Pub Date : 2024-04-01DOI: 10.1615/jpormedia.2024052406
Ahmed M. Rashad, Hossam Nabwey, Waqar A. Khan, Zeinab Abdelrahman, shereen abdelnaiem, Miad Abu Hawsah
This study investigates the flow of non-Newtonian Oldroyd-B and Jeffrey-Williamson ternary-hybrid nanofluids along a stretching sheet through a porous medium in the presence of a magnetic field. The nanofluid is composed of titanium oxide, aluminum oxide, and silver dispersed in water. The effects of local thermal non-equilibrium conditions are also considered. The mathematical model for this physical problem consists of a set of nonlinear partial differential equations with boundary conditions, which are solved numerically using MATLAB. The study analyzes the heat transfer properties and flow features under different flow parameters, and the results are presented in tabular form for the Nusselt number of the ternary-hybrid nanofluid and solid, the skin friction coefficient, and the Sherwood number. The numerical examination illustrates the impact of various governing factors on velocity, temperature, and concentration, and the findings are discussed in detail. It is concluded that Jeffrey-Williamson fluid exhibits lower skin friction, Nusselt, and Sherwood numbers compared to Oldroyd-B fluid, whereas the maximum value observed for ternary nanofluids. On the other hand, the base fluid shows the lowest skin friction, Nusselt, and Sherwood numbers among all types of nanofluids.
{"title":"Heat And Mass Transfer of Oldroyd-B And Jeffery-Williamson Ternary-Hybrid Nanofluids Over A Stretching Sheet In A Porous Medium","authors":"Ahmed M. Rashad, Hossam Nabwey, Waqar A. Khan, Zeinab Abdelrahman, shereen abdelnaiem, Miad Abu Hawsah","doi":"10.1615/jpormedia.2024052406","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052406","url":null,"abstract":"This study investigates the flow of non-Newtonian Oldroyd-B and Jeffrey-Williamson ternary-hybrid nanofluids along a stretching sheet through a porous medium in the presence of a magnetic field. The nanofluid is composed of titanium oxide, aluminum oxide, and silver dispersed in water. The effects of local thermal non-equilibrium conditions are also considered. The mathematical model for this physical problem consists of a set of nonlinear partial differential equations with boundary conditions, which are solved numerically using MATLAB. The study analyzes the heat transfer properties and flow features under different flow parameters, and the results are presented in tabular form for the Nusselt number of the ternary-hybrid nanofluid and solid, the skin friction coefficient, and the Sherwood number. The numerical examination illustrates the impact of various governing factors on velocity, temperature, and concentration, and the findings are discussed in detail. It is concluded that Jeffrey-Williamson fluid exhibits lower skin friction, Nusselt, and Sherwood numbers compared to Oldroyd-B fluid, whereas the maximum value observed for ternary nanofluids. On the other hand, the base fluid shows the lowest skin friction, Nusselt, and Sherwood numbers among all types of nanofluids.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"23 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1615/jpormedia.2024050425
Fatih Selimefendigil, Hakan Öztop
A unique technique for improving the performance of a thermoelectric generator (TEG) positioned between vented cavities is proposed. The method combines the effects of blade-shaped nanoparticles in the base fluid and corner porous partitions. The numerical study by using finite element method is conducted for different values of Darcy number of upper and lower cavity (10−6 ≤ Da1 ≤ 10−2 , 10−6 ≤ Da2 ≤ 10−2 ), opening ratio (SR between 0.5 and 2.5) and nanoparticle loading amount (SVF between 0 and 0.03). By adjusting the permeability of the partitions and opening ratio of the cavities, significant changes in the flow field can be obtained. TEG power increases with greater opening ratios and lower partition permeabilities. By changing the permeability, the TEG power can increase by up to 27.5 percent while increasing the opening ratio from SR=0.5 to SR=1 can increase the TEG power by up to 140 percent. Using blade-shaped nanoparticles results in additional improvements, with values of 32.7% at SR=0.5 and 20.26% at SR=2.5. Using 180 parametric computational fluid dynamics cases, a PODbased low-cost reconstruction model is created for the interface temperatures at the hot and cold sides using 5-POD modes. The approach enables quick computation of couped TEG- vented cavity systems with corner partitions and is applicable to other complex geometries where 3D computations are expensive.
{"title":"Impacts of using porous corner partitions and blade shaped nanoparticles in base fluid on the performance improvement of TEG mounted vented cavities and interface temperature estimation with POD","authors":"Fatih Selimefendigil, Hakan Öztop","doi":"10.1615/jpormedia.2024050425","DOIUrl":"https://doi.org/10.1615/jpormedia.2024050425","url":null,"abstract":"A unique technique for improving the performance of a thermoelectric\u0000generator (TEG) positioned between vented cavities is proposed. The method\u0000combines the effects of blade-shaped nanoparticles in the base fluid and cor\u0002ner porous partitions. The numerical study by using finite element method\u0000is conducted for different values of Darcy number of upper and lower cavity\u0000(10−6 ≤ Da1 ≤ 10−2\u0000, 10−6 ≤ Da2 ≤ 10−2\u0000), opening ratio (SR between 0.5\u0000and 2.5) and nanoparticle loading amount (SVF between 0 and 0.03). By\u0000adjusting the permeability of the partitions and opening ratio of the cavities,\u0000significant changes in the flow field can be obtained. TEG power increases\u0000with greater opening ratios and lower partition permeabilities. By chang\u0002ing the permeability, the TEG power can increase by up to 27.5 percent while increasing the opening ratio from SR=0.5 to SR=1 can increase the\u0000TEG power by up to 140 percent. Using blade-shaped nanoparticles results\u0000in additional improvements, with values of 32.7% at SR=0.5 and 20.26% at\u0000SR=2.5. Using 180 parametric computational fluid dynamics cases, a POD\u0002based low-cost reconstruction model is created for the interface temperatures\u0000at the hot and cold sides using 5-POD modes. The approach enables quick\u0000computation of couped TEG- vented cavity systems with corner partitions\u0000and is applicable to other complex geometries where 3D computations are\u0000expensive.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"20 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140802009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1615/jpormedia.2024049572
Nosheen Zareen Khan, A. M Siddiqui, Mostafa Zahri
ABSTRACT Flow dynamics in nephritis have gained much attention in applied mathematics. In the present article, an extracellular steady Newtonian fluid flow with linear absorption at walls is discussed. A mathematical model is made to discuss the flow through nephritis in rats under different conditions. A nephrotoxic serum is injected in the nephritis of rats, which affects the flow rate Q_o, Velocity profile, trans-glomerular pressure gradient, and wall shear at different positions in the nephritis. The designed problem is highly non-linear and not possible to find the exact solution, so an Adomian Decomposition method is used to find an approximate solution and discussed graphically. Moreover, the flow rate causes some contraction near the wall, but re-absorption directly affects the velocity irrespective of the position and contributes to the pressure drop which naturally helps to make the flow moderate to normal when a nephrotoxic serum is injected, and the flow rate directly affects the shear stress.
{"title":"Steady Newtonian fluid flow in nephritis with linear dripping at the walls","authors":"Nosheen Zareen Khan, A. M Siddiqui, Mostafa Zahri","doi":"10.1615/jpormedia.2024049572","DOIUrl":"https://doi.org/10.1615/jpormedia.2024049572","url":null,"abstract":"ABSTRACT\u0000Flow dynamics in nephritis have gained much attention in applied mathematics. In the present article, an extracellular steady Newtonian fluid flow with linear absorption at walls is discussed. A mathematical model is made to discuss the flow through nephritis in rats under different conditions. A nephrotoxic serum is injected in the nephritis of rats, which affects the flow rate Q_o, Velocity profile, trans-glomerular pressure gradient, and wall shear at different positions in the nephritis. The designed problem is highly non-linear and not possible to find the exact solution, so an Adomian Decomposition method is used to find an approximate solution and discussed graphically. Moreover, the flow rate causes some contraction near the wall, but re-absorption directly affects the velocity irrespective of the position and contributes to the pressure drop which naturally helps to make the flow moderate to normal when a nephrotoxic serum is injected, and the flow rate directly affects the shear stress.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"25 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140575900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In carbonate gas reservoirs, water in aquifers can flow into reservoirs through high-permeable fractures, which leads to aqueous phase trapping and reduces well productivity. To investigate the mechanism of aqueous phase trapping, this paper established a mathematical model of aqueous phase trapping resistance at the pore scale, which takes capillary pressure, gas viscous force and water viscous force into account. The model was used to analyze the aqueous phase trapping resistance in a carbonate gas reservoir of the Sichuan Basin. Results show that gas flow resistance in matrix easily exceeds the water flow resistance in fracture. Water in fracture occupies the flow path in the formation and locks gas inside matrix. Consequently, aqueous phase trapping occurs. The aqueous phase trapping resistance is influenced by a series of factors i.e. pore radius, throat radius, flow velocity, fracture width, etc. The gas flow resistance is mainly affected by throat radius, because the capillary pressure accounts for more than 98% of the gas phase flow resistance. When the throat radius increases from 0.1μm to 10μm, the gas flow resistance decreases by 89.99%. The water flow resistance is mainly influenced by fracture width and flow velocity. The water flow resistance has a linear relationship with the flow velocity. Water flow resistance is also sensitive to fracture width. When the fracture width rises from 0.2μm to 1μm, the water flow resistance diminishes by 96.00%.
{"title":"Pore-scale Analysis of Aqueous Phase Trapping Resistance in Carbonate Gas Reservoirs","authors":"Wenting Fu, Fei Mo, Zhilin Qi, Xiaoliang Huang, Wende Yan, Wanliang Zhang","doi":"10.1615/jpormedia.2024052284","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052284","url":null,"abstract":"In carbonate gas reservoirs, water in aquifers can flow into reservoirs through high-permeable fractures, which leads to aqueous phase trapping and reduces well productivity. To investigate the mechanism of aqueous phase trapping, this paper established a mathematical model of aqueous phase trapping resistance at the pore scale, which takes capillary pressure, gas viscous force and water viscous force into account. The model was used to analyze the aqueous phase trapping resistance in a carbonate gas reservoir of the Sichuan Basin. Results show that gas flow resistance in matrix easily exceeds the water flow resistance in fracture. Water in fracture occupies the flow path in the formation and locks gas inside matrix. Consequently, aqueous phase trapping occurs. The aqueous phase trapping resistance is influenced by a series of factors i.e. pore radius, throat radius, flow velocity, fracture width, etc. The gas flow resistance is mainly affected by throat radius, because the capillary pressure accounts for more than 98% of the gas phase flow resistance. When the throat radius increases from 0.1μm to 10μm, the gas flow resistance decreases by 89.99%. The water flow resistance is mainly influenced by fracture width and flow velocity. The water flow resistance has a linear relationship with the flow velocity. Water flow resistance is also sensitive to fracture width. When the fracture width rises from 0.2μm to 1μm, the water flow resistance diminishes by 96.00%.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"11 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140838337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1615/jpormedia.2024052071
Na Zhang, Shuaidong Wang, Xinyue Wang, Hao Wang, Can Huang, Zheng Li
Studying the behavior of gaseous water adsorption and desorption in shale has significant theoretical and practical importance for exploring the micro-scale distribution of water and gas in shale reservoirs and deepening our insight of the mechanisms behind shale gas accumulation. Under 20-40°C conditions, isotherms and kinetic curves of gaseous water adsorption-desorption were tested in shale samples with a particle size of 60-80 mesh. Furthermore, the hysteresis behavior of gaseous water adsorption-desorption in shale was analyzed. Three different isotherm models and four adsorption kinetic models were used to explain how gaseous water adsorbed in shale. The results indicate that the Dent and bi-Langmuir kinetic models were the most suitable models for isotherm adsorption and adsorption kinetics, respectively. This suggests that the adsorption of gaseous water in shale follows a physical adsorption process from monolayer adsorption to multilayer adsorption and then to capillary condensation. Furthermore, this process is a first-order, two-stage kinetic process controlled by internal pore diffusion. The uncompleted adsorption-desorption hysteresis behavior is chiefly attributed to the difficulty of clay-bound water and cation-bound water to release at the experimental temperature. In addition, this study analyzed thermodynamic parameters, including ΔG, ΔH, and ΔS, and found that the adsorption behavior of gaseous water in shale is a spontaneous, exothermic process with a decrease in entropy. The study's conclusions serve as a foundation for reference for realizing the distribution patterns of gas and water in the Nimrat Shale, as well as the flow behavior of shale ga
{"title":"Study on Adsorption-desorption Characteristics and Mechanism of Gaseous Water in Shale","authors":"Na Zhang, Shuaidong Wang, Xinyue Wang, Hao Wang, Can Huang, Zheng Li","doi":"10.1615/jpormedia.2024052071","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052071","url":null,"abstract":"Studying the behavior of gaseous water adsorption and desorption in shale has significant theoretical and practical importance for exploring the micro-scale distribution of water and gas in shale reservoirs and deepening our insight of the mechanisms behind shale gas accumulation. Under 20-40°C conditions, isotherms and kinetic curves of gaseous water adsorption-desorption were tested in shale samples with a particle size of 60-80 mesh. Furthermore, the hysteresis behavior of gaseous water adsorption-desorption in shale was analyzed. Three different isotherm models and four adsorption kinetic models were used to explain how gaseous water adsorbed in shale. The results indicate that the Dent and bi-Langmuir kinetic models were the most suitable models for isotherm adsorption and adsorption kinetics, respectively. This suggests that the adsorption of gaseous water in shale follows a physical adsorption process from monolayer adsorption to multilayer adsorption and then to capillary condensation. Furthermore, this process is a first-order, two-stage kinetic process controlled by internal pore diffusion. The uncompleted adsorption-desorption hysteresis behavior is chiefly attributed to the difficulty of clay-bound water and cation-bound water to release at the experimental temperature. In addition, this study analyzed thermodynamic parameters, including ΔG, ΔH, and ΔS, and found that the adsorption behavior of gaseous water in shale is a spontaneous, exothermic process with a decrease in entropy. The study's conclusions serve as a foundation for reference for realizing the distribution patterns of gas and water in the Nimrat Shale, as well as the flow behavior of shale ga","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"34 3 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents a study of the drying kinetics of a porous mixture of biofuel based on the solid residue of peat after extraction and corn stalks. Experiments were performed on a convective drying stand. The effect of temperature on the duration of drying was determined. As the temperature rises, the drying process intensifies. Effective modes of drying the porous mixture of biofuel have been determined. The most adequate model was chosen for numerical simulation. A comparison of the obtained numerical results with our own experimental data showed a sufficient coincidence. The difference does not exceed 3% in temperature and 4% in humidity. The obtained results indicate that the selected model allows numerical calculations of the dehydration of porous media with sufficient accuracy.
{"title":"EXPERIMENTAL AND THEORETICAL STUDY OF DRYING OF POROUS BIOFUEL MIXTURE","authors":"Yury Snezhkin, Andrii Avramenko, Zhanna Petrova, Andrii Tyrinov, Anton Petrov, Yuliia Novikova","doi":"10.1615/jpormedia.2024052250","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052250","url":null,"abstract":"The paper presents a study of the drying kinetics of a porous mixture of biofuel based on the solid residue of peat after extraction and corn stalks. Experiments were performed on a convective drying stand. The effect of temperature on the duration of drying was determined. As the temperature rises, the drying process intensifies. Effective modes of drying the porous mixture of biofuel have been determined.\u0000The most adequate model was chosen for numerical simulation. A comparison of the obtained numerical results with our own experimental data showed a sufficient coincidence. The difference does not exceed 3% in temperature and 4% in humidity.\u0000The obtained results indicate that the selected model allows numerical calculations of the dehydration of porous media with sufficient accuracy.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"21 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-01DOI: 10.1615/jpormedia.2024051144
G. Shiva Kumar Reddy, Ravi Ragoju, Anjanna Matta, N. Keerthi Reddy, Dhananjay Yadav
This article focuses on the initiation of dissolution-driven convection in an inclined porous layer and explores the influence of several important control parameters, including the inclination angle, Damkohler number, and Rayleigh number. Our investigation reveals that the boundaries of nonlinear stability and linear instability do not align, indicating that different behaviors occur in these regions of parameter space. As the inclination angle increases, the subcritical instability region expands, indicating a wider range of conditions where subcritical instability can occur. Moreover, transverse rolls demonstrate greater stability when compared to longitudinal rolls, highlighting the significant impact of convection pattern orientation on stability. Additionally, both the Damkohler number and inclination angle have stabilizing effects on the system, contributing to increased stability and a reduction in subcritical instability.
{"title":"Dissolution-driven convection in an inclined porous medium with first order chemical reaction","authors":"G. Shiva Kumar Reddy, Ravi Ragoju, Anjanna Matta, N. Keerthi Reddy, Dhananjay Yadav","doi":"10.1615/jpormedia.2024051144","DOIUrl":"https://doi.org/10.1615/jpormedia.2024051144","url":null,"abstract":"This article focuses on the initiation of dissolution-driven convection in an inclined porous layer and explores the influence of several important control parameters, including the inclination angle, Damkohler number, and Rayleigh number. Our investigation reveals that the boundaries of nonlinear stability and linear instability do not align, indicating that different behaviors occur in these regions of parameter space. As the inclination angle increases, the subcritical instability region expands, indicating a wider range of conditions where subcritical instability can occur. Moreover, transverse\u0000rolls demonstrate greater stability when compared to longitudinal rolls, highlighting the significant impact of convection pattern orientation on stability. Additionally, both the Damkohler number and inclination angle have stabilizing effects on the system, contributing to increased stability and a reduction in subcritical instability.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"29 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1615/jpormedia.2024052053
Masood Moghaddam, Abbas Abbassi, Jafar Ghazanfarian
In this paper, the pore network model to investigate the reaction-diffusion process in the hierarchically structured porous catalyst particle is extended to consider the phenomenon of deactivation by coking. In this framework, the interaction of internal particle pore structure and mass transfer under the condition of coke deposition are examined. Then, the effect of structural features namely macroporosity and pore size ratio, the deactivation properties, the maximum loading of coke as well as the transport properties, the pore Damk¨ohler number on the net reaction rate and deactivation of the particle have been investigated. Three deactivation mechanisms are accounted for, namely, the site coverage, the pore narrowing, and the pore blockage. It is found that the deactivation of the catalyst particle can be divided into two conditions: the kinetic deactivation and the structural deactivation. It is shown that depending on the Damk¨ohler number, increasing the macroporosity does not necessarily improve the reactivity and deactivation resistance of the catalyst. The key finding of this work is to demonstrate and quantify how changing the typical fresh catalyst microstructure into a hierarchical one influences the reactivity and deactivation.
{"title":"Effect of Microstructures on Mass Transfer inside a Hierarchically-structured Porous Catalyst","authors":"Masood Moghaddam, Abbas Abbassi, Jafar Ghazanfarian","doi":"10.1615/jpormedia.2024052053","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052053","url":null,"abstract":"In this paper, the pore network model to investigate the reaction-diffusion process in the hierarchically structured porous catalyst particle is extended to consider the phenomenon of deactivation by coking. In this framework, the interaction of internal particle pore structure and mass transfer under the condition of coke deposition are examined. Then, the effect of structural features namely macroporosity and pore size ratio, the deactivation properties, the maximum loading of coke as well as the transport properties, the pore Damk¨ohler number on the net reaction rate and deactivation of the particle have been investigated. Three deactivation mechanisms are accounted for, namely, the site coverage, the pore narrowing, and the pore blockage. It is found that the deactivation of the catalyst particle can be divided into two conditions: the kinetic deactivation and the structural deactivation. It is shown that depending on the Damk¨ohler number, increasing the macroporosity does not necessarily improve the reactivity and deactivation resistance of the catalyst. The key finding of this work is to demonstrate and quantify how changing the typical fresh catalyst microstructure into a hierarchical one influences the reactivity and deactivation.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"5 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140152132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1615/jpormedia.2024051939
Bilal Ali, Shengjun Liu, Hongjuan Liu
The Levenberg-Marquardt back propagation artificial neural networks (LM-BP-ANNs) procedure is used in this analysis to show the computational strategy of neural networks for the simulation of MHD Tangent hyperbolic nanofluid (THNF). The THNF flow comprised of motile microorganism has been considered across a vertical slender stretching surface. The fluid flow has been examined under the significance of chemical reaction, magnetic field, activation energy, and heat source. The modeled equations are simplified to the ordinary system of differential equations using similarity variables substitution. The Lobatto IIIA formula based on the finite difference method (FDM) is employed for the nano liquid flow problem with an accuracy up to 5 decimal points. The robustness of Lobatto IIIA is its straightforward executing of very nonlinear coupled differential equations. The outcomes of FDM are manipulated to set up the reference datasets for LM-BP-ANNs technique. Several operations involves testing, authentication, and training are carried out by developing a scheme for different fluid problem elements using reference datasets. The accurateness of LM-BP-ANNs is tested through mean square error, error histogram, curve fitting figures and regression plot. Moreover, the examination of flow model factors for concentration, mass and momentum outlines are expressed through graphs.
{"title":"Application of Artificial Neural Network for Modeling of Motile Microorganism-Enhanced MHD Tangent Hyperbolic Nanofluid across a vertical Slender Stretching Surface","authors":"Bilal Ali, Shengjun Liu, Hongjuan Liu","doi":"10.1615/jpormedia.2024051939","DOIUrl":"https://doi.org/10.1615/jpormedia.2024051939","url":null,"abstract":"The Levenberg-Marquardt back propagation artificial neural networks (LM-BP-ANNs) procedure is used in this analysis to show the computational strategy of neural networks for the simulation of MHD Tangent hyperbolic nanofluid (THNF). The THNF flow comprised of motile microorganism has been considered across a vertical slender stretching surface. The fluid flow has been examined under the significance of chemical reaction, magnetic field, activation energy, and heat source. The modeled equations are simplified to the ordinary system of differential equations using similarity variables substitution. The Lobatto IIIA formula based on the finite difference method (FDM) is employed for the nano liquid flow problem with an accuracy up to 5 decimal points. The robustness of Lobatto IIIA is its straightforward executing of very nonlinear coupled differential equations. The outcomes of FDM are manipulated to set up the reference datasets for LM-BP-ANNs technique. Several operations involves testing, authentication, and training are carried out by developing a scheme for different fluid problem elements using reference datasets. The accurateness of LM-BP-ANNs is tested through mean square error, error histogram, curve fitting figures and regression plot. Moreover, the examination of flow model factors for concentration, mass and momentum outlines are expressed through graphs.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"260 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140020133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To discuss the influencing factors of thermal transport features in coarse fracture networks, the heat transfer analysis model of solid-liquid two-phase flow in a rough fracture network is created in this text. By calculating the thermal resistance and thermal conductivity of rough cracks, it was found that the thermal transport capacity of cracks is inversely proportional to relative roughness and porosity, and it is directly proportional to the ratio of solid-liquid thermal conductivity and Fractal dimension. Compared with other models and existing experimental data, it is concluded that the heat transfer capacity of dual media is stronger than that of the single porous medium. Finally, the percentage of thermal conductivity in the total thermal conductivity of the three parts was compared, and it was found that the strength of thermal transport mainly depends on the heat transfer ability of the matrix, because the solid thermal conductivity is much greater than the liquid thermal conductivity, so the thermal transport ability of the matrix is stronger than that of cracks and pores.
{"title":"Fractal model of solid-liquid two-phase thermal transport characteristics in the rough fracture network","authors":"shanshan yang, Qiong Sheng, Mingqing Zou, Mengying Wang, Ruike Cui, Shuaiyin Chen, Qian Zheng","doi":"10.1615/jpormedia.2024052146","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052146","url":null,"abstract":"To discuss the influencing factors of thermal transport features in coarse fracture networks, the heat transfer analysis model of solid-liquid two-phase flow in a rough fracture network is created in this text. By calculating the thermal resistance and thermal conductivity of rough cracks, it was found that the thermal transport capacity of cracks is inversely proportional to relative roughness and porosity, and it is directly proportional to the ratio of solid-liquid thermal conductivity and Fractal dimension. Compared with other models and existing experimental data, it is concluded that the heat transfer capacity of dual media is stronger than that of the single porous medium. Finally, the percentage of thermal conductivity in the total thermal conductivity of the three parts was compared, and it was found that the strength of thermal transport mainly depends on the heat transfer ability of the matrix, because the solid thermal conductivity is much greater than the liquid thermal conductivity, so the thermal transport ability of the matrix is stronger than that of cracks and pores.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":"11 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140047571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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