Relevant bibliographies by topics / Porous jump

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Porous jump'

Author: Grafiati
Published: 28 June 2021
Last updated: 29 July 2025

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Journal articles on the topic "Porous jump"

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Li, Hong Hai, and Yang Yang Cheng. "Effect of Porous-Jump Model Parameters on Membrane Flux Prediction." Advanced Materials Research 734-737 (August 2013): 2210–13. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2210.

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A three-dimensional computational fluid dynamics (CFD) simulation was performed to study the velocity distribution on membrane surface in membrane separation process, and the effect of face permeability, porous medium thickness, and pressure-jump coefficient of porous-jump model on membrane flux. The study shows that all the three factors have important impact on membrane flux. Membrane flux increases linearly with the increase of face permeability. When the membrane thickness is between 0.04~0.1mm, the membrane flux decreases with the increase of membrane thickness. The membrane flux decrease
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Avramenko, A. A., N. P. Dmitrenko, Yu Yu Kovetska, and E. A. Kondratieva. "FEATURES OF HEAT TRANSFER IN A FLAT POROUS MICROCHANNEL." Thermophysics and Thermal Power Engineering 42, no. 1 (2020): 12–18. http://dx.doi.org/10.31472/ttpe.1.2020.1.

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A steady heat transfer process of mixed convection in a flat vertical porous microchannel is considered.
 The results of simulation showed that Knudsen number effects are more significant in the neighborhood of the wall where growth of Knudsen numbers is accompanied with the velocity and temperature jumps on wall. With increasing parameter of porosity M (decreasing permeability), the flow velocity decreases and the velocity jump decrease as well.
 For all combinations of the criteria Ra, Kn and M increasing Knudsen number reduces heat transfer intensity. This can be attributed to inc
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Qiu, Li, Xiao-Dong Chen, Rui Wang, and De-Peng Wang. "Macro fluid analysis of laminated fabric permeability." Thermal Science 20, no. 3 (2016): 835–38. http://dx.doi.org/10.2298/tsci1603835q.

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A porous jump model is put forward to predict the breathability of laminated fabrics by utilizing fluent software. To simplify the parameter setting process, the methods of determining the parameters of jump porous model by means of fabric layers are studied. Also, effects of single/multi-layer fabrics and thickness on breathability are analyzed, indicating that fabric breathability reduces with the increase of layers. Multi-layer fabric is simplified into a single layer, and the fabric permeability is calculated by proportion. Moreover, the change curve of fabric layer and face permeability,
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Chen, Ming-Da, and Wang-Long Li. "Creeping Flow Relative to a Porous Spherical Shell." Journal of Mechanics 16, no. 3 (2000): 137–43. http://dx.doi.org/10.1017/s1727719100001799.

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ABSTRACTIn this study, the problem of creeping flow relative to an isolated porous spherical shell has been examined. The Brinkman-extended Darcy equations and the Stokes' equations are utilized to model the flow in the porous region (shell region) and free fluid region (inside the core and outside the shell), respectively. The stress jump boundary conditions at the porous media/free fluid interfaces are included and the exact solution has been found. The drag experienced by the porous shell has been discussed for various jump parameters and shell thickness.
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Djunur, Lutfi Hair, Muhammad S. Pallu, Riswal Karamma, and Bambang Bakri. "Effect of Porous Rectangular Type Baffle Block Angle on Hydraulic Jump Downstream of Spillway." Civil Engineering Journal 10, no. 10 (2024): 3173–93. http://dx.doi.org/10.28991/cej-2024-010-10-04.

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The elevation of the water surface upstream of the spillway structure increases significantly due to damming, leading to a rapid, supercritical flow downstream. This flow transitions from supercritical to subcritical, resulting in hydraulic jumps (Lj). The placement of a porous rectangular baffle block in the chute acts as an energy dissipator within the channel. This study aimed to investigate the effect of the angle of the porous rectangular baffle block on energy dissipation and hydraulic jumps downstream of the spillway structure. The experiment utilized a two-dimensional (2D) approach to
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Liu, Fang, and Bao Ming Chen. "Natural Convection in a Cavity Partially Filled with a Vertical Porous Medium." Advanced Materials Research 321 (August 2011): 15–18. http://dx.doi.org/10.4028/www.scientific.net/amr.321.15.

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The shear stress jump boundary condition that must be imposed at an interface between a porous medium and a free fluid in an enclosure is investigated. Two-domain approach is founded and finite element method is used to solve the problem. Three stress jump coefficients 0, 1, -1 are analyzed for different Rayleigh number, permeability and thickness of porous layer. Variation of Maximum stream function and Nusselt number show stronger convection and heat transfer when the stress jump coefficient is positive. There is little distinctive in flow and heat transfer when the value of coefficient is e
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Li, Wang-Long. "Derivation of Modified Reynolds Equation—A Porous Media Model." Journal of Tribology 121, no. 4 (1999): 823–29. http://dx.doi.org/10.1115/1.2834141.

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In this study, a porous media model is developed which can be applied to thin film lubrication problems. The microstructure of bearing surfaces is modeled as porous layers attached to the impermeable substrate. The Brinkman-extended Darcy equations and Stokes’ equations are utilized to model the flow in the porous region and fluid film region, respectively. The stress jump boundary condition at the porous media/fluid film interface and effects of viscous shear are included in deriving the modified Reynolds equation. The present model can correct and modify a previous study based on the Darcy m
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Angot, Philippe. "Well-posed Stokes/Brinkman and Stokes/Darcy coupling revisited with new jump interface conditions." ESAIM: Mathematical Modelling and Numerical Analysis 52, no. 5 (2018): 1875–911. http://dx.doi.org/10.1051/m2an/2017060.

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The global well-posedness in time is proved, with no restriction on the size of the data, for the Stokes/Brinkman and Stokes/Darcy coupled flow problems with new jump interface conditions recently derived by Angot et al. [Phys. Rev. E 95 (2017) 063302-1–063302-16] using asymptotic modelling and shown to be physically relevant. These original conditions include jumps of both stress and tangential velocity vectors at the fluid–porous interface. They can be viewed as generalizations for the multi-dimensional flow of Beavers and Joseph’s jump condition of tangential velocity and Ochoa-Tapia and Wh
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Zakirov, Timur R., and Maxim G. Khramchenkov. "Pore-scale investigation of the displacement fluid mechanics during two-phase flows in natural porous media under the dominance of capillary forces." Georesursy 22, no. 1 (2020): 4–12. http://dx.doi.org/10.18599/grs.2020.1.4-12.

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This paper presents the results of numerical simulations of two-phase flows in porous media under capillary forces dominance. For modeling of immiscible two-phase flow, the lattice Boltzmann equations with multi relaxation time operator were applied, and the interface phenomena was described with the color-gradient method. The objective of study is to establish direct links between quantitative characteristics of the flow and invasion events, using high temporal resolution when detecting simulation results. This is one of the few works where Haines jumps (rapid invasion event which occurs at m
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Zhanabaev, Z. Zh. "WIDTH OF ENERGY BAND GAP OF NANOPOROUS SEMICONDUCTOR FILMS." Eurasian Physical Technical Journal 17, no. 2 (2020): 39–44. http://dx.doi.org/10.31489/2020no2/39-44.

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The aim of this work is to experimentally clarify the reasons for the appearance of jumps in the current and memory of semiconductor nanoporous structures.Porous nanostructures were obtained by electrochemical etching. The current-voltage characteristics of the samples were measured for porous silicon and on thin films of a chalcogenide glassy semiconductor. The existence of jump-like switching and current hysteresis in porous silicon nanofilms under laser illumination is shown experimentally.A connection between the switching voltage values and the dependence of the band gap on the porosity o
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Dissertations / Theses on the topic "Porous jump"

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Shin, Youn-Ok 1971. "Vapor and liquid equilibria in porous media." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21323.

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The alteration of the vapor and liquid equilibrium (VLE) of volatile organic mixtures by using porous media at the liquid-vapor interface was studied. Kelvin, assuming ideal behavior of fluids, first introduced the vapor pressure of liquid over a meniscus as a function of its surface tension and the radius of the curvature. A thermodynamic model (SSmod model) predicting the VLE of non-ideal organic mixtures in porous media was developed as a function of pore sizes based on the pressure equations available in literature. The model was used to predict the VLE of two aqueous alcohol solutions, et
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Khan, Zafar Hayat. "Modelling moving evaporation fronts in porous media." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=16850.

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Understanding vertical heat transfer and through flow in porous media such as geothermal reservoirs is of great interest. In a geothermal system, a denser layer of liquid water may overlie a less dense layer of water vapour. Vertical and horizontal thermal diffusion stabilises such configurations, but the buoyancy contrast can cause instability. In this study, the mechanisms contributing to the stability and instability of such systems are analysed using a separate-phase model with a sharp interface be- tween liquid and vapour. The governing equations representing incompressibility, Darcy’s la
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Makris, Aristidis. "The propagation of gaseous detonations in porous media." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41700.

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The propagation of a gaseous detonation wave into a porous medium has been studied experimentally and theoretically. The porous medium is composed of inert spheres of equal diameter contained within a detonation tube. The propagation mechanisms were elucidated by means of high-speed Schlieren and open shutter photography of the wave-particle interactions in 2-D obstacle arrays, to simulate the phenomenon in actual porous media. It is found that a Chapman-Jouguet (CJ) detonation can transmit into a porous medium filled with detonable gas and continue to propagate as a quasi-steady combustion wa
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Foroutan, Rana. "Intake shape factors for transversely isotropic porous media." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29536.

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The study of flow of water through porous medium is important in geotechnical and geoenvironmental engineering. For determining the in situ hydraulic conductivity characteristics of porous media, one of the most convenient and popular methods is the cased borehole technique. In this method, water is allowed to enter the excavated region of the cased borehole inserted into the ground. The rate of rise of water in the casing is then used to estimate the hydraulic conductivity characteristics of the porous medium in the vicinity of the entry point. When the porous medium has isotropic hydraulic c
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Narayan, Shankar B. "Measurement of diffusion and adsorption in porous adsorbents." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73968.

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Galbraith, Graham H. "Heat and mass transfer within porous building materials." Thesis, University of Strathclyde, 1992. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21508.

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The thermal and structural performance of building elements can be significantly impaired by the presence of excess moisture. At present, designers have available only simplistic steady-state techniques to predict such effects, for example that presented by Glaser in 1959. These simple models recognise moisture transport in vapour form only and do not allow information on material moisture content to be obtained directly. They are also based on the assumption that the material transport properties are independent of the prevailing environmental conditions, whereas they are in fact complex func
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Corson, Lindsey Thomson. "Geochemical effects on natural convection in porous media." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18197.

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We describe a model of buoyancy-driven flow in a saturated reactive porous medium, the porosity and permeability of which evolve through precipitation and dissolution as a mineral is lost or gained from the pore fluid. We consider two scenarios: convection driven solely by solutally induced buoyancy effects with a vertically varying equilibrium solubility, and convection driven by a combination of thermally and solutally induced buoyancy effects where the solubility of the dissolved component depends on the temperature. In both cases we characterise the onset of convection using linear stabili
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McKenzie, Kimberly. "Skeletal distribution of bisphosphonate after elution from porous implants." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86584.

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Skeletal attachment to an implant can be enhanced by locally delivering the bisphosphonate zoledronic acid from an implant. The purpose of this study was to map the skeletal distribution of locally delivered zoledronic acid.<br>A porous tantalum implant coated with hydroxyapatite and 14C-labelled zoledronic acid was implanted into the left femur of three dogs. After one year bone samples were taken from sites near to and distant from the implant. The amount of drug in each sample was determined using liquid scintillation counting and its distribution in peri-implant bone was additionally demon
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Burel, Thomas. "Investigation of smooth contact angle treatment in porous media." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30826.

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Some of the key challenges faced in the oil/gas extraction and carbon dioxide injection/storage processes are the presence of complex geometries and the significant effect of the capillary forces which arise at low capillary numbers. Therefore, the contact angle needs to be carefully treated. Mesoscopic techniques such as lattice Boltzmann methods are capable of dealing with lower capillary numbers as compared to the Navier-Stokes solvers, which can also implicitly capture the interface between two fluids. To investigate immiscible two-phase ows at low Reynolds and capillary numbers (Re < 1 an
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Du, Xiangdong 1967. "Scaling laws in permeability and thermoelasticity of random media." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102973.

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Under consideration is the finite-size scaling of two thermomechanical responses of random heterogeneous materials. Stochastic mechanics is applied here to the modeling of heterogeneous materials in order to construct the constitutive relations. Such relations (e.g. Hooke's Law in elasticity or Fourier's Law in heat transfer) are well-established under spatial homogeneity assumption of continuum mechanics, where the Representative Volume Element (RVE) is the fundamental concept. The key question is what is the size L of RVE? According to the separation of scales assumption, L must be bounded a
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Book chapters on the topic "Porous jump"

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Sharma, Krishan, Subrata Kumar, and P. Deepu. "Velocity Slip and Temperature Jump in Homogeneous and Heterogeneous Porous Medium." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-7827-4_20.

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Levy, A., G. Ben-Dor, S. Sorek, and J. Bear. "Jump Conditions Across Strong Compaction Waves in Gas-Saturated Rigid Porous Media." In Shock Waves @ Marseille III. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78835-2_34.

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Silva, Diogo, João Silva, Paulo Pinto, Senhorinha Teixeira, and José Teixeira. "Analysis and Validation of a CFD Simulation of the Wind Through a Horizontal Axis Wind Turbine as an Actuator Disc with a Porous Jump Condition." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09382-1_16.

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"Analysis of Stress Jump Coefficient at a Fluid/Porous Interface." In International Conference on Mechanical Engineering and Technology (ICMET-London 2011). ASME Press, 2011. http://dx.doi.org/10.1115/1.859896.paper82.

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Zhang, Jiasheng, Zhigang Wang, Hongwei Zhang, and Shun Hu. "Study on the Hydraulic Characteristics in the Forebay of Inverted Siphon." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230805.

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The inverted siphon is a common hydraulic structure used in large-scale, long-distance water conveyance projects. Due to the limitations of terrain, landform and geological factors, the dimensions of the forebay of the inverted siphon are often limited. In order to evaluate its influences on the hydraulic characteristics in the forebay of inverted siphon, a physical model with the Froude scale of 1:30 for a forebay of inverted siphon in Guangdong Water Resources Allocation Project around the Beibu Gulf was established and corresponding tests were conducted. The results show that limited space
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Corfield, Penelope J. "Aristocrats, Plutocrats and Cross-Class Gentlemen." In The Georgians. Yale University Press, 2022. http://dx.doi.org/10.12987/yale/9780300253573.003.0013.

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This chapter reviews the concept of ‘civil society’ and social interconnectedness for the Georgians. It highlights that the concept conveyed a secular sphere of human interaction, with shared values and peaceable intentions. The chapter then jumps to discuss the unwritten rules in Britain which welded society together—and guided social ‘upstarts’ on how to behave. While British society at first glance still seemed highly traditional, headed by kings, dukes, and earls, the chapter reveals that it was in a prolonged state of flux at all social levels. It emphasizes that the old landed aristocrac
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Conference papers on the topic "Porous jump"

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Rossian, Lennart, Roland Ewert, and Jan Delfs. "Evaluation of Acoustic Jump Conditions at Discontinuous Porous Interfaces." In 23rd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3505.

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Rossian, Lennart, Benjamin W. Fassmann, Roland Ewert, and Jan Delfs. "Prediction of porous trailing edge noise reduction using acoustic jump-conditions at porous interfaces." In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2920.

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Chen, Hao, Jiabing Wang, and Kun Yang. "Analysis of the Momentum Transport Boundary Conditions at a Fluid-Porous Interface." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7395.

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The porous composite system is consists of porous medium and free fluid layer, which has extensive industrial applications. The study method for the flow field in the porous composite system includes the microscopic, mesoscopic and macroscopic approaches. When the two-domain approach is adopted, which is one of the macroscopic methods, the momentum transport boundary conditions at the interface between porous medium and free fluid layer is essential to analyze the flow field in the system. When Darcy equation is adopted to describe the flow in porous region, the Beavers-Joseph (BJ) interface c
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Chen, Baoming, Li Wang, Fang Liu, Heming Yun, and Wenguang Geng. "Effect of Mesoscopic Structure of Interface on Heat and Mass Transfer in a Partially Porous Cavity." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18372.

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Natural convective heat and mass transfer in a cavity partially filled with a vertical porous layer along the left wall was studied in this paper. Different uniform temperature and concentration were specified at the external vertical walls of the cavity while the horizontal walls are adiabatic and impermeable. Two-domain model together with weak constraint method at the porous/fluid interface was used to simulate the flow, heat and mass transfer in the cavity. The shear stress jump condition at the porous/fluid interface is invoked when the Brinkman-Forhheimer-extended Darcy model is used. Th
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Liu, Fang, Baoming Chen, and Li Wang. "Analysis of Stress Jump Condition at a Fluid/Porous Interface." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18366.

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Natural convection in partially porous cavities driven by buoyancy force has been given the attention in this paper. Two-domain model with continuous or discontinuous interfacial conditions and One-equation model with heterogeneous interface region were analyzed. FEM with weak constraint condition was applied to solve the differential governing equations. The influence of stress jump conditions at fluid/porous interface on flow and heat transfer in two-domain model was compared with that of heterogeneous interface region in one-domain model. Numerical results showed that vertical velocity was
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Valdés-Parada, Francisco J., Benoi^t Goyeau, J. Alberto Ochoa-Tapia, and Kambiz Vafai. "Derivation of Complete Jump Boundary Conditions Between Homogeneous Media." In POROUS MEDIA AND ITS APPLICATIONS IN SCIENCE, ENGINEERING, AND INDUSTRY: 3rd International Conference. AIP, 2010. http://dx.doi.org/10.1063/1.3453846.

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de Lemos, Marcelo J. S. "A Model for Turbulent Kinetic Energy Distribution Across the Interface Between a Porous Medium and an Unobstructed Region." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56763.

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The study of important environmental and engineering flows can benefit from more realistic modeling. Accordingly, grain storage and drying as well as flows over layers of vegetation can be characterized by some sort of porous structure through which a fluid permeates. For such hybrid media, involving both a porous structure and a clear flow region, difficulties arise due to the proper mathematical treatment given at the macroscopic interface. The literature proposes a jump condition in which shear stresses on both sides of the interface are not of the same value. This paper presents numerical
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Chen, Baoming, Fang Liu, Guoqing Zhang, and Zhi Liu. "Influence on Stress Jump Coefficient of Porous Structure and Flow Conditions." In The 15th International Heat Transfer Conference. Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.pmd.009590.

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de Lemos, Marcelo J. S., and Renato Alves da Silva. "Simulation of Turbulent Flow in a Channel Partially Occupied by a Porous Layer Considering the Stress Jump at the Interface." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31279.

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Environmental flows of extreme importance, such as turbulent atmospheric boundary layer over thick rain forests, may benefit from more realistic mathematical models. Accordingly, flow over layers of dense vegetation can be characterized by some sort of porous structure through which a fluid permeates. For hybrid media, involving both a porous structure and a clear flow region, difficulties arise due to the proper mathematical treatment given at the interface. The literature proposes a jump condition in which shear stresses on both sides of the interface are not of the same value. This paper pr
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Enright, Ryan, Cormac Eason, Tara Dalton, and Todd Salamon. "Transport in Superhydrophobic Microchannels: A Porous Modeling Approach." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32823.

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Superhydrophobic surfaces combine roughness features with low energy surfaces to create materials with substantially decreased wettability and reduced drag resistance in laminar flows. These characteristics make superhydrophobic surfaces a promising technology for reducing the flow resistance of microchannels in a variety of applications, including thermal management and biofluidics. The presence of a gas layer that is trapped within the superhydrophobic surface, and which separates the majority of the microchannel wall from the working fluid, gives rise to a low shear-stress region responsibl
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