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Articoli di riviste sul tema "Compressibility Heat Fluid dynamics Porous materials"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Malan, A. G., and R. W. Lewis. "An artificial compressibility CBS method for modelling heat transfer and fluid flow in heterogeneous porous materials." International Journal for Numerical Methods in Engineering 87, no. 1-5 (2011): 412–23. http://dx.doi.org/10.1002/nme.3125.

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2

Shajii, A., and J. P. Freidberg. "Theory of low Mach number compressible flow in a channel." Journal of Fluid Mechanics 313 (April 25, 1996): 131–45. http://dx.doi.org/10.1017/s0022112096002157.

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The properties of a relatively uncommon regime of fluid dynamics, low Mach number compressible flow are investigated. This regime, which is characterized by an exceptionally large channel aspect ratio L/d ∼ 106 leads to highly subsonic flows in which friction dominates inertia. Even so, because of the large aspect ratio, finite pressure, temperature, and density gradients are required, implying that compressibility effects are also important. Analytical results are presented which show, somewhat unexpectedly, that for forced channel flow, steady-state solutions exist only below a critical valu

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3

Romano, V., U. Tammaro, and P. Capuano. "A 2-D FEM thermal model to simulate water flow in a porous media: Campi Flegrei caldera case study." Nonlinear Processes in Geophysics 19, no. 3 (2012): 323–33. http://dx.doi.org/10.5194/npg-19-323-2012.

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Abstract. Volcanic and geothermal aspects both exist in many geologically young areas. In these areas the heat transfer process is of fundamental importance, so that the thermal and fluid-dynamic processes characterizing a viscous fluid in a porous medium are very important to understand the complex dynamics of the these areas. The Campi Flegrei caldera, located west of the city of Naples, within the central-southern sector of the large graben of Campanian plain, is a region where both volcanic and geothermal phenomena are present. The upper part of the geothermal system can be considered roug

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4

Cortellessa, Gino, Fausto Arpino, Simona Di Fraia, and Mauro Scungio. "Two-phase explicit CBS procedure for compressible viscous flow transport in porous materials." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 2 (2018): 336–60. http://dx.doi.org/10.1108/hff-02-2017-0080.

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Purpose In this work, a new two-phase version of the finite element-based Artificial Compressibility (AC) Characteristic-Based Split (CBS) algorithm is developed and applied for the first time to heat and mass transfer phenomena in porous media with associated phase change. The purpose of this study is to provide an alternative for the theoretical analysis and numerical simulation of multiphase transport phenomena in porous media. Traditionally, the more complex Separate Flow Model was used in which the vapour and liquid phases were considered as distinct fluids and mathematically described by

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5

Azadbakhti, Reza, Farzad Pourfattah, Abolfazl Ahmadi, Omid Ali Akbari, and Davood Toghraie. "Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 5 (2019): 2739–57. http://dx.doi.org/10.1108/hff-03-2019-0194.

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Purpose The purpose of this study is simulation the flow boiling inside a tube in the turbulent flow regime for investigating the effect of using a porous medium in the boiling procedure. Design/methodology/approach To ensure the accuracy of the obtained numerical results, the presented results have been compared with the experimental results, and proper coincidence has been achieved. In this study, the phase change phenomenon of boiling has been modeled by using the Eulerian–Eulerian multi-phase Rensselaer Polytechnic Institute (RPI) wall boiling model. Findings The obtained results indicate

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6

Massarotti, Nicola, Michela Ciccolella, Gino Cortellessa, and Alessandro Mauro. "New benchmark solutions for transient natural convection in partially porous annuli." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 3/4 (2016): 1187–225. http://dx.doi.org/10.1108/hff-11-2015-0464.

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Purpose – The purpose of this paper is to focus on the numerical analysis of transient free convection heat transfer in partially porous cylindrical domains. The authors analyze the dependence of velocity and temperature fields on the geometry, by analyzing transient flow behavior for different values of cavity aspect ratio and radii ratio; both inner and outer radius are assumed variable in order to not change the difference ro-ri. Moreover, several Darcy numbers have been considered. Design/methodology/approach – A dual time-stepping procedure based on the transient artificial compressibilit

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7

Qi, Xiaoni, and Yongqi Liu. "Heat Storage Performance of a Honeycomb Ceramic Monolith." Open Fuels & Energy Science Journal 7, no. 1 (2014): 113–20. http://dx.doi.org/10.2174/1876973x01407010113.

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Honeycomb ceramic is the key component of the regenerative system. The three-dimensional numerical model has been established for thermal process in honeycomb regenerator. The numerical simulation was performed using FLUENT, a commercial computational fluid dynamics (CFD) code, to compare simulation results to the test data. The regenerative process of a honeycomb ceramic regenerator was simulated under different conditions. The results under different flow rates, different flowing time, different materials and different wall thickness were investigated. The work in this paper provides a theor

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8

Otomo, Yusuke, Edgar Santiago Galicia, and Koji Enoki. "Enhancement of Subcooled Flow Boiling Heat Transfer with High Porosity Sintered Fiber Metal." Applied Sciences 11, no. 3 (2021): 1237. http://dx.doi.org/10.3390/app11031237.

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We conducted experimental research using high-porosity sintered fiber attached on the surface, as a passive method to increase the heat flux for subcooled flow boiling. Two different porous thicknesses (1 and 0.5 mm) and one bare surface (0 mm) were compared under three different inlet subcooling temperatures (30, 50 and 70 K) and low mass flux (150–600 kg·m−2·s−1) using deionized water as the working fluid under atmospheric pressure. The test section was a rectangular channel, and the hydraulic diameter was 10 mm. The results showed that the heat flux on porous surfaces with a thickness of 1

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9

Xing, Z. B., Xingchao Han, Hanbing Ke, et al. "Multi-phase lattice Boltzmann (LB) simulation for convective transport of nanofluids in porous structures with phase interactions." International Journal of Numerical Methods for Heat & Fluid Flow 31, no. 8 (2021): 2754–88. http://dx.doi.org/10.1108/hff-07-2020-0481.

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Purpose A combination of highly conductive porous media and nanofluids is an efficient way for improving thermal performance of relevant applications. For precisely predicting the flow and thermal transport of nanofluids in porous media, the purpose of this paper is to explore the inter-phase coupling numerical methods. Design/methodology/approach Based on the lattice Boltzmann (LB) method, this study combines the convective flow, non-equilibrium thermal transport and phase interactions of nanofluids in porous matrix and proposes a new multi-phase LB model. The micro-scale momentum and heat in

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10

MOHAMMADI, ALIASGHAR, and REGHAN J. HILL. "Dynamics of uncharged colloidal inclusions in polyelectrolyte hydrogels." Journal of Fluid Mechanics 669 (January 14, 2011): 298–327. http://dx.doi.org/10.1017/s0022112010005045.

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We calculate the dynamics of an uncharged colloidal sphere embedded in a quenched polyelectrolyte hydrogel to (i) an oscillatory (optical and magnetic) force, as adopted in classical micro-rheology, and (ii) an oscillatory electric field, as adopted in electrical micro-rheology and electro-acoustics. The hydrogel is modelled as a linearly elastic porous medium with the charge fixed to the skeleton and saturated with a Newtonian electrolyte; and the colloidal inclusion is modelled as a rigid, impenetrable sphere. The dynamic micro-rheological susceptibility, defined as the ratio of the particle

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11

Das, S., Asgar Ali, and R. N. Jana. "Insight into the dynamics of magneto-casson hybrid nanoliquid caused by a plate rotation." World Journal of Engineering 18, no. 1 (2020): 66–84. http://dx.doi.org/10.1108/wje-07-2020-0261.

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Purpose This paper aims to present the analytical investigation on an unsteady magneto-convective rotation of an electrically conducting non-Newtonian Casson hybrid nanoliquid past a vertical porous plate. The effects of thermal radiation, heat source/sink and hydrodynamic slip phenomenon are also taken into account. Ethylene glycol (EG) is adopted as a base Casson fluid. The Casson fluid model is accounted for to describe the rheological characteristics of non-Newtonian fluid. EG with copper and alumina nanoparticles is envisaged as a non-Newtonian Casson hybrid nanoliquid. The copper-alumina

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12

Kubilay, Aytaç, Jonas Allegrini, Dominik Strebel, Yongling Zhao, Dominique Derome, and Jan Carmeliet. "Advancement in Urban Climate Modelling at Local Scale: Urban Heat Island Mitigation and Building Cooling Demand." Atmosphere 11, no. 12 (2020): 1313. http://dx.doi.org/10.3390/atmos11121313.

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As cities and their population are subjected to climate change and urban heat islands, it is paramount to have the means to understand the local urban climate and propose mitigation measures, especially at neighbourhood, local and building scales. A framework is presented, where the urban climate is studied by coupling a meteorological model to a building-resolved local urban climate model, and where an urban climate model is coupled to a building energy simulation model. The urban climate model allows for studies at local scale, combining modelling of wind and buoyancy with computational flui

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Ferrari, Andrea, Aytac Kubilay, Dominique Derome, and Jan Carmeliet. "Design of smart wetting of building materials as evaporative cooling measure for improving the urban climate during heat waves." E3S Web of Conferences 172 (2020): 03001. http://dx.doi.org/10.1051/e3sconf/202017203001.

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An urban microclimate model is used to design a smart wetting protocol for multilayer street pavements in order to maximize the evaporative cooling effect as a mitigation measure for thermal discomfort during heat waves. The microclimate model covers a computational fluid dynamics (CFD) model for solving the turbulent air, heat and moisture flow in the air domain of a street canyon. The CFD model is coupled to a model for heat and moisture transport in porous urban materials, to a radiative exchange model, determining the net solar and longwave radiation on each urban surface and to a wind dri

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14

Wang, Qiang, Shengli Tang, Sen Tian, Xiaojian Wei, and Tiefeng Peng. "Molecular Simulations of Adsorption and Thermal Energy Storage of Mixed R1234ze/UIO-66 Nanoparticle Nanofluid." Journal of Nanomaterials 2019 (June 16, 2019): 1–5. http://dx.doi.org/10.1155/2019/5154173.

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In the process of adsorption and separation of fluid molecules on the solid surface of porous nanomaterials, the mutual transformation of thermal energy and surface energy can improve the heat absorption and energy utilization efficiency of circulating working medium. In this study, the adsorption, thermal energy storage, and mean square displacement of the minimum energy adsorption configuration of R1234ze in UIO-66 were studied by molecular simulations, including molecular dynamics (MD) and grand canonical Monte Carlo (GCMC) simulations. The results show that the thermal energy storage densi

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15

Abdulkarim, Ali H., Ali Ates, Kemal Altinisik, and Eyüb Canli. "Internal flow analysis of a porous burner via CFD." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 8 (2019): 2666–83. http://dx.doi.org/10.1108/hff-07-2018-0413.

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Purpose This study aims to introduce a metal porous burner design. Literature is surveyed in a comprehensive manner to relate the current design with ongoing research. A demonstrative computational fluid dynamics (CFD) analysis is presented with projected flow conditions by means of a common commercial CFD code and turbulence model to show the flow-related features of the proposed burner. The porous metal burner has a novel design, and it is not commercially available. Design/methodology/approach Based on the field experience about porous burners, a metal, cylindrical, two-staged, homogenous p

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16

Ip, Ralph W. L., and Elvis Iok Cheong Wan. "New Use Heat Transfer Theories for the Design of Heat Setting Machines for Precise Post-Treatment of Dyed Fabrics." Defect and Diffusion Forum 312-315 (April 2011): 748–51. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.748.

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Fabrics are needed further treatment after dyeing to restore their original mechanical properties by suitable drying/shrinkage process because of wetted and elongated fabrics cannot be used for clothes making. Heating up the dyed fabrics at suitable temperature can restore their original shapes and geometries by releasing the internal stress introduced by dyeing process. Thus, heat setting is a commonly used post-treatment process to stabilize fabric geometrical dimensions and prevent further shrinkage. Hot air jet impingement [1] and moist heat are conventional drying methods for different ap

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17

Zhang, Dan, Yanhong Wei, Xiaohong Zhan, Jie Chen, Hao Li, and Yuhua Wang. "Numerical simulation of keyhole behaviors and droplet transfer in laser-MIG hybrid welding of Invar alloy." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 9 (2018): 1974–93. http://dx.doi.org/10.1108/hff-07-2017-0266.

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Purpose This paper aims to describe a three-dimensional mathematical and numerical model based on finite volume method to simulate the fluid dynamics in weld pool, droplet transfer and keyhole behaviors in the laser-MIG hybrid welding process of Fe36Ni Invar alloy. Design/methodology/approach Double-ellipsoidal heat source model and adaptive Gauss rotary body heat source model were used to describe electric arc and laser beam heat source, respectively. Besides, recoil pressure, electromagnetic force, Marangoni force, buoyancy as well as liquid material flow through a porous medium and the heat

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18

Fulpagare, Yogesh, Yogendra Joshi, and Atul Bhargav. "Rack level transient CFD modeling of data center." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 2 (2018): 381–94. http://dx.doi.org/10.1108/hff-10-2016-0426.

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Purpose The paper aims to capture the rack-level thermal dynamics in data center. It proposes the rack-level response experiments as well as transient Computational Fluid Dynamics (CFD) analysis to characterize the local thermal environment of the system. Design/methodology/approach A single sever simulator rack and its two neighboring racks with its cold and hot aisle containment have been modeled with known cold air supply temperature and flow rate for transient CFD analysis. The heat load was kept constant initially and varied case-to-case basis, which includes capturing the rack-level resp

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19

Hossain, M., M. Acar, and W. Malalasekera. "Modelling of the Through-air Bonding Process." Journal of Engineered Fibers and Fabrics 4, no. 2 (2009): 155892500900400. http://dx.doi.org/10.1177/155892500900400202.

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A computational fluid dynamics (CFD) modelling of the through-air bonding process of nonwoven fabric production is reported in this article. In the through-air process, hot air is passed through the fibrous web to heat and melt polymer fibers. Molten polymer subsequently flows to the point of contact between any two fibers to produce a bond. Two different modelling strategies are adapted to produce a comprehensive understanding of the through-air bonding process. In macroscale modelling, a CFD model is developed treating the whole web as a porous media in order to investigate the effect of pro

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20

Kieraś, Seweryn, Marek Jakubowski, and Krzysztof Nadolny. "Simulation Studies on Centrifugal MQL-CCA Method of Applying Coolant during Internal Cylindrical Grinding Process." Materials 13, no. 11 (2020): 2506. http://dx.doi.org/10.3390/ma13112506.

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This paper describes simulation studies regarding the application of the centrifugal minimum quantity lubrication (MQL) method simultaneously with the delivery of a compressed cooled air (CCA) stream in the internal cylindrical grinding process. The idea of a new hybrid cooling and lubrication method connecting centrifugal (through a grinding wheel) lubrication by MQL with a CCA stream is described. The methodology of computational fluid dynamics (CFD) simulation studies, as well as the results of numerical simulations, are presented in detail. The aim of the simulations was to determine the m

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Fischer, Michael. "First-Principles Study of AlPO4-H3, a Hydrated Aluminophosphate Zeotype Containing Two Different Types of Adsorbed Water Molecules." Molecules 24, no. 5 (2019): 922. http://dx.doi.org/10.3390/molecules24050922.

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Porous aluminophosphate zeotypes (AlPOs) are promising materials for heat transformation applications using water as a working fluid. Two “types” of adsorbed water molecules can be distinguished in hydrated AlPOs: Water molecules adsorbed in the direct proximity of framework aluminium atoms form bonds to these Al atoms, with the coordination number of Al increasing from four to five or six. The remaining water molecules that are adsorbed in other parts of the accessible pore space are not strongly bonded to any framework atom, they interact with their environment exclusively through hydrogen b

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Doumbia, E. Moustapha, David Janke, Qianying Yi, et al. "On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB." Applied Sciences 11, no. 10 (2021): 4560. http://dx.doi.org/10.3390/app11104560.

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The tracer gas method is one of the common ways to evaluate the air exchange rate in a naturally ventilated barn. One crucial condition for the accuracy of the method is that both considered gases (pollutant and tracer) are perfectly mixed at the points where the measurements are done. In the present study, by means of computational fluids dynamics (CFD), the mixing ratio NH3/CO2 is evaluated inside a barn in order to assess under which flow conditions the common height recommendation guidelines for sampling points (sampling line and sampling net) of the tracer gas method are most valuable. Ou

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23

Duggirala, Ravi K., Christopher J. Roy, S. M. Saeidi, Jay M. Khodadadi, Don R. Cahela, and Bruce J. Tatarchuk. "Pressure Drop Predictions in Microfibrous Materials Using Computational Fluid Dynamics." Journal of Fluids Engineering 130, no. 7 (2008). http://dx.doi.org/10.1115/1.2948363.

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Three-dimensional computational fluid dynamics simulations are performed for the flow of air through microfibrous materials for void fractions of 0.41 and 0.47 and face velocities ranging between 0.04ms and 1.29m∕s. The microfibrous materials consist of activated carbon powder with diameters of 137×10−6m entrapped in a matrix of cylindrical fibers with diameters of 8×10−6m. These sintered microfibrous materials are a new class of patented materials with properties that are advantageous compared to traditional packed beds or monoliths. Microfibrous materials have demonstrated enhanced heat and

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24

Catton, Ivan. "Conjugate Heat Transfer Within a Heterogeneous Hierarchical Structure." Journal of Heat Transfer 133, no. 10 (2011). http://dx.doi.org/10.1115/1.4003576.

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Optimization of heat exchangers (HE), compact heat exchangers (CHE) and microheat exchangers, by design of their basic structures is the focus of this work. Consistant models are developed to describe transport phenomena in a porous medium that take into account the scales and other characteristics of the medium morphology. Equation sets allowing for turbulence and two temperature or two concentration diffusion are obtained for nonisotropic porous media with interface exchange. The equations differ from known equations and were developed using a rigorous averaging technique, hierarchical model

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Shi, Junxiang, and Xingjian Xue. "Bifunctionally Graded Electrode Supported SOFC Modeling and Computational Thermal Fluid Analysis for Experimental Design." Journal of Fuel Cell Science and Technology 8, no. 1 (2010). http://dx.doi.org/10.1115/1.4002141.

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A comprehensive 3D computational fluid dynamics (CFD) model is developed for a bi-electrode supported cell (BSC) solid oxide fuel cell (SOFC). The model includes complicated transport phenomena of mass/heat transfer, charge (electron and ion) migration, and electrochemical reactions. The uniqueness of the modeling study is that functionally graded porous electrode property is taken into account, including not only linear but also nonlinear porosity distributions. The model is validated using experimental data from open literature. Numerical results indicate that BSC performance is strongly dep

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26

Qiu, Bo, and Jun Li. "Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method." Journal of Heat Transfer 135, no. 12 (2013). http://dx.doi.org/10.1115/1.4024556.

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Brush seals have been applied in more and more challenging high-temperature locations. The high speed bristle-rotor friction causes a considerable heat generation which accelerates the bristles wear. The frictional heat generation at bristle-rotor interface becomes another major concern in brush seal applications. This study presented detailed investigations on the heat transfer characteristics and contact mechanics of brush seals using a combined computational fluid dynamics (CFD) and finite element method (FEM) brush seal model. The CFD model of brush seal for mass and heat transfer employed

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DeGroot, Christopher T., Derek Gateman, and Anthony G. Straatman. "The Effect of Thermal Contact Resistance at Porous-Solid Interfaces in Finned Metal Foam Heat Sinks." Journal of Electronic Packaging 132, no. 4 (2010). http://dx.doi.org/10.1115/1.4002724.

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A numerical study on the effect of thermal contact resistance and its impact on the performance of finned aluminum foam heat sinks has been conducted. Calculations are based on the solution of the volume-averaged mass, momentum, and energy equations under conditions of local thermal nonequilibrium using a finite-volume-based computational fluid dynamics code for conjugate fluid/porous/solid domains. Numerical results have been obtained for a wide range of contact resistances at the porous-solid interfaces, up to the limit of an effectively infinite resistance. As the contact resistance is incr

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Mallikarjuna, B., J. Srinivas, G. Gopi Krishna, O. Anwar Bég, and Ali Kadir. "Spectral Numerical Study of Entropy Generation in Magneto-Convective Viscoelastic Biofluid Flow Through Poro-Elastic Media With Thermal Radiation and Buoyancy Effects." Journal of Thermal Science and Engineering Applications 14, no. 1 (2021). http://dx.doi.org/10.1115/1.4050935.

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Abstract Electromagnetic high-temperature therapy is popular in medical engineering treatments for various diseases including tissue damage ablation repair, hyperthermia, and oncological illness diagnosis. The simulation of transport phenomena in such applications requires multi-physical models featuring magnetohydrodynamics, biorheology, heat transfer, and deformable porous media. Motivated by investigating the fluid dynamics and thermodynamic optimization of such processes, in the present article, a mathematical model is developed to study the combined influence of thermal buoyancy, magnetic

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Vadi, Roozbeh, and Kamran Sepanloo. "Numerical Investigation of Regular and Hybrid Nanofluids Application as the Working Fluids on Thermal Performance of TPCT." Journal of Thermal Science and Engineering Applications 11, no. 4 (2019). http://dx.doi.org/10.1115/1.4043967.

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Two-phase closed thermosyphon (TPCT) is a cost-effective heat transfer device with high thermal efficiency owing to extensive interphase heat and mass transfer. Thus, TPCT has found many industrial applications. Proper selection of the working fluid could further improve efficiency of TPCT, and nanofluids with superior thermal properties are suitable choices. Numerical simulation of boiling and condensation, natural circulation, and hybrid nanofluid modeling in a closed space is a notable challenge and current study is devoted to this subject. In this study, a novel methodology for incorporati

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Alfieri, Fabio, Manish K. Tiwari, Igor Zinovik, Dimos Poulikakos, Thomas Brunschwiler, and Bruno Michel. "3D Integrated Water Cooling of a Composite Multilayer Stack of Chips." Journal of Heat Transfer 132, no. 12 (2010). http://dx.doi.org/10.1115/1.4002287.

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New generation supercomputers with three dimensional stacked chip architectures pose a major challenge with respect to the removal of dissipated heat, which can reach currently as high as 250 W/cm2 in multilayer chip stacks of less than 0.3 cm3 volume. Interlayer integrated water cooling is a very promising approach for such high heat flux removal due to much larger thermal capacity and conductivity of water compared with air, the traditional cooling fluid. In the current work, a multiscale conjugate heat transfer model is developed for integrated water cooling of chip layers and validated wit

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Zhou, Feng, and Ivan Catton. "A Numerical Investigation of Turbulent Flow and Heat Transfer in Rectangular Channels With Elliptic Scale-Roughened Walls." Journal of Heat Transfer 135, no. 8 (2013). http://dx.doi.org/10.1115/1.4024278.

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In the present paper, rectangular channels with six types of elliptic scale-roughened walls for heat transfer enhancement are numerically studied. Heat transfer and fluid flow characteristics for sixteen different scale-roughened models (with the scale height varying in the range from 1 mm to 2.5 mm) are numerically predicted using commercial computational fluid dynamics (CFD) code, Ansys cfx. The turbulent model employed is the k–ω based shear–stress transport (SST) model with automatic wall function treatment. In the performance evaluation, we use a “universal” porous media length scale base

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Narayana, M., A. A. Khidir, P. Sibanda, and P. V. S. N. Murthy. "Soret Effect on the Natural Convection From a Vertical Plate in a Thermally Stratified Porous Medium Saturated With Non-Newtonian Liquid." Journal of Heat Transfer 135, no. 3 (2013). http://dx.doi.org/10.1115/1.4007880.

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The paper highlights the application of a recent seminumerical successive linearization method (SLM) in solving highly coupled, nonlinear boundary value problem. The method is presented in detail by solving the problem of free convection flow due to a vertical plate embedded in a non-Darcy thermally stratified porous medium saturated with a non-Newtonian power-law liquid. Thermal-diffusion (Soret) and variable viscosity effects are taken into consideration. The Ostwald–de Waele power-law model is used to characterize the non-Newtonian behavior of the fluid. The governing partial differential e

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Kubilay, Aytaç, Andrea Ferrari, Dominique Derome, and Jan Carmeliet. "Smart wetting of permeable pavements as an evaporative-cooling measure for improving the urban climate during heat waves." Journal of Building Physics, November 4, 2020, 174425912096858. http://dx.doi.org/10.1177/1744259120968586.

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An urban microclimate model is used to design a smart wetting protocol for multilayer street pavements in order to maximize the evaporative cooling effect as a mitigation measure for thermal discomfort during heat waves. The microclimate model is built upon a computational fluid dynamics (CFD) model for solving the turbulent air, heat and moisture flow in the air domain of a street canyon. The CFD model is coupled to a model for heat and moisture transport in porous urban materials and to a radiative exchange model, determining the net solar and thermal radiation on each urban surface. A two-l

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S., Shashi Prabha Gogate, Bharathi M. C., and Ramesh B. Kudenatti. "Linear Stability on the Local Thermal Nonequilibrium Model of Mixed Convection Boundary Layer Flow over a Moving Wedge in a Porous Medium: Viscous Dissipation and Radiation Effects." Journal of Heat Transfer 143, no. 4 (2021). http://dx.doi.org/10.1115/1.4049514.

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Abstract This paper studies the local thermal nonequilibrium (LTNE) model for two-dimensional mixed convection boundary-layer flow over a wedge, which is embedded in a porous medium in the presence of radiation and viscous dissipation. It is considered that the temperature of the fluid and solid phases is not identical; hence, we require two energy equations: one for each phase. The motion of the mainstream and wedge is approximated by the power of distance from the leading boundary layer. The flow and heat transfer in the LTNE phase is governed by the coupled partial differential equations, w

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Zhang, Li-Zhi. "Flow Maldistribution and Performance Deteriorations in Membrane-Based Heat and Mass Exchangers." Journal of Heat Transfer 131, no. 11 (2009). http://dx.doi.org/10.1115/1.3154832.

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Heat mass exchangers are crucial for the prevention of epidemic respiratory diseases such as H1N1 (swine flu). The flow maldistribution affects their performance seriously. The flow maldistribution and the consequent performance deteriorations in heat and mass exchangers are investigated. The focus is on moisture effectiveness deteriorations. As a first step, a computational fluid dynamics (CFD) code is used to calculate the flow distribution, by treating the plate-fin core as a porous medium. Then a coupled heat and moisture transfer model between the two air flows in the plate-fin channels i

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Biswas, Nirmalendu, Aparesh Datta, Nirmal K. Manna, Dipak Kumar Mandal, and Rama Subba Reddy Gorla. "Thermo-bioconvection of oxytactic microorganisms in porous media in the presence of magnetic field." International Journal of Numerical Methods for Heat & Fluid Flow ahead-of-print, ahead-of-print (2020). http://dx.doi.org/10.1108/hff-07-2020-0410.

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Purpose This study aims to explore magnetohydrodynamic (MHD) thermo-bioconvection of oxytactic microorganisms in multi-physical directions addressing thermal gradient, lid motion, porous substance and magnetic field collectively using a typical differentially heated two-sided lid-driven cavity. The consequences of a range of pertinent parameters on the flow structure, temperature, oxygen isoconcentration and microorganisms’ isoconcentration are examined and explained in great detail. Design/methodology/approach Two-dimensional governing equations in a two-sided lid-driven porous cavity heated

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Miccoli, Claudio, Alessandro Turchi, Pierre Schrooyen, Domenic D’Ambrosio, and Thierry Magin. "Detailed Modeling of Cork-Phenolic Ablators in Preparation for the Post-flight Analysis of the QARMAN Re-entry CubeSat." Aerotecnica Missili & Spazio, June 28, 2021. http://dx.doi.org/10.1007/s42496-021-00084-4.

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AbstractThis work deals with the analysis of the cork P50, an ablative thermal protection material (TPM) used for the heat shield of the qarman Re-entry CubeSat. Developed for the European Space Agency (ESA) at the von Karman Institute (VKI) for Fluid Dynamics, qarman is a scientific demonstrator for Aerothermodynamic Research. The ability to model and predict the atypical behavior of the new cork-based materials is considered a critical research topic. Therefore, this work is motivated by the need to develop a numerical model able to respond to this demand, in preparation to the post-flight a

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Hasan, Mainul, and Latifa Begum. "Industrial Direct Chill Slab Caster of Tin Bronze (C903) Using a Porous Filter in the Hot-Top." Journal of Thermal Science and Engineering Applications 10, no. 2 (2017). http://dx.doi.org/10.1115/1.4037196.

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A 3D computational fluid dynamics (CFD) modeling study has been carried out for the tin bronze (C903) slab of industrial size in a vertical direct chill caster. The melt is delivered from the top across the entire cross section of the caster. An insulated hot-top is considered above the 80-mm mold to control the melt level in the mold. A porous filter is considered in the hot-top region of the mold to arrest the incoming inclusions and homogenize the flow into the mold. The melt flow through the porous filter is modeled on the basis of the Brinkmann–Forchheimer-extended non-Darcy model. Result

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Saurabh, Sandeep Kumar, and D. S. Murthy. "Insights Into Thermal Transactions of a Novel Rotating Packed Bed." Journal of Thermal Science and Engineering Applications 14, no. 1 (2021). http://dx.doi.org/10.1115/1.4050836.

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Abstract The field of the rotating packed bed (RPB) and its applications in the transfer processes are multidisciplinary in nature. The achievement of significant volume reduction by employing the RPB in distillation towers has been fairly established in the mass transfer domain. Nevertheless, the prospect of RPB in the heat transfer domain still remains dormant. The current work addresses this very issue by exploring the characteristics of thermal transactions across the novel RPB device. This study succinctly presents the related aspects with multi-phase flow of participating fluids in the c

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Yuan, Jinliang, Guogang Yang, and Bengt Sunden. "Simulation of Surface Reactions and Multiscale Transport Processes in a Composite Anode Domain Relevant for Solid Oxide Fuel Cells." Journal of Fuel Cell Science and Technology 10, no. 2 (2013). http://dx.doi.org/10.1115/1.4023540.

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There are various transport phenomena (gas-phase species, heat, and momentum) occurring at different length scales in anode-supported solid oxide fuel cells (SOFCs), which are strongly affected by catalytic surface reactions at active triple-phase boundaries (TPBs) between the void space (for gas), Ni (catalysts for electrons), and YSZ (an electrolyte material for ions). To understand the multiscale chemical-reacting transport processes in the cell, a three-dimensional numerical calculation approach (the computational fluid dynamics (CFD) method) is further developed and applied for a composit

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Wernet, Mark P., Nicholas J. Georgiadis, and Randy J. Locke. "Raman temperature and density measurements in supersonic jets." Experiments in Fluids 62, no. 3 (2021). http://dx.doi.org/10.1007/s00348-021-03162-2.

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AbstractPrediction of flow-field properties in supersonic jets using computational fluid dynamics (CFD) code predictions has become routine; however, obtaining accurate solutions becomes more challenging when there is a significant temperature difference between the jet core and the ambient air and/or compressibility effects are significant. Benchmark sets of flow field property data are required in order to assess current CFD capabilities and develop better modeling approaches for these turbulent flow fields where accurate calculation of temperatures and turbulent heat flux is important. Part

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Cai, Shouyin, Sen Tian, Yiyu Lu, Guangjin Wang, Yu Pu, and Kang Peng. "Molecular Simulations of Adsorption and Energy Storage of R1234yf, R1234ze(z), R134a, R32, and their Mixtures in M-MOF-74 (M = Mg, Ni) Nanoparticles." Scientific Reports 10, no. 1 (2020). http://dx.doi.org/10.1038/s41598-020-64187-x.

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Abstract The refrigerant circulation heat can be enhanced through the mutual transformation between thermal energy and surface energy during the adsorption and separation process of fluid molecules in porous materials. In this paper, the adsorption and energy storage of R1234ze(z), R1234yf, R32 and R134a, as well as their mixed refrigerants in Mg-MOF-74 and Ni-MOF-74 nanoparticles were investigated by means of molecular dynamics simulations and grand canonical Monte Carlo simulations. The results suggested that, in the case of pure refrigerant adsorption, the adsorption quantities of R32 and R

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"Les Modtles Asymptotiques de la MBcanique des Fluides I, II. By R. KH. ZEYTOUNIAN. Springer. Vol. I, 1986. 260 pp. DM 38; Vol. 11, 1987. 315 pp. DM 53. Dynamics of Fluids in Hierarchical Porous Media. Edited by J. H. CUSHMAN. Academic, 1990. 505 pp. £48. The Mathematical Theory of Non-uniform Gases. By S. CHAPMAN and T. G. COWLING. Cambridge University Press, 1990. 423 pp. £19.50 or $32.50. Theory of Macroscopic Systems. By C. OUWERKERK. Springer, 1991. 245 pp. DM 48. BASIC Fluid Mechanics. By J. J. SHARP. Butterworths, 1988. 139 pp. £9.95. BASIC Hydrodynamics. By A. C. THOMSON. Butterworths, 1987. 179 pp. £9.95. BASIC Heat Transfer. By D. H. BACON. Butterworths, 1989. 172 pp. £12.95." Journal of Fluid Mechanics 231 (October 1991): 691–93. http://dx.doi.org/10.1017/s0022112091223563.

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