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Letteratura scientifica selezionata sul tema "Compressibility Heat Fluid dynamics Porous materials"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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

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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Abstract (sommario):

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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