion, and well-mixed regions in the series pseudohomogenous models under the above assumptions are discussed. The obtained results are compared with experimental ones in the case of hydrogenation of benzene on a nickel catalyst with thiophene as a poison (irreversible deactivation).

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23

Sans, C., J. Mata-Alvarez, F. Cecchi, and P. Pavan. "Modelling of a plug-flow pilot reactor producing VFA by anaerobic fermentation of municipal solid wastes." Water Science and Technology 30, no. 12 (1994): 125–32. http://dx.doi.org/10.2166/wst.1994.0595.

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The production of volatile fatty acids (VFA) by anaerobic fermentation of municipal solid wastes was studied at pilot-plant level. A plug-flow reactor (80 1 total volume) without solid or liquid recirculation was employed to digest a mixture of two types of organic fraction of the municipal solid waste (OFMSW): OFMSW mechanically selected and OFMSW coming from a market of fruit and vegetables. The acidogenic process was studied at different retention times (between 2 and 6 days) in the mesophilic (37° ± 2°C) range of temperature. The VFA concentration obtained in the first valve of the tubular

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24

Ebuehi, Osaretin N. I., Kingsley Abhulimen, and Daniel O. Adebesin. "Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes." European Journal of Engineering and Technology Research 6, no. 3 (2021): 14–21. http://dx.doi.org/10.24018/ejers.2021.6.3.2391.

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Recently, fuel gas from water has become the center of attention because it is a renewable source of energy and eco-friendly. In this study, the hydrogen gas simulated was obtained from the high-temperature water splitting electrolysis model, because it is more efficient than the low-temperature water splitting electrolysis process. It also releases oxygen as a byproduct. The high-temperature electrolysis model is made up of three loops: primary high-temperature helium loop, secondary helium loop, and high-temperature electrolysis loop. Hydrogen gave a temperature of 27.20C, a pressure of 49.5

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Ebuehi, Osaretin N. I., Kingsley Abhulimen, and Daniel O. Adebesin. "Modelling Production of Renewable Energy from Water Splitting High Thermal Electrolysis Processes." European Journal of Engineering and Technology Research 6, no. 3 (2021): 79–86. http://dx.doi.org/10.24018/ejeng.2021.6.3.2391.

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Recently, fuel gas from water has become the center of attention because it is a renewable source of energy and eco-friendly. In this study, the hydrogen gas simulated was obtained from the high-temperature water splitting electrolysis model, because it is more efficient than the low-temperature water splitting electrolysis process. It also releases oxygen as a byproduct. The high-temperature electrolysis model is made up of three loops: primary high-temperature helium loop, secondary helium loop, and high-temperature electrolysis loop. Hydrogen gave a temperature of 27.20C, a pressure of 49.5

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Hasan Ali San. "A kinetic model for ideal plug-flow reactors." Water Research 23, no. 5 (1989): 647–54. http://dx.doi.org/10.1016/0043-1354(89)90031-6.

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Hayes, C. R., T. N. Croft, A. Campbell, I. P. Douglas, P. Gadoury, and M. R. Schock. "Computational modelling techniques in the optimization of corrosion control for reducing lead in Canadian drinking water." Water Quality Research Journal 49, no. 1 (2013): 82–93. http://dx.doi.org/10.2166/wqrjc.2013.009.

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Compliance modelling has been used to good effect in the optimization of plumbosolvency control in the UK and was evaluated in the Canadian and US contexts via three case studies. In relation to regulatory compliance, supplementary orthophosphate dosing could be justified in one water supply system but not in one other. Compliance modelling indicated that Health Canada's Tier 1 protocol is much less stringent than its Tier 2 protocol and that optimization based on 6+ hour stagnation samples vs 15 μg/l is likely to be more stringent than that based on 30 min stagnation samples vs 10 μg/l. The m

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Kuljanin, Aleksandra, and Natasa Gros. "LabVIEW virtual instrument for zone penetration studies in flow-based analytical systems." Journal of the Serbian Chemical Society, no. 00 (2021): 58. http://dx.doi.org/10.2298/jsc210709058k.

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In the flow method development, zone penetration studies are usually conducted as a part of the initial screening phase. A lack of an appropriate tool can keep these studies on the level of rough estimations. The developed LabVIEW virtual instrument (VI) which processes peak signals and calculates the overlapping area and fundamental peak-related parameters was used for the calculations in experiments that are modelling sample and reagent plug inter-action within liquid conduits. The reliability of the predictions was initially confirmed on the artificial data set based on thirty-six files cov

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29

Khalil, Charbel Abou, Mohamed T. Eraky, and Sophia Ghanimeh. "Localized mixing of anaerobic plug flow reactors." Water Research 204 (October 2021): 117588. http://dx.doi.org/10.1016/j.watres.2021.117588.

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Grzywacz, Robert. "Continuous mathematical models of airlift bioreactors: Families, affinity, diversity and modelling for single-substrate kinetics." Chemical and Process Engineering 33, no. 2 (2012): 291–309. http://dx.doi.org/10.2478/v10176-012-0027-9.

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Continuous mathematical models of airlift bioreactors: Families, affinity, diversity and modelling for single-substrate kinetics This paper presents a method of describing an airlift bioreactor, in which biodegradation of a carbonaceous substrate described by single-substrate kinetics takes place. Eight mathematical models based on the assumption of liquid plug flow and axial dispersion flow through the riser and the downcomer in the reactor were proposed. Additionally, the impact of degassing zone with assumed complete mixing on the obtained results was analyzed. Calculations were performed f

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Zhang, Jiangshan, Shufeng Yang, Jingshe Li, Haiyan Tang, and Zhengyi Jiang. "The Effect of a Dissipative Ladle Shroud on Mixing in Tundish: Mathematical and Experimental Modelling." High Temperature Materials and Processes 37, no. 1 (2018): 25–32. http://dx.doi.org/10.1515/htmp-2016-0093.

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AbstractThe effect of a dissipative ladle shroud (DLS) on mixing in tundish was investigated, compared with that of a conventional ladle shroud (CLS) using mathematical and physical modelling. The tracer profiles of mathematical results, achieved using large eddy simulation, were validated by physical observations employing high-speed cinephotography. The design of a DLS dramatically changed the flow patterns and contributed the intermixing of fluid elements inside the ladle shroud. The vortex flow encouraged the turbulent mixing and was verified by tracking of physical tracer dispersion insid

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Salter, H. E., C. T. Ta, S. K. Ouki, and S. C. Williams. "Three-dimensional computational fluid dynamic modelling of a facultative lagoon." Water Science and Technology 42, no. 10-11 (2000): 335–42. http://dx.doi.org/10.2166/wst.2000.0674.

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A series of facultative lagoons operated by Thames Water treating industrial wastewater in Thailand were found to be performing poorly, particularly with respect to the removal of biological oxygen demand (BOD). A review of the design parameters for the site found that all the lagoons are of a sufficient area for the flow and BOD load. However, observations of the lagoons suggested that there may be significant hydraulic short-circuiting. Computational fluid dynamics (CFD) modelling was therefore carried out on one of the lagoons to establish the hydraulic regime. Two consecutive simulations w

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Scott, Lewis, Antonia Borissova, Alan Burns, and Mojtaba Ghadiri. "Analysis of hold-up and grinding pressure in a spiral jet mill using CFD-DEM." EPJ Web of Conferences 249 (2021): 12004. http://dx.doi.org/10.1051/epjconf/202124912004.

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A spiral jet mill was simulated using Discrete Element Method modelling and Computational Fluid Dynamics. The particle behaviour and fluid motion were analysed as a function of hold-up and grinding pressure. Particle collision energy was predicted to be prevalent along the bed surface and in front of the grinding jets, as shown through the collision data recorded. The bed itself affects the fluid flow field, as momentum is transferred to the particles. Increasing the grinding pressure does not result in a proportional increase in the kinetic energy of the particle system, as the high pressure

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Piazza, Stefania, Mariacrocetta Sambito, and Gabriele Freni. "A Novel EPANET Integration for the Diffusive–Dispersive Transport of Contaminants." Water 14, no. 17 (2022): 2707. http://dx.doi.org/10.3390/w14172707.

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The EPANET model is commonly used to model hydraulic behaviour and water quality within water distribution networks. The standard version of the model solves the advective transport equation by solving a mass balance of the fundamental plug flow substance that considers the advective transport and kinetic reaction processes. Over the years, several versions of the model have been developed, which have made it possible to improve the modelling of water quality through the introduction of additional terms within the transport equation to solve the problem of dispersive transport (EPANET-AZRED) a

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CHIAO, LEROY, and ROBERT G. RINKER. "ON THE USE OF APPROXIMATIONS IN THE MODELLING OF PLUG-FLOW REACTORS UNDER PERIODIC OPERATION." Chemical Engineering Communications 57, no. 1-6 (1987): 153–65. http://dx.doi.org/10.1080/00986448708960482.

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Saunders, D. Curtis, and Jeffrey S. Marshall. "Transient lift force on a blade during cutting of a vortex with non-zero axial flow." Journal of Fluid Mechanics 819 (April 18, 2017): 258–84. http://dx.doi.org/10.1017/jfm.2017.188.

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The problem of orthogonal penetration of a blade into the core of a vortex with non-zero axial flow was studied using a combination of scaling theory, a heuristic plug-flow model and full Navier–Stokes simulations. The particular focus of this paper was to understand the mechanics of the transient lift force that occurs during the initial penetration of the blade leading edge into the vortex core, and the relationship of this transient force to the steady-state lift force that develops due to the difference in vortex core radius over the blade surface. The three modelling approaches all lead t

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Deygout, C., A. Lesne, F. Campillo, and A. Rapaport. "Homogenised model linking microscopic and macroscopic dynamics of a biofilm: Application to growth in a plug flow reactor." Ecological Modelling 250 (February 2013): 15–24. http://dx.doi.org/10.1016/j.ecolmodel.2012.10.020.

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Stamou, Anastasios I. "Modelling of oxidation ditches using an open channel flow 1-D advection-dispersion equation and ASM1 process description." Water Science and Technology 36, no. 5 (1997): 269–76. http://dx.doi.org/10.2166/wst.1997.0214.

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A river water quality model is presented for the prediction of the concentration fields of the water quality variables in an oxidation ditch performing carbon oxidation, nitrification and denitrification. The model involves the one-dimensional convection-dispersion equations for all the variables, which are described in the IAWPRC Activated Sludge Model No 1. The model is applied to a typical oxidation ditch to show that all variables, with the exception of DO, are uniformly distributed in the ditch; thus permitting the characterisation of the oxidation ditch as a completely mixed reactor. The

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Voglar, Jure, Andraž Pavlišič, and Blaž Likozar. "Computational Fluid Dynamics, Transport, and Chemical Kinetics-Based Monolith Catalyst Dimensioning Methodology for Cost-Effective Performance." Processes 12, no. 8 (2024): 1704. http://dx.doi.org/10.3390/pr12081704.

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The newly developed computational fluid dynamics, transport, and chemical kinetics-based monolith catalyst dimensioning methodology consists of the following steps: (i) initial calculations, which generate some of the data, e.g., average inlet fluid velocity used in the (ii) computational fluid dynamics (CFD) modelling, which uses the laminar flow interface and the transport of diluted species interface while the user has to provide the kinetics of the reactions; (iii) the model order reduction uses a modified version of the plug flow reactor model and the linear pressure variation model; and

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Pérez, Andrea, and Patricia Torres. "Evaluation of hydrodynamic behavior as a tool to optimize anaerobic reactors of attached growth." Revista Facultad de Ingeniería Universidad de Antioquia, no. 45 (December 13, 2013): 27–40. http://dx.doi.org/10.17533/udea.redin.17963.

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The conditions of the non-ideal flow in reactors affect their performance; the common causes are short circuits, dead zones and internal recirculation by kinetics and/or density stream. In this study, the design of an anaerobic filter at full scale that treats cassava starch wastewater was optimized. It presented halt damming problems and low removal efficiencies. The initial hydrodynamic behavior showed the presence of dual flow (32% plug flow - PF and 37% mixed flow -MF), dead zones (20%) and absence of short circuits; additionally the modelling reactor indicated a high dispersion degree and

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Amaral, Andreia, Oliver Schraa, Leiv Rieger, et al. "Towards advanced aeration modelling: from blower to bubbles to bulk." Water Science and Technology 75, no. 3 (2016): 507–17. http://dx.doi.org/10.2166/wst.2016.365.

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Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow reactors, and empirical correlations are used to describe the impact of operating conditions on bubble formation and transport, and oxygen transfer from the bubbles to the bulk liquid. However, the mechanisms i

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ATALAR, Aydın. "Modelling PV system with Electric Vehicles in a Micro Grid." Hendese Teknik Bilimler ve Mühendislik Dergisi 2, no. 1 (2025): 32–37. https://doi.org/10.5281/zenodo.15278187.

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The growing deployment of plug-in hybrid electric vehicles (PHEVs) alongside residential photovoltaic (PV) systems introduces new operational complexities for modern power grids, particularly concerning load balancing and voltage regulation. This paper presents a comprehensive modeling framework that integrates a detailed PHEV demand model and a probabilistic PV generation model to assess security-related constraints in a microgrid environment. The proposed PHEV model accounts for user-specific behavior, including demographic employment patterns, brand-based vehicle specifications, and varying

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Olsvik, O., and F. Billaud. "Modelling of the decomposition of methane at 1273 K in a plug flow reactor at low conversion." Journal of Analytical and Applied Pyrolysis 25 (June 1993): 395–405. http://dx.doi.org/10.1016/0165-2370(93)80058-8.

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Donoso-Bravo, Andrés, Constanza Sadino-Riquelme, Daniel Gómez, Camilo Segura, Emky Valdebenito, and Felipe Hansen. "Modelling of an anaerobic plug-flow reactor. Process analysis and evaluation approaches with non-ideal mixing considerations." Bioresource Technology 260 (July 2018): 95–104. http://dx.doi.org/10.1016/j.biortech.2018.03.082.

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Jacobsen, J. L., H. Madsen, and P. Harremoès. "A stochastic model for two-station hydraulics exhibiting transient impact." Water Science and Technology 36, no. 5 (1997): 19–26. http://dx.doi.org/10.2166/wst.1997.0156.

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The objective of the paper is to interpret data on water level variation in a river affected by overflow from a sewer system during rain. The simplest possible, hydraulic description is combined with stochastic methods for data analysis and model parameter estimation. This combination of deterministic and stochastic interpretation is called grey box modelling. As a deterministic description the linear reservoir approximation is used. A series of linear reservoirs in sufficient number will approximate a plug flow reactor. The choice of number is an empirical expression of the longitudinal dispe

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Kaplan, Louis A., and J. Denis Newbold. "Measurement of streamwater biodegradable dissolved organic carbon with a plug-flow bioreactor." Water Research 29, no. 12 (1995): 2696–706. http://dx.doi.org/10.1016/0043-1354(95)00135-8.

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Donoso-Bravo, Andrés, María Constanza Sadino-Riquelme, Martín Vicencio, Fernando Zorrilla, Bastián Valdebenito, and Felipe Hansen. "How Scheduled Maintenance Affects Anaerobic Digester Supervision Through Modelling: A Practical Approach." Methane 3, no. 4 (2024): 561–68. http://dx.doi.org/10.3390/methane3040031.

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Anaerobic digestion plays a crucial role in the transition toward a circular economy. Incorporating system supervision through mathematical modelling can enhance control and resilience. This study aims to assess the impact of scheduled digester maintenance on the effectiveness of modelling as a tool for monitoring and control. Data from a pilot-scale plug-flow digester were analyzed using an adapted ADM1 model. The maintenance involved halting the digester and removing sedimented solids. Model calibration indicated solid retention in the first two zones of the reactor, while the hydrolysis coe

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Sanvitale, Nicoletta, and Elisabeth T. Bowman. "Visualization of dominant stress-transfer mechanisms in experimental debris flows of different particle-size distribution." Canadian Geotechnical Journal 54, no. 2 (2017): 258–69. http://dx.doi.org/10.1139/cgj-2015-0532.

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Physical modelling of debris flow in a small-scale flume has been carried out to investigate the internal stress-transfer mechanisms within unsteady, saturated, and segregating granular free-surface flows. Measurements of the internal velocity fields within model flows were obtained via planar laser–induced fluorescence and particle image velocimetry. Normalized velocity profiles taken at a section over the flow duration were found to essentially collapse onto a single curve, the shape of which was dependent on the particle-size distribution. While all flows exhibited internal basal slip and s

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Alexiadis, Alessio. "Bubble dispersion patterns in bubbly-flow released from a porous plug into a gas-stirred ladle." Applied Mathematical Modelling 31, no. 8 (2007): 1534–47. http://dx.doi.org/10.1016/j.apm.2006.05.005.

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Ramasetti, Visuri, Sulasalmi, Fabritius, Savolainen, and Li. "Numerical Modelling of the Influence of Argon Flow Rate and Slag Layer Height on Open-Eye Formation in a 150 Ton Steelmaking Ladle." Metals 9, no. 10 (2019): 1048. http://dx.doi.org/10.3390/met9101048.

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A transient computational fluid dynamics (CFD) modelling approach was used to study the complex multi-phase flow in an argon-stirred industrial scale ladle with a nominal capacity of 150 tons. During the stirring process, when gas was injected through the porous plug from the bottom into the steel bath, it breaks up into bubbles and infringes the slag layer creating an open-eye. The volume of fluid model was used to investigate the open-eye formation process in the simulations. In the numerical simulations, the open-eye area changed from 0.7 to 2.24 m2 with the increment of argon flow rate fro

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