The current study explains the numerical simulation for the Darcy-Forchheimer (DF) hybrid nanofluid (HNF) flow over a permeable rotating disc. The HNF is prepared with the addition of AA7072 and AA7075 (aluminum alloys) nanoparticles (NPs) in water. Aluminum alloys are frequently used in aircraft parts like fuselages and wing flaps due to its light weight and durability. Additionally, making of M16 rifles for the American military is one intriguing application of the aluminum alloys. The fluid flow has been estimated with the significances of thermal radiation, DF effect, viscous dissipation, thermal slip condition and exponential heat source/sink. The modeled equations are simplified to ordinary system of differential equations (ODEs) by substituting similarity variables. The obtained set of equations is solved via using PCM (parametric continuation method). It has been noticed that the HNF both radial and axial velocity diminish with the upshot of porosity parameter and Darcy Forchheimer term. The velocity and temperature fields reduce with the rising numbers of aluminum alloys (AA7072 and AA7075).
{"title":"Numerical Simulation of 3D Darcy-Forchheimer Hybrid Nanofluid Flow with Heat Source/Sink and Partial Slip Effect across a Spinning Disc","authors":"Bilal Ali, Sidra Jubair, Md Irfanul Haque Siddiqui","doi":"10.1615/jpormedia.2024051759","DOIUrl":"https://doi.org/10.1615/jpormedia.2024051759","url":null,"abstract":"The current study explains the numerical simulation for the Darcy-Forchheimer (DF) hybrid nanofluid (HNF) flow over a permeable rotating disc. The HNF is prepared with the addition of AA7072 and AA7075 (aluminum alloys) nanoparticles (NPs) in water. Aluminum alloys are frequently used in aircraft parts like fuselages and wing flaps due to its light weight and durability. Additionally, making of M16 rifles for the American military is one intriguing application of the aluminum alloys. The fluid flow has been estimated with the significances of thermal radiation, DF effect, viscous dissipation, thermal slip condition and exponential heat source/sink. The modeled equations are simplified to ordinary system of differential equations (ODEs) by substituting similarity variables. The obtained set of equations is solved via using PCM (parametric continuation method). It has been noticed that the HNF both radial and axial velocity diminish with the upshot of porosity parameter and Darcy Forchheimer term. The velocity and temperature fields reduce with the rising numbers of aluminum alloys (AA7072 and AA7075).","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075634","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.2024052821
Pushap Sharma, Deepak Bains, G. C. Rana
The present paper investigates the effect of suspended particles on thermal convection in rotating Casson nanofluid saturating a Darcy-Brinkman porous medium which has various applications in different sectors, including those that process food, paint, water generators, electricity generators, hydrology and geophysics, heavily rely on rotation in thermal convection. With the aid of the Galerkin 1st approximation technique, the numerical examination is carried out. The Darcy-Brinkman porous media and particles suspension are taken into consideration throughout the conduct of this study. The non-Newtonian Casson nanofluid, Darcy-Brinkman porous medium, particle suspension and rotation parameter, their impact on thermal convection have been analysed and presented graphically for free-free, rigid-rigid and rigid-free boundaries. It is found that for all boundary conditions: the Casson nanofluid and suspended particle parameters have destabilising impact on the stationary convection whereas the parameter which occurred due to presence of rotation i.e. Taylor number and Brinkman porous medium parameters, they both delayed the stationary convection. In addition, we have discovered that for realistic rigid-rigid boundary condition, the system is determined to be more stable than for the other two boundary conditions. Also, on the basis of several approximations on the Taylor number and other parameters, the critical wave number and value for stationary convection are determined.
{"title":"ON THERMAL CONVECTION IN ROTATING CASSON NANOFLUID PERMEATED WITH SUSPENDED PARTICLES IN A DARCY-BRINKMAN POROUS MEDIUM","authors":"Pushap Sharma, Deepak Bains, G. C. Rana","doi":"10.1615/jpormedia.2024052821","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052821","url":null,"abstract":"The present paper investigates the effect of suspended particles on thermal convection in rotating Casson nanofluid saturating a Darcy-Brinkman porous medium which has various applications in different sectors, including those that process food, paint, water generators, electricity generators, hydrology and geophysics, heavily rely on rotation in thermal convection. With the aid of the Galerkin 1st approximation technique, the numerical examination is carried out. The Darcy-Brinkman porous media and particles suspension are taken into consideration throughout the conduct of this study. The non-Newtonian Casson nanofluid, Darcy-Brinkman porous medium, particle suspension and rotation parameter, their impact on thermal convection have been analysed and presented graphically for free-free, rigid-rigid and rigid-free boundaries. It is found that for all boundary conditions: the Casson nanofluid and suspended particle parameters have destabilising impact on the stationary convection whereas the parameter which occurred due to presence of rotation i.e. Taylor number and Brinkman porous medium parameters, they both delayed the stationary convection. In addition, we have discovered that for realistic rigid-rigid boundary condition, the system is determined to be more stable than for the other two boundary conditions. Also, on the basis of several approximations on the Taylor number and other parameters, the critical wave number and value for stationary convection are determined.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140196674","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.2024051926
Priya Bartwal, Himanshu Upreti, Alok Kumar Pandey
Melting heat transfer plays a crucial role in many industrial devices including heat exchangers, air-conditioning, and metal casting. Considering these uses, the heat transmission in three-dimensional tangent hyperbolic fluid flow is evaluated. The effects of magnetohydrodynamics, Ohmic heating, porous medium, and melting heat transfer at the boundary are applied to the stretching rotating disk. The governing equations are transformed into a non-dimensional form after applying similarity transformation. The simplified ODEs contain various dimensionless terms and the results of these variables are obtained by the bvp4c method. The graphical and tabular results for existing parameters are displayed. For the validation of our results, a comparison is done. From the outcomes, it is noticed that velocity and temperature profiles are enhanced with melting heat transfer at the boundary. The porosity term reduces the velocity of the rotating disk and the Eckert number demonstrates the dual nature of temperature profiles.
{"title":"Insight into the impact of melting heat transfer and MHD on stagnation point flow of tangent hyperbolic fluid over a porous rotating disk","authors":"Priya Bartwal, Himanshu Upreti, Alok Kumar Pandey","doi":"10.1615/jpormedia.2024051926","DOIUrl":"https://doi.org/10.1615/jpormedia.2024051926","url":null,"abstract":"Melting heat transfer plays a crucial role in many industrial devices including heat exchangers, air-conditioning, and metal casting. Considering these uses, the heat transmission in three-dimensional tangent hyperbolic fluid flow is evaluated. The effects of magnetohydrodynamics, Ohmic heating, porous medium, and melting heat transfer at the boundary are applied to the stretching rotating disk. The governing equations are transformed into a non-dimensional form after applying similarity transformation. The simplified ODEs contain various dimensionless terms and the results of these variables are obtained by the bvp4c method. The graphical and tabular results for existing parameters are displayed. For the validation of our results, a comparison is done. From the outcomes, it is noticed that velocity and temperature profiles are enhanced with melting heat transfer at the boundary. The porosity term reduces the velocity of the rotating disk and the Eckert number demonstrates the dual nature of temperature profiles.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124919","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.2024049715
Vanengmawia PC, Surender Ontela
An analytical investigation is conducted on Forced Convection in a parallel plate channel filled with a Bidisperse porous medium (BDPM). The flow and temperature fields are studied for both the fluid phase and solid phase using the two-velocity two-temperature model, taking into consideration the convective boundary condition at the channel walls and the momentum slip. The governing equations are non-dimensionalized and solved using the Homotopy Analysis Method (HAM) to determine the velocity and temperature profiles for both phases. The study reveals that the increase in temperature for the solid phase is significantly greater than that of the fluid phase. The effects of different parameters, including the Darcy number, Biot number, slip parameter, and Brinkman number, on the velocity, temperature, Nusselt number, and skin friction are also analyzed.
{"title":"Effects of Momentum Slip and Convective Boundary Condition on a Forced Convection in a Channel Filled with Bidisperse Porous Medium (BDPM)","authors":"Vanengmawia PC, Surender Ontela","doi":"10.1615/jpormedia.2024049715","DOIUrl":"https://doi.org/10.1615/jpormedia.2024049715","url":null,"abstract":"An analytical investigation is conducted on Forced Convection in a parallel plate channel filled with a Bidisperse porous medium (BDPM). The flow and temperature fields are studied for both the fluid phase and solid phase using the two-velocity two-temperature model, taking into consideration the convective boundary condition at the channel walls and the momentum slip. The governing equations are non-dimensionalized and solved using the Homotopy Analysis Method (HAM) to determine the velocity and temperature profiles for both phases. The study reveals that the increase in temperature for the solid phase is significantly greater than that of the fluid phase. The effects of different parameters, including the Darcy number, Biot number, slip parameter, and Brinkman number, on the velocity, temperature, Nusselt number, and skin friction are also analyzed.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140323417","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 : 2024-02-01DOI: 10.1615/jpormedia.2024052470
galal Moatimid, Mona Mohamed, Khaled Elagamy
This study anticipates examining a slip bio-convective movement of a non-Newtonian Sutterby nano-fluid (SF) layer with motile microorganisms. The fluid layer flows over a curved stretching surface. The movement is taken across a permeable medium and under the influence of thermal diffusion, diffusion thermo, an unchanged vertical magnetic field (MF), Joule heating, thermal radiation, and chemical reactions. The mathematical construction comprises momentum, energy, nanoparticles volume fraction, and microorganism concentration equations along with linear slip velocity and suitable boundary conditions (BCs). The motivation of the problem concerns recent progress in curved electronics and microchip technology which made a growing development to the remarkable disadvantages of traditional planar electronics, from which the importance of the current work stems. Furthermore, the implication of this work emerges from the participation of microorganisms in the flow over a curved surface and the equation that this flow shares with the temperature, velocity, and nanoparticle system of equations. This prototype has a considerable applicable role in some manufacturing and engineering mechanisms like conduits, sports balls, combustion, inflated broadcast, and flow-structure contact between hydrodynamics and aerodynamics. The configuration of nonlinear partial differential equations (PDEs) is converted into ordinary differential equations (ODEs) by consuming suitable symmetrical transformations. The resulting equations are numerically analyzed via the fourth-order Runge-Kutta (RK-4) in concurrence with the shooting technique. The graphical construction of the targeted distributions is
{"title":"SUTTERBY NANOFLUID FLOW WITH MICROORGANISMS AROUND A CURVED EXPANDING SURFACE THROUGH A POROUS MEDIUM: THERMAL DIFFUSION AND DIFFUSION THERMO IMPACTS","authors":"galal Moatimid, Mona Mohamed, Khaled Elagamy","doi":"10.1615/jpormedia.2024052470","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052470","url":null,"abstract":"This study anticipates examining a slip bio-convective movement of a non-Newtonian Sutterby nano-fluid (SF) layer with motile microorganisms. The fluid layer flows over a curved stretching surface. The movement is taken across a permeable medium and under the influence of thermal diffusion, diffusion thermo, an unchanged vertical magnetic field (MF), Joule heating, thermal radiation, and chemical reactions. The mathematical construction comprises momentum, energy, nanoparticles volume fraction, and microorganism concentration equations along with linear slip velocity and suitable boundary conditions (BCs). The motivation of the problem concerns recent progress in curved electronics and microchip technology which made a growing development to the remarkable disadvantages of traditional planar electronics, from which the importance of the current work stems. Furthermore, the implication of this work emerges from the participation of microorganisms in the flow over a curved surface and the equation that this flow shares with the temperature, velocity, and nanoparticle system of equations. This prototype has a considerable applicable role in some manufacturing and engineering mechanisms like conduits, sports balls, combustion, inflated broadcast, and flow-structure contact between hydrodynamics and aerodynamics. The configuration of nonlinear partial differential equations (PDEs) is converted into ordinary differential equations (ODEs) by consuming suitable symmetrical transformations. The resulting equations are numerically analyzed via the fourth-order Runge-Kutta (RK-4) in concurrence with the shooting technique. The graphical construction of the targeted distributions is","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766904","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 : 2024-02-01DOI: 10.1615/jpormedia.2024051280
Jun Yao, Chunqi Wang, Xiaoyu Wang, Zhaoqin Huang, Fugui Liu, Quan Xu, Yongfei Yang
In stress-sensitive oil and gas reservoirs, formation rocks’ deformation occurs under in-situ stress and pore pressure, affecting the rock's porosity and permeability. Pore deformation is the fundamental mechanism. However, the literature on the numerical simulation of rock porosity and permeability at the pore scale is rare. In this paper, a numerical simulation framwork of pore scale is proposed based on the discrete element method. The pore geometry and permeability evolution of the core are quantitatively analyzed by digital core method. Firstly, the CFM-DEM (Coupled fluid discrete element method) is used to simulate the samples’ deformation under different stress and pore pressures. Then, reconstruct the digital core using Avizo. Finally, the pore geometric topological structure are analyzed, and the permeability changes are calculated. The results show that stress can reduce porosity, modify pore shape, and lead to poor porosity connectivity and permeability, while pore pressure can weaken such trends.
{"title":"Pore structure and permeability behavior of porous media under in-situ stress and pore pressure: Discrete element method simulation on digital core","authors":"Jun Yao, Chunqi Wang, Xiaoyu Wang, Zhaoqin Huang, Fugui Liu, Quan Xu, Yongfei Yang","doi":"10.1615/jpormedia.2024051280","DOIUrl":"https://doi.org/10.1615/jpormedia.2024051280","url":null,"abstract":"In stress-sensitive oil and gas reservoirs, formation rocks’ deformation occurs under in-situ stress and pore pressure, affecting the rock's porosity and permeability. Pore deformation is the fundamental mechanism. However, the literature on the numerical simulation of rock porosity and permeability at the pore scale is rare. In this paper, a numerical simulation framwork of pore scale is proposed based on the discrete element method. The pore geometry and permeability evolution of the core are quantitatively analyzed by digital core method. Firstly, the CFM-DEM (Coupled fluid discrete element method) is used to simulate the samples’ deformation under different stress and pore pressures. Then, reconstruct the digital core using Avizo. Finally, the pore geometric topological structure are analyzed, and the permeability changes are calculated. The results show that stress can reduce porosity, modify pore shape, and lead to poor porosity connectivity and permeability, while pore pressure can weaken such trends.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139926935","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 : 2024-02-01DOI: 10.1615/jpormedia.2024025325
Yi Man, Mostafa Barzegar Gerdroodbary
Recently, the applications of nanofluid have been extensively increased in the chemical process due to its distinctive advantages in heat transfer. In the present study, numerical simulations have been conducted to investigate the effect of magnetic field on fluid flow and forced convection of the CuO-water nanofluid in a complex shaped lid driven cavity. This research considered Brownian motion effect on thermal conductivity of nanofluid and vorticity stream function formulation is applied. In order to solve final equations, control volume based finite element approach is applied. Comprehensive parametric studies on various factors such as Darcy number , CuO -water volume fraction , Reynolds and Hartmann numbers are performed to reveal all aspects of the effect of Lorentz force. Our findings showed that heat transfer process intensifies with rising of nanofluid volume fraction, Darcy and Reynolds number while it increases with augmenting of Hartmann number. Obtained results reveal that applying nanoparticles is more effective for higher values of Hartmann number and lower values of Darcy number.
{"title":"Influence of Lorentz forces on forced convection of Nanofluid in a porous lid driven enclosure","authors":"Yi Man, Mostafa Barzegar Gerdroodbary","doi":"10.1615/jpormedia.2024025325","DOIUrl":"https://doi.org/10.1615/jpormedia.2024025325","url":null,"abstract":"Recently, the applications of nanofluid have been extensively increased in the chemical process due to its distinctive advantages in heat transfer. In the present study, numerical simulations have been conducted to investigate the effect of magnetic field on fluid flow and forced convection of the CuO-water nanofluid in a complex shaped lid driven cavity. This research considered Brownian motion effect on thermal conductivity of nanofluid and vorticity stream function formulation is applied. In order to solve final equations, control volume based finite element approach is applied. Comprehensive parametric studies on various factors such as Darcy number , CuO -water volume fraction , Reynolds and Hartmann numbers are performed to reveal all aspects of the effect of Lorentz force. Our findings showed that heat transfer process intensifies with rising of nanofluid volume fraction, Darcy and Reynolds number while it increases with augmenting of Hartmann number. Obtained results reveal that applying nanoparticles is more effective for higher values of Hartmann number and lower values of Darcy number.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766911","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 : 2024-02-01DOI: 10.1615/jpormedia.2024052114
Kostas Davanas
Practically all properties of porous media (elastic moduli, thermal conductivity, electrical resistivity, etc.) are subject to potentially significant and non-linear variations w.r.t. the degree of their porosity. This may be due, among other reasons, to the pore-to-pore interactions which stem from the elastic fields arising from the applied stresses. The nature of these interactions is disputed – whether they are attractive or repulsive among the pores – thus hindering the estimations about such property variations. Herein, a numerical solution is provided, devoid of the shortcomings of the previous models, showing unequivocally that in an externally stressed material with equilibrium pores (i.e. pores non-exerting any stresses on the surrounding matrix), the aforementioned interactions are repulsive, and (approximately) inversely proportional to the 4th power of the inter-pore distance.
{"title":"ELASTIC INTERACTIONS BETWEEN EQUILIBRIUM PORES/HOLES IN POROUS MEDIA UNDER REMOTE STRESS","authors":"Kostas Davanas","doi":"10.1615/jpormedia.2024052114","DOIUrl":"https://doi.org/10.1615/jpormedia.2024052114","url":null,"abstract":"Practically all properties of porous media (elastic moduli, thermal conductivity, electrical resistivity, etc.) are subject to potentially significant and non-linear variations w.r.t. the degree of their porosity. This may be due, among other reasons, to the pore-to-pore interactions which stem from the elastic fields arising from the applied stresses. The nature of these interactions is disputed – whether they are attractive or repulsive among the pores – thus hindering the estimations about such property variations. Herein, a numerical solution is provided, devoid of the shortcomings of the previous models, showing unequivocally that in an externally stressed material with equilibrium pores (i.e. pores non-exerting any stresses on the surrounding matrix), the aforementioned interactions are repulsive, and (approximately) inversely proportional to the 4th power of the inter-pore distance.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139927119","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 : 2024-02-01DOI: 10.1615/jpormedia.2024047621
Heshani Manaweera Wickramage, Pan Lu, Peter Oduor, Jianbang Du
The transportation of hazardous materials (HAZMAT) has been challenging over the years due to the inherent environmental and associated health risks. To fully understand the potential environmental impacts of HAZMAT accidents, estimating the potential spread for various HAZMATs is needed for a complete risk assessment. We conducted diffusion tests on porous filter paper for four HAZMAT compounds —methanol, ethanol, hydrochloric acid, and sodium hydroxide—on unmodified α-cellulose filter paper using conservative (nonreacting) dye tracers. We determined spread area, time of diffusion, porosity, and retention factors among other properties. The analytes showed that the chemical dispersion properties are distinctly different. For example, the range of retention factors of ionic solutions, although similar for methanol and ethanol, was significantly different for hydrochloric acid and sodium hydroxide. Temperature also has an impact on dispersion properties. The diffusion area for sodium hydroxide increased in temperature while its viscosity decreased. All other analytes diffusion increased with increasing temperature. An analytical solution using an amplitude diffusing mass model was used to estimate the diffusion coefficients of each analyte. Using the derived diffusion coefficient values, a maximum spread model using Fick’s second law was used to countercheck the maximum spread rates. In this study, we were able to derive maximum spread areas, indicating that a finite element model developed was able to replicate analyte spread at various temperature settings.
{"title":"Estimating the Spreading Rates of Hazardous Materials on Unmodified Cellulose Filter Paper: Implications on Risk Assessment of Transporting Hazardous Materials","authors":"Heshani Manaweera Wickramage, Pan Lu, Peter Oduor, Jianbang Du","doi":"10.1615/jpormedia.2024047621","DOIUrl":"https://doi.org/10.1615/jpormedia.2024047621","url":null,"abstract":"The transportation of hazardous materials (HAZMAT) has been challenging over the years due to the inherent environmental and associated health risks. To fully understand the potential environmental impacts of HAZMAT accidents, estimating the potential spread for various HAZMATs is needed for a complete risk assessment. We conducted diffusion tests on porous filter paper for four HAZMAT compounds —methanol, ethanol, hydrochloric acid, and sodium hydroxide—on unmodified α-cellulose filter paper using conservative (nonreacting) dye tracers. We determined spread area, time of diffusion, porosity, and retention factors among other properties. The analytes showed that the chemical dispersion properties are distinctly different. For example, the range of retention factors of ionic solutions, although similar for methanol and ethanol, was significantly different for hydrochloric acid and sodium hydroxide. Temperature also has an impact on dispersion properties. The diffusion area for sodium hydroxide increased in temperature while its viscosity decreased. All other analytes diffusion increased with increasing temperature. An analytical solution using an amplitude diffusing mass model was used to estimate the diffusion coefficients of each analyte. Using the derived diffusion coefficient values, a maximum spread model using Fick’s second law was used to countercheck the maximum spread rates. In this study, we were able to derive maximum spread areas, indicating that a finite element model developed was able to replicate analyte spread at various temperature settings.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140004623","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 : 2024-02-01DOI: 10.1615/jpormedia.2024049514
Michael Kopp, Vladimir Yanovsky
The effect of gravity modulation on weakly nonlinear bio-thermal convection in a porous rotating layer has been investigated in this study. The system under consideration is a porous medium layer saturated with a Newtonian fluid containing gyrotactic microorganisms, and it is subjected to both gravity modulation and rotation. Through a weakly nonlinear analysis, the behavior of the system at finite amplitudes is studied. The Ginzburg-Landau equation, obtained from perturbation analysis, provides insights into the system's behavior in the presence of gravity modulation. The amplitude of convection in the unmodulated case is determined analytically, serving as a reference for comparison. The research explores the influence of various parameters on the system, including the Vadasz number, modified Rayleigh-Darcy number, Taylor number, cell eccentricity, and modulation parameters such as amplitude and frequency. By varying these parameters, the heat transfer, quantified by the Nusselt number, is analyzed and compared in different cases. The modulation amplitude is found to have a significant effect on enhancing heat transfer, while the modulation frequency has a diminishing effect.
{"title":"Gravity modulation and its impact on weakly nonlinear bio-thermal convection in a porous layer under rotation: a Ginzburg-Landau model approach","authors":"Michael Kopp, Vladimir Yanovsky","doi":"10.1615/jpormedia.2024049514","DOIUrl":"https://doi.org/10.1615/jpormedia.2024049514","url":null,"abstract":"The effect of gravity modulation on weakly nonlinear bio-thermal convection in a porous rotating layer has been investigated in this study. The system under consideration is a porous medium layer saturated with a Newtonian fluid containing gyrotactic microorganisms, and it is subjected to both gravity modulation and rotation. Through a weakly nonlinear analysis, the behavior of the system at finite amplitudes is studied. The Ginzburg-Landau equation, obtained from perturbation analysis, provides insights into the system's behavior in the presence of gravity modulation. The amplitude of convection in the unmodulated case is determined analytically, serving as a reference for comparison.\u0000The research explores the influence of various parameters on the system, including the Vadasz number, modified Rayleigh-Darcy number, Taylor number, cell eccentricity, and modulation parameters such as amplitude and frequency. By varying these parameters, the heat transfer, quantified by the Nusselt number, is analyzed and compared in different cases. The modulation amplitude is found to have a significant effect on enhancing heat transfer, while the modulation frequency has a diminishing effect.","PeriodicalId":50082,"journal":{"name":"Journal of Porous Media","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139926969","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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