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Journal articles on the topic 'Mass transfer-solution modelling'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Simal, Susana, J. A. Cárcel, J. Bon, Á. Castell-Palou, and Carmen Rosselló. "Mass Transfer Modelling in an Acoustic-Assisted Osmotic Process." Defect and Diffusion Forum 258-260 (October 2006): 600–609. http://dx.doi.org/10.4028/www.scientific.net/ddf.258-260.600.

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Ultrasounds are mechanical waves that produce different effects when travelling through a medium, some related to mass transfer (i.e. microstirring at the interface, the so called "sponge effect" and cavitations). Thus, ultrasound appears to be a way to reduce both the internal and external resistances in osmotic food drying processes. In this study, the influence of the ultrasounds on water and solute transports during osmotic processes of drying is evaluated. Two different systems have been studied, apple slabs immersed in 30ºBrix sucrose solution, and pork loin slabs in sodium chloride satu

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2

Ndiaye, L., Mb Ndiaye, A. Sy, and D. Seck. "Pollution Transfer as Optimal Mass Transport Problem." Journal of Mathematics Research 8, no. 6 (2016): 58. http://dx.doi.org/10.5539/jmr.v8n6p58.

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In this paper, we use mass transportation theory to study pollution transfer in porous media. We show the existence of a $L^2-$regular vector field defined by a $W^{1, 1}-$ optimal transport map. A sufficient condition for solvability of our model, is given by a (non homogeneous) transport equation with a source defined by a measure. The mathematical framework used, allows us to show in some specifical cases, existence of solution for a nonlinear PDE deriving from the modelling. And we end by numerical simulations.

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3

Wendler, B., B. Goers, and G. Wozny. "Regeneration of process water containing surfactants by nanofiltration - investigation and modelling of mass transport." Water Science and Technology 46, no. 4-5 (2002): 287–92. http://dx.doi.org/10.2166/wst.2002.0607.

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The mechanisms in nanofiltration of aqueous solutions of different anionic surfactants and of mixture solutions of surfactants and NaCl are investigated. The surfactants used are sodium dodecylether sulfate, sodium dodecyl sulfate and sodium alkyl benzene sulfonate. High retentions in the range of 95% up to 99.9% referring to the feed concentration are found to depend on the solvent flux. If additional salt is present in the solution, the permeate quality is deteriorating because of lower solvent flux and of mass transfer due to the electrical potential. The experimental results show that conv

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4

Aprile, Marcello, and Mario Motta. "Modelling of a desiccant rotor by using the collocation method." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 1 (2013): 201–20. http://dx.doi.org/10.1108/hff-02-2012-0035.

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Purpose – This article aims to develop a fast numerical method for solving the one-dimensional heat and mass transfer problem within a desiccant rotor. Design/methodology/approach – The collocation method is used for discretizing the axial dimension and reducing the number of dependent variables. The resulting system of equation is then solved through backward differentiation formulas. Findings – The numerical results obtained here focus on verifying the accuracy and the computation time of the proposed method with respect to the finite difference method. The proposed numerical solution method

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5

Álvarez, María E., and Mahmoud Bourouis. "Modelling of Coupled Heat and Mass Transfer in a Water-Cooled Falling-Film Absorber Working with an Aqueous Alkaline Nitrate Solution." Energies 14, no. 7 (2021): 1804. http://dx.doi.org/10.3390/en14071804.

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A theoretical model was developed to investigate a falling-film absorber on horizontal tubes with an aqueous alkaline nitrate solution as working fluid. The absorbent, composed of an aqueous solution of nitrates (Li, K, Na) in salt mass percentages of 53%, 28%, and 19% respectively, offers favourable thermal stability, corrosiveness, and heat and mass transfer conditions which can be appropriate for absorption cooling cycles driven by high-temperature heat sources. The mathematical model developed characterises the heat and mass transfer processes and the flow regime effect (droplet-formation,

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6

See, Tan Lian, Tay Wee Horng, Kok Keong Lau, and Mohd Shariff Azmi. "Modelling of High Pressure, High Concentration Carbon Dioxide Capture in Absorption Column." Applied Mechanics and Materials 773-774 (July 2015): 1138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1138.

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With the depletion of low carbon dioxide (CO2) content natural gas reserves, there is a pressing need to explore the vastly undeveloped high CO2 content natural gas reserves and reduce the release of greenhouse gas CO2 into environment. Our previous investigation on the absorption performance of CO2 at high concentration level of 50% from mixture of CO2-natural gas stream for 20wt% monoethanolamine (MEA) solution in countercurrent packed column indicated efficient removal at high pressure condition. In this present work, a combination mass transfer, chemical reaction of MEA as well as mass con

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7

Moreira, Ramón, Francisco Chenlo, N. Vallejo, and Lionel Gerbet. "Mass Transfer Analysis during Osmotic Dehydration of Eggplant Using Binary Solutions of Sucrose and Sodium Chloride." Defect and Diffusion Forum 273-276 (February 2008): 413–18. http://dx.doi.org/10.4028/www.scientific.net/ddf.273-276.413.

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Osmotic dehydration of eggplant slices in sucrose and sodium chloride solutions at different solution concentrations, stirring levels and time of process is studied. Water loss and solids gain kinetics were experimentally determined and modelled using a diffusional model and equilibrium values were predicted by means of Azuara model. Modelling was satisfactory and involved effective coefficients of diffusion useful to quantify the different mass transfer fluxes.

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8

Conner, J. M., and S. E. Elghobashi. "Numerical Solution of Laminar Flow Past a Sphere With Surface Mass Transfer." Numerical Heat Transfer, Part B: Fundamentals 12, no. 1 (1987): 57–82. http://dx.doi.org/10.1080/10407798708552567.

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9

Hayat, Tasawar, Saima Noreen, and Muhammad Qasim. "Influence of Heat and Mass Transfer on the Peristaltic Transport of a Phan-Thien–Tanner Fluid." Zeitschrift für Naturforschung A 68, no. 12 (2013): 751–58. http://dx.doi.org/10.5560/zna.2013-0068.

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In this paper, we discuss the effects of heat and mass transfer on the peristaltic flow in the presence of an induced magnetic field. Constitutive equations of a Phan-Thien-Tanner fluid are utilized in the mathematical description. Mathematical modelling is based upon the laws of mass, linear momentum, energy, and concentration. Relevant equations are simplified using long wavelength and low Reynolds number assumptions. A series solution is presented for small Weissenberg number. Variations of emerging parameters embedded in the flow system are discussed.

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10

Sandu, Vlad-Cristian, Ana-Maria Cormos, and Calin-Cristian Cormos. "Fuel Reactor CFD Multiscale Modelling in Syngas-Based Chemical Looping Combustion with Ilmenite." Energies 14, no. 19 (2021): 6059. http://dx.doi.org/10.3390/en14196059.

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As global power generation is currently relying on fossil fuel-based power plants, more anthropogenic CO2 is being released into the atmosphere. During the transition period to alternative energy sources, carbon capture and storage seems to be a promising solution. Chemical-looping combustion (CLC) is an energy conversion technology designed for combustion of fossil fuel with advantageous carbon capture capabilities. In this work, a 1D computational fluid dynamics (CFD) multiscale model was developed to study the reduction step in a syngas-based CLC system and was validated using literature da

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11

Vlasyuk, Anatolii, and Tatiana Tsvietkova. "Mathematical Modelling of Mass Transfer in Zones of Complete and Incomplete Saturation under the Action of Systematic Combined Drainage." Modeling, Control and Information Technologies, no. 3 (November 6, 2019): 86–87. http://dx.doi.org/10.31713/mcit.2019.44.

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The mathematical model of a processes mass transfer in saturated and unsaturated porous media to the filtertrap in isothermal conditions to the system of vertical drains is presented. The numerical solution of the respective boundary value problem was obtained by the method of finite differences using the numerical method of conformal mappings in an inverse statement.

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12

Trelea, I. C., A. L. Raoult-Wack, and G. Trystram. "Note: Application of neural network modelling for the control of dewatering and impregnation soaking process (osmotic dehydration) Nota: Aplicación del sistema de simulación de redes neurales para el control de la deshidratación osmótica." Food Science and Technology International 3, no. 6 (1997): 459–65. http://dx.doi.org/10.1177/108201329700300608.

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The aim of this work was to elaborate a predictive model of the mass transfer (water loss and solute gain) that occurs during dewatering and soaking by using neural network modelling. Two separate feedforward networks with one hidden layer were used (for water loss and solute gain respectively). Model validation was carried out on results obtained previously, which dealt with agar gel soaked in sucrose solution over a wide experimental range (temperature, 30-70 °C; solu tion concentration, 30-70 g sucrose/100 g solution; time 0-500 min; agar concentration, 2-8%). The best results were obtained

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13

Nawaz, Zeeshan. "Methyl-Tert-Butyl-Ether Synthesis Reactor Modelling and Optimization Using an Aspen Custom Modeler." Hungarian Journal of Industry and Chemistry 45, no. 2 (2017): 1–7. http://dx.doi.org/10.1515/hjic-2017-0012.

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Abstract A pseudo-homogeneous model of methyl-tert-butyl-ether (MTBE) synthesis in a multi-tubular packed-bed reactor has been developed using an Aspen Custom Modeler (ACM) for selecting optimum operating strategies, for the maximization and enhancement of MTBE production, and isobutylene consumption, respectively. The model accounts for mass, energy and momentum balances; and the effectiveness factor is evaluated in a onedimensional pseudo-homogeneous model. The kinetic investigation contains kinetic rate expressions as given by the effectiveness factor for accounting the resistance of pellet

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14

Kolmychkov, V. V. "COMPUTER SIMULATION FOR SUBCRITICAL CONVECTION IN MULTI‐COMPONENT ALLOYS." Mathematical Modelling and Analysis 11, no. 1 (2006): 57–71. http://dx.doi.org/10.3846/13926292.2006.9637302.

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Subcritical convection with hexagonal flow pattern is registered in 3D computer simulation of convective mass transfer in ternary solution under phase transition conditions. The calculations are evaluated by the classical theory of hydrodynamic stability and display a good agreement with linear and finite amplitude stability analysis. Key words: convective instability, subcritical convection, computer simulation.

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15

Hayat, T., M. Qasim, and Z. Abbas. "Homotopy solution for the unsteady three-dimensional MHD flow and mass transfer in a porous space." Communications in Nonlinear Science and Numerical Simulation 15, no. 9 (2010): 2375–87. http://dx.doi.org/10.1016/j.cnsns.2009.09.013.

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16

Mohamad Aziz, Siti Norazimah, and Mimi Sakinah Abdul Munaim. "MATHEMATICAL MODELLING OF BACKWARD EXTRACTION MIXED REVERSE MICELLE OF AMOXICILLIN BY SURFACE RESPONSE METHODOLOGY (RSM)." Journal of Chemical Engineering and Industrial Biotechnology 2, no. 1 (2017): 47–58. http://dx.doi.org/10.15282/jceib.v2i1.3816.

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One of important factor in reverse micelle extraction is backward transfer. It is important to investigate the favourable conditions for backward transfer from reverse micellar phase to an organic phase. The back extraction of amoxicillin was studied using mixed reverse micelle with combination sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and TWEEN 85. Backward extraction was optimized via response surface methodology (RSM). For mathematical modelling, Central Composite Design (CCD) was used to studies the significant of independent variables: pH of stripping solution (5-8), KCl concentration

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17

Adeyanju, James Abiodun, John Oluranti Olajide, Emmanuel Olusola Oke, and Akinbode Adeyemi Adedeji. "Mathematical Modelling and Numerical Simulation of Mass Transfer During Deep-Fat Frying of Plantain (Musa paradisiacal AAB) Chips (ipekere)." Acta Universitatis Cibiniensis. Series E: Food Technology 24, no. 2 (2020): 247–56. http://dx.doi.org/10.2478/aucft-2020-0022.

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Abstract This study developed a mathematical model following the fundamental principles of mass transfer for the simulation of the oil and moisture content change during the Deep-Fat Frying of plantain (ipekere) chip. The explicit Finite Difference Technique (FDT) was used to conduct a numerical solution to the consequential governing equation (partial differential equation) that was used to describe the mass transfer rate during the process. Computer codes that were computed in MATLAB were used for the implementation of FDT at diverse frying conditions. Samples of the plantain were cut into p

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18

Ban, Zhen Hong, Kok Keong Lau, and Mohd Sharif Azmi. "Bubble Nucleation and Growth of Dissolved Gas in Solution Flowing across a Cavitating Nozzle." Applied Mechanics and Materials 773-774 (July 2015): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.304.

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Computational modelling of dissolved gas bubble formation and growth in supersaturated solution is essential for various engineering applications, including flash vaporisation of petroleum crude oil. The common mathematical modelling of bubbly flow only caters for single liquid and its vapour, which is known as cavitation. This work aims to simulate the bubble nucleation and growth of dissolved CO2 in water across a cavitating nozzle. The dynamics of bubble nucleation and growth phenomenon will be predicted based on the hydrodynamics in the computational domain. The complex interrelated bubble

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19

Trushnikov, Dmitriy, Anatoly Perminov, Shengyong Pang, et al. "Modelling of Heat and Mass Transfer for Wire-Based Additive Manufacturing Using Electric Arc and Concentrated Sources of Energy." International Journal of Engineering & Technology 7, no. 4.38 (2018): 741. http://dx.doi.org/10.14419/ijet.v7i4.38.25777.

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The paper presents a model developed by the authors and aimed to describe heat and mass transfer during wire-based additive manufacturing, when electron beam, plasma or arc are used as energy sources in case of non-consumable electrode welding. The model describes non-stationary and non-equilibrium conjugated processes of heat and mass transfer in free-surface liquid metal. The solution of differential equations of viscous fluid motion (Navier-Stokes), with convective terms and at laminar flow, has become the model base. Melting and crystallization of the metal is recognized by heat release in

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20

Kalweit, M., and D. Drikakis. "Coupling strategies for hybrid molecular—continuum simulation methods." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 5 (2008): 797–806. http://dx.doi.org/10.1243/09544062jmes716.

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The paper presents numerical issues with regard to the development of hybrid molecular—continuum computational methods for macro and nanoscale modelling of nanoflows and materials. The implementation is based on a hybrid solution interface between the continuum and molecular regions. Two different approaches for the transfer of the mass, momentum, and energy fluxes onto the boundary of the molecular dynamics domain, are considered: (a) momentum transfer by force and (b) momentum transfer by velocity reversing. Simulations performed for a static fluid and free flow between molecular and continu

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21

Dermesonlouoglou, Efimia K., and Maria C. Giannakourou. "Modelling dehydration of apricot in a non-conventional multi-component osmotic solution: effect on mass transfer kinetics and quality characteristics." Journal of Food Science and Technology 55, no. 10 (2018): 4079–89. http://dx.doi.org/10.1007/s13197-018-3334-4.

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22

Georgieva, Nedyalka, Zvezdelina Yaneva, and Nevena Nikolova. "Direct Red 28 Adsorption on Amosil and Avena sativa L.: Mass Transfer and Kinetics Modelling on the Solid/Solution Interface." Journal of Solution Chemistry 46, no. 9-10 (2017): 1723–40. http://dx.doi.org/10.1007/s10953-017-0633-8.

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23

Ban, Zhen Hong, Kok Keong Lau, and Mohd Shariff Azmi. "Modelling of Bubble Growth in Supersaturated Solution Using Computational Fluid Dynamics - Population Balance Model (CFD-PBM) Approach." Defect and Diffusion Forum 362 (April 2015): 200–208. http://dx.doi.org/10.4028/www.scientific.net/ddf.362.200.

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The bubble growth modelling in a supersaturated solution is difficult to be accomplished as it requires coupling of many interrelated hydrodynamics and mass transfer parameters which include pressure drop, supersaturation ratio, bubble size, etc. In the current work, all these factors have been taken into consideration to predict bubble growth in a supersaturated solution using Computational Fluid Dynamics (CFD) – Population Balance Model (PBM) approach. A classical bubble growth model has been used in the simulation. The bubble growth rate was successfully validated with experimental data in

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24

Lorimer, Shelley, Ryan Boehnke, and Brigida Meza. "Mass Transfer Behaviour in Hybrid Solvent Oil Recovery Processes." Defect and Diffusion Forum 367 (April 2016): 77–85. http://dx.doi.org/10.4028/www.scientific.net/ddf.367.77.

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The mechanisms of mass transfer in thermal solvent enhanced oil recovery processes and the influence of grid size in the numerical simulation of these processes is not well understood [1, 2]. The literature has indicated that, experimentally, solvent fronts progress more rapidly that what can be predicted using current approximations [3]. It has also been shown that under certain modelling conditions with coarser grid meshes, the influence of numerical errors can be substantial. The equations that govern thermal/solvent multiphase flow through porous media are extremely complex and it is very

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Sokolowsky, Jajanek. "ON NONISOTHERMAL TWO‐FLUID CHANNEL FLOWS." Mathematical Modelling and Analysis 12, no. 1 (2007): 143–56. http://dx.doi.org/10.3846/1392-6292.2007.12.143-156.

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Two‐fluid channel flows arise in different kinds of coating technologies. The corresponding mathematical models represent two‐dimensional free boundary value problems for the Navier‐Stokes equations or their modifications. In this paper we are concerned with the so‐called Boussinesq‐approximation of the coupled heat‐ and mass transfer. Thermocapillary convection is included. The solvability of two related stationary problems is discussed. The solution techniques of both problems are quite different. The obtained results generalize previous results for similar isothermal problems.

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26

Mungma, Nuttakul, Marlene Kienberger, and Matthäus Siebenhofer. "Reactive Extraction of Lactic Acid, Formic Acid and Acetic Acid from Aqueous Solutions with Tri-n-octylamine/1-Octanol/n-Undecane." ChemEngineering 3, no. 2 (2019): 43. http://dx.doi.org/10.3390/chemengineering3020043.

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The present work develops the basics for the isolation of lactic acid, acetic acid and formic acid from a single as well as a mixed feed stream, as is present, for example, in fermentation broth for lactic acid production. Modelling of the phase equilibria data is performed using the law of mass action and shows that the acids are extracted according to their pka value, where formic acid is preferably extracted in comparison to lactic and acetic acid. Back-extraction was performed by 1 M NaHCO3 solution and shows the same tendency regarding the pka value. Based on lactic acid, the solvent phas

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27

Bilal, Sardar, Afraz Hussain Majeed, Rashid Mahmood, Ilyas Khan, Asiful H. Seikh, and El-Sayed M. Sherif. "Heat and Mass Transfer in Hydromagnetic Second-Grade Fluid Past a Porous Inclined Cylinder under the Effects of Thermal Dissipation, Diffusion and Radiative Heat Flux." Energies 13, no. 1 (2020): 278. http://dx.doi.org/10.3390/en13010278.

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Current disquisition is presented to excogitate heat and mass transfer features of second grade fluid flow generated by an inclined cylinder under the appliance of diffusion, radiative heat flux, convective and Joule heating effects. Mathematical modelling containing constitutive expressions by obliging fundamental conservation laws are constructed in the form of partial differential equations. Afterwards, transformations are implemented to convert the attained partial differential system into ordinary differential equations. An implicit finite difference method known as the Keller Box was cho

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Pradhan, R., K. Swain, and G. C. Dash. "Hydromagnetic Heat and Mass Transfer on a Permeable Flat Surface Embedded in a Porous Medium." Modelling, Measurement and Control B 89, no. 1-4 (2020): 1–6. http://dx.doi.org/10.18280/mmc_b.891-401.

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The steady boundary layer viscous incompressible fluid flow on a permeable flat plate embedded in a porous medium has been considered in the present study. The momentum transport phenomena are subjected to external magnetic field, permeability of the porous medium and cross flow due to presence of suction and injection. Moreover, the heat transfer phenomena consider the loss of thermal energy due to radiation and mass transfer phenomena accounts for the generative/destructive chemical reaction of the reactive species as well. Most importantly, the temperature dependent viscosity and thermal co

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29

Psaltaki, M., and N. C. Markatos. "Modelling and assessment of 137-Cs and of heavy metals impact on marine ecosystems." HNPS Proceedings 19 (January 1, 2020): 119. http://dx.doi.org/10.12681/hnps.2524.

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Modelling is an important and useful tool for predicting the behaviour and the impact of pollutants on the local ecosystem parameters. More specifically, simulation and computational methods can be used for estimating the environmental impact on marine ecosystems.The paper presents a three-dimensional general deterministic model, developed to simulate and study the time-dependent behaviour of 137Cs in marine environments. The model capabilities are demonstrated by applying it at the northeast region of the island of Lemnos, in the NE Aegean Sea, Greece. Full Navier-Stokes equations for transie

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Schneider, Philip A., James W. Wallace, and Julian C. Tickle. "Modelling and dynamic simulation of struvite precipitation from source-separated urine." Water Science and Technology 67, no. 12 (2013): 2724–32. http://dx.doi.org/10.2166/wst.2013.184.

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A model of a mixed-mode nutrient recovery reactor is developed for a urine feed, incorporating complex solution thermodynamics, dynamic conservation relations and a power-law kinetic expression for crystal growth from seed crystals. Simulations at nominal operating conditions predict phosphorus recoveries greater than 99%, based on existing process kinetic parameters and operating conditions employed in previously published studies. The overall rate of nutrient recovery depends on the saturation index of the precipitating solid, the available surface area for mass transfer and the feed rate of

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31

Asendrych, Dariusz, Paweł Niegodajew, and Stanisław Drobniak. "CFD Modelling of CO2 Capture in a Packed Bed by Chemical Absorption." Chemical and Process Engineering 34, no. 2 (2013): 269–82. http://dx.doi.org/10.2478/cpe-2013-0022.

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The paper deals with numerical modelling of carbon dioxide capture by amine solvent from flue gases in post-combustion technology. A complex flow system including a countercurrent two-phase flow in a porous region, chemical reaction and heat transfer is considered to resolve CO2 absorption. In order to approach the hydrodynamics of the process a two-fluid Eulerian model was applied. At the present stage of model development only the first part of the cycle, i.e. CO2 absorption was included. A series of parametric simulations has shown that carbon dioxide capture efficiency is mostly influenced

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32

Kačur, Jozef, and J. Minár. "Solution of Direct and Inverse Problems for Infiltration and Contaminant Adsorption in Partially Saturated Porous Media." Defect and Diffusion Forum 354 (June 2014): 129–43. http://dx.doi.org/10.4028/www.scientific.net/ddf.354.129.

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We discuss the numerical modelling of unsaturated-saturated flow in porous media and contaminant transport with adsorption in 1D. We developed an efficient numerical approximation which is a good candidate for solving inverse problems involving the determination of model parameters (hydraulic and geochemical). Also an adsorption/desorption model for mass transfer through the boundary of porous media (contact solid-liquid) is discussed, too. Our numerical solution is based on the MOL method where space discretization leads to the corresponding system of ODE. To collect the measurement data for

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Oyelakin, I. S., S. Mondal, P. Sibanda, and D. Sibanda. "Bioconvection in Casson nanofluid flow with Gyrotactic microorganisms and variable surface heat flux." International Journal of Biomathematics 12, no. 04 (2019): 1950041. http://dx.doi.org/10.1142/s1793524519500414.

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This paper presents a two-dimensional unsteady laminar boundary layer mixed convection flow heat and mass transfer along a vertical plate filled with Casson nanofluid located in a porous quiescent medium that contains both nanoparticles and gyrotactic microorganisms. This permeable vertical plate is assumed to be moving in the same direction as the free stream velocity. The flow is subject to a variable heat flux, a zero nanoparticle flux and a constant density of motile microorganisms on the surface. The free stream velocity is time-dependent resulting in a non-similar solution. The transport

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K., Anantha Kumar, Sugunamma V., Sandeep N., and Ramana Reddy J.V. "Impact of Brownian motion and thermophoresis on bioconvective flow of nanoliquids past a variable thickness surface with slip effects." Multidiscipline Modeling in Materials and Structures 15, no. 1 (2019): 103–32. http://dx.doi.org/10.1108/mmms-02-2018-0023.

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Purpose The purpose of this paper is to scrutinize the heat and mass transfer attributes of three-dimensional bio convective flow of nanofluid across a slendering surface with slip effects. The analysis is carried out subject to irregular heat sink/source, thermophoresis and Brownian motion of nanoparticles. Design/methodology/approach At first, proper transmutations are pondered to metamorphose the basic flow equations as ODEs. The solution of these ODEs is procured by the consecutive application of Shooting and Runge-Kutta fourth order numerical procedures. Findings The usual flow fields alo

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CALABRÒ, FRANCESCO, and PAOLO ZUNINO. "ANALYSIS OF PARABOLIC PROBLEMS ON PARTITIONED DOMAINS WITH NONLINEAR CONDITIONS AT THE INTERFACE: APPLICATION TO MASS TRANSFER THROUGH SEMI-PERMEABLE MEMBRANES." Mathematical Models and Methods in Applied Sciences 16, no. 04 (2006): 479–501. http://dx.doi.org/10.1142/s0218202506001236.

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In this work we address a problem governed by linear parabolic partial differential equations set in two adjoining domains, coupled by nonlinear interface conditions of Neumann type. In particular, we address the existence and uniqueness of strong solutions by applying the strong maximum principle, the Schauder fixed point theorem and the fundamental solutions of linear parabolic partial differential equations.In the first part of this work, we consider the properties of a linear parabolic partial differential equation set on a single domain with a nonlinear boundary condition. After having ad

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Rose, D. A., M. A. Adey, and M. Al-Sibai. "Laboratory experiments and modelling studies of leaching of intermittently drained columns." Soil Research 38, no. 4 (2000): 891. http://dx.doi.org/10.1071/sr99126.

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This paper examines the intermittent leaching of columns of porous ceramic spheres, as analogues of soil aggregates, in 3 ways: theoretically, by laboratory experiments, and by simulation. The work extends earlier investigations of continuously saturated columns to the case where columns drain during breaks in the leaching process.Solute movement during displacement is described by the mobile–immobile convection–dispersion equation but, because air replaces solution as the soil drains, it is considered to be immiscible rather than miscible displacement. During the rest period solute redistribu

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Dhaundiyal, Alok, and Laszlo Toth. "Modelling of a Torrefaction Process Using Thermal Model Object." Energies 14, no. 9 (2021): 2481. http://dx.doi.org/10.3390/en14092481.

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So far, the torrefaction process has been merely discussed based on the physical and chemical characteristics of the final product, but the mechanism has not been yet pondered and investigated. Thus far, microwave torrefaction has been predominately used for thermal pre-treatment; therefore, a paradigm shift in the methodology has been introduced by using a Joule heating system. The article mainly focuses on the thermal engineering aspect of the torrefaction process. The densified black pine underwent thermal pre-treatment at a temperature of 523 K. The furnace used for torrefaction was initia

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Vázquez da Silva, M., and J. M. P. Q. Delgado. "Fundamentals and Application of Osmotic Dehydration." Diffusion Foundations 7 (June 2016): 14–29. http://dx.doi.org/10.4028/www.scientific.net/df.7.14.

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Osmotic dehydration is a water removal process that consists of placing foods, such as pieces of fruits and vegetables, in a hypertonic solution. Both mass fluxes lead to a decrease of the water activity in the product, increasing its shelf life. It can be used as a single dehydration process or as a pre-treatment of other processes such as drying, pasteurization or freezing. Heat and mass transfer gradients associated to the process produce changes in the chemical, physical and structural characteristics of the vegetable tissue. The knowledge and prediction of these changes are very important

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Oliveira, Alexandre S., Claudia V. Rodrigues, Matheus S. Palhares, Marcos P. Diaz, Diogo Belloni, and Karleyne M. G. Silva. "Optical observations and cyclops post-shock region modelling of the polar V348 Pav." Monthly Notices of the Royal Astronomical Society 489, no. 3 (2019): 4032–42. http://dx.doi.org/10.1093/mnras/stz2445.

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ABSTRACT Post-shock regions (PSR) of polar cataclysmic variables (CVs) produce most of their luminosity and give rise to high circular polarization in optical wavelengths and strong variability on the white dwarf (WD) rotation period, which are distinctive features of these systems. To investigate the polar candidate V348 Pav, we obtained a comprehensive observational set including photometric, polarimetric, and spectroscopic data, which was used to constrain the post-shock properties of the system. The object presents high circular polarization (∼30 per cent) and high He ii 4686 Å to H β line

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Saab, Joseph, Ramy Abou Naccoul, Juliette Stephan, et al. "Mass Transfer of Carbaryl from Pure Water to Salt Aqueous Solution: Result Comparison Between Sea and Lab-Made Water." Water, Air, & Soil Pollution 209, no. 1-4 (2009): 241–49. http://dx.doi.org/10.1007/s11270-009-0195-5.

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Agarwal, Nisha, Gurmukh Singh, and B. K. Kumbhar. "Modelling the Hydration kinetics of kidney beans (Phaseolus vulgaris) in sodium salts using Response surface methodology." Journal of Applied and Natural Science 12, no. 1 (2020): 42–52. http://dx.doi.org/10.31018/jans.v12i1.2234.

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The present work investigated the effect of salt solutions of sodium chloride, and sodium bicarbonate on the water uptake by kidney beans (Phaseolus vulgaris) at different temperatures (30, 45 and 60 0C). Thirty-five soaking solutions were prepared using NaCl and NaHCO3 to find the optimum soaking treatment and time to maximise the hydration. Hydration kinetics of kidney beans was studied in different concentrations of the salt solutions and at different temperatures by the method of weight gain until equilibrium conditions were attained. Response surface methodology was used to design the exp

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Qi, Ronghui, Chuanshuai Dong, Li-Zhi Zhang, Mingming Guo, and Lin Lu. "Modelling on space-domain surface waves of vertical low-Re falling film and the enhancement on mass transfer in halide-solution/air absorption." Chemical Engineering Science 215 (April 2020): 115459. http://dx.doi.org/10.1016/j.ces.2019.115459.

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Carvalho, M. G., V. S. Semia˜o, and P. J. Coelho. "Modelling and Optimization of the NO Formation in an Industrial Glass Furnace." Journal of Engineering for Industry 114, no. 4 (1992): 514–23. http://dx.doi.org/10.1115/1.2900706.

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The effects of combustion excess-air level, air preheating, and fuel composition on the nitric oxide emissions from an industrial glass furnace are studied through the use of a mathematical model. The mathematical model is based on the solution of the time-averaged form of the governing conservation equations for mass, momentum, energy, and chemical species. The k-ε turbulence model is employed for modelling the turbulence fluxes. The flame is modelled as a turbulent diffusion one and the chemical reactions associated with the heat release are assumed to be fast. The fluctuations of scalar pro

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Abdullah, Zalizawati, and Siti Norfasha Abu Bakar. "A Review on Empirical Modelling of CO₂ Solubility in Absorption Process." Advanced Materials Research 1113 (July 2015): 697–702. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.697.

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Carbon dioxide (CO2) is a major greenhouse gas that contributes to the global warming due to rise in temperature of the earth's atmosphere. Industrial activities such as fossil fuel combustion and production of several chemicals become one of the major contributors to CO2 emissions. This issue can be solved by providing improved technology to mitigate the carbon dioxide emissions. Absorption of CO2 in aqueous solution has been used extensively and has been proven to be the most applicable technology for CO2 capture. The effectiveness of absorption process is strongly depending on its hydrodyna

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Kazmi, Mohsin, Anwar R. Saleemi, Nadeem Feroze, Amir Yaqoob, and Syed Waqas Ahmad. "Removal of phenol from wastewater using activated waste tea leaves." Polish Journal of Chemical Technology 15, no. 2 (2013): 1–6. http://dx.doi.org/10.2478/pjct-2013-0016.

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This investigation enumerates the treatment of phenol contaminated synthetic wastewater by Activated Waste Tea Leaves (AWTL). Phosphoric acid was used for the modification of waste tea leaves. The effects of initial pH, biosorbent dose, contact time, and initial phenol concentration were studied on the phenol uptake from the synthetic solution. Kinetic modelling was performed using pseudo 1st and 2nd order kinetics. The Langmuir and Freundlich’s Models were employed to interpret the AWTL behaviour at various mass transfer gradients. The results show that the optimum values for pH, biosorbent d

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Bekbauov, B. E. "Acidizing Process in Acid Fracturing." Eurasian Chemico-Technological Journal 11, no. 2 (2016): 159. http://dx.doi.org/10.18321/ectj310.

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The theory and numerical implementation of acid-fracturing model that solves the 2D fracture geometry leakoff, acid transport and acid-rock reaction simultaneously will be presented. The mathematical model proovides a penetration distance for acid fracturing. Due to limitation of analytical solution, a finite-difference method was developed for modelling the fracture acidizing process. Example was solved for HCl reaction in limestone and dolomite fractures, and the results are presented in graphical form. The acid-transport model integrates a number of features which were not accounted for an

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Czerwiński, Grzegorz, and Jerzy Wołoszyn. "Numerical Study of a Cooling System Using Phase Change of a Refrigerant in a Thermosyphon." Energies 14, no. 12 (2021): 3634. http://dx.doi.org/10.3390/en14123634.

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With the increasing trend toward the miniaturization of electronic devices, the issue of heat dissipation becomes essential. The use of phase changes in a two-phase closed thermosyphon (TPCT) enables a significant reduction in the heat generated even at high temperatures. In this paper, we propose a modification of the evaporation–condensation model implemented in ANSYS Fluent. The modification was to manipulate the value of the mass transfer time relaxation parameter for evaporation and condensation. The developed model in the form of a UDF script allowed the introduction of additional source

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Nandeppanavar, Mahantesh M., M. C. Kemparaju, R. Madhusudhan, and S. Vaishali. "MHD slip flow and convective heat transfer due to a moving plate with effects of variable viscosity and thermal conductivity." Multidiscipline Modeling in Materials and Structures 16, no. 5 (2020): 991–1018. http://dx.doi.org/10.1108/mmms-08-2019-0142.

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PurposeThe steady two-dimensional laminar boundary layer flow, heat and mass transfer over a flat plate with convective surface heat flux was considered. The governing nonlinear partial differential equations were transformed into a system of nonlinear ordinary differential equations and then solved numerically by Runge–Kutta method with the most efficient shooting technique. Then, the effect of variable viscosity and variable thermal conductivity on the fluid flow with thermal radiation effects and viscous dissipation was studied. Velocity, temperature and concentration profiles respectively

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Freidoonimehr, Navid, Mohammad Mehdi Rashidi, Mohammad Hossein Momenpour, and Saman Rashidi. "Analytical approximation of heat and mass transfer in MHD non-Newtonian nanofluid flow over a stretching sheet with convective surface boundary conditions." International Journal of Biomathematics 10, no. 01 (2016): 1750008. http://dx.doi.org/10.1142/s1793524517500085.

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The paper provides an analytical investigation, homotopy analysis method (HAM), of the heat and mass transfer for magnetohydrodynamic Oldroyd-B nanofluid flow over a stretching sheet in the presence of convective boundary condition. The PDE governing equations, which consist of equations of continuity, momentum, energy and nanoparticles, are converted to ordinary differential equations using similarity transformations. The current HAM solution demonstrates very good correlation with those of the previously published studies in the special cases. The influences of different flow physical parame

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Jan Přikryl and Andri Stefánsson. "CO2 mineralization by olivine at hydrothermal conditions." Mineralogical Magazine 78, no. 6 (2014): 1473–77. http://dx.doi.org/10.1180/minmag.2014.078.6.14.

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The interaction of CO2-rich water with olivine was studied using geochemical reaction modelling in order to gain insight into the effects of temperature, acid supply (CO2) and extent of reaction on the secondary mineralogy, water chemistry and mass transfer. Olivine (Fo93) was dissolved at 150 and 250ºC and pCO2 of 2 and 20 bar in a closed system and an open system with secondary minerals allowed to precipitate. The progressive water–rock interaction resulted in increased solution pH, with gradual carbonate formation starting at pH 5 and various Mg-OH and Mg-Si minerals becoming dominant at pH

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