Phase-change phenomena in porous media – a non-local thermal equilibrium model

Harris, Kendall T.; Haji‐Sheikh, A.; Nnanna, A. G. Agwu

doi:10.1016/s0017-9310(00)00191-5

Cited by 52 publications

(21 citation statements)

References 11 publications

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“…Agwu Nnanna et al 4 also performed a series of experiments to study the phase change phenomenon in the porous media, and the result showed that the effective latent heat and the heat transfer coefficient played an important role in the process of the phase change. The same conclusion was also achieved by Harris et al 5 with numerical method. Akbari et al 6 studied the heat and mass transfer during the freezing process in the capillary porous media experimentally and numerically; Luikov's equations were used in their research and the phase transformation number was also taken into account.…”

Section: Introductionsupporting

confidence: 86%

Numerical simulation of condensation in microchannels between spherical particles

Liu

Peng

Ling

et al. 2016

Advances in Mechanical Engineering

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In this article, a numerical investigation of vapor condensation in a two-dimensional ordered microchannel was conducted with computational fluid dynamics software Fluent. A simplified physical model was built up to simulate a rectangular channel filled with particles. A constant wall heat flux was added to the side walls of the rectangular channel. Volume of fluid model was adopted to pursue the interface of the gas and liquid. The results showed that a better heat transfer performance could be obtained with the porous structure. The local heat transfer coefficient obtained from simulation was in good accordance with the former experimental data, which increased with the increase in fluid velocity and decreased along the flow direction. Parametric analyses were conducted concerning the effects of initial vapor velocity u 0 , initial temperature T 0 , and wall heat flux q w on local heat transfer coefficient. The velocity u 0 played a significant role during the process of condensation. Temperature distributions along the porous channel and side walls were also analyzed. The results showed that the temperature decreased along the flow direction and increased with the increase in fluid velocity.

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Section: Introductionsupporting

confidence: 86%

Numerical simulation of condensation in microchannels between spherical particles

Liu

Peng

Ling

et al. 2016

Advances in Mechanical Engineering

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“…Hinzman et al (1998) used a onedimensional subsurface model for simulating heat conduction and coupled it with a surface heat balance model to predict the thaw depth of the Kuparuk River watershed on the North Slope of Alaska from meteorologic data at seven stations. Harris et al (2001) developed an analytical approximation for the heat transport problem in porous media, explicitly accounting for non-equilibrium processes occurring during rapid phase change.…”

Section: Introductionmentioning

confidence: 99%

Modeling the thermal dynamics of the active layer at two contrasting permafrost sites on Svalbard and on the Tibetan Plateau

et al. 2011

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Abstract. Employing a one-dimensional, coupled thermal and hydraulic numerical model, we quantitatively analyze high-resolution, multi-year data from the active layers at two contrasting permafrost sites. The model implements heat conduction with the de Vries parameterization, heat convection with water and vapor flow, freeze-thaw transition parameterized with a heuristic soil-freezing characteristic, and liquid water flow with the Mualem-van Genuchten parameterization. The model is driven by measured temperatures and water contents at the upper and lower boundary with all required material properties deduced from the measured data. The aims are (i) to ascertain the applicability of such a rather simple model, (ii) to quantify the dominating processes, and (iii) to discuss possible causes of remaining deviations.Soil temperatures and water contents as well as characteristic quantities like thaw depth and duration of the isothermal plateau could be reproduced. Heat conduction is found to be the dominant process by far at both sites, with nonconductive transport contributing a maximum of some 3 % to the mean heat flux at the Spitsbergen site, most of the time very much less, and practically negligible at the Tibetan site. Hypotheses discussed to explain the remaining deviations between measured and simulated state variables include, besides some technical issues, infiltration of snow Correspondence to: K. Roth (kurt.roth@iup.uni-heidelberg.de) melt, dry cracking with associated vapor condensation, and mechanical soil expansion in detail.

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“…However, the actual physical processes show that the convection type of heat transfer may be present in the liquid and often plays an important role (Brewster and Gebhart, 1988;Chellaiah and Viskanta;1989;Zhang and Bejan, 1989;Gobin and Benard, 1992;Fukusako and Yamada, 1993). There have been more rigorous modelling studies in the recent years (Liang and Lan, 1996;Zhang et al, 1996;Chang and Yang, 1996;Sasaguchi et al, 1996;Iyer and Vafai, 1998;Amin and Greif, 1999;Harris et al, 2001). Most of the models, however, use constant liquid density approximation in some or all terms of the governing equations of the phase change process and/or lack a quantitative comparison with experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of melting of ice involving natural convection

Kahraman

2002

Int. J. Energy Res.

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SUMMARYTwo-dimensional transient melting of ice in a rectangular enclosure was numerically and experimentally investigated. Natural convection in the liquid phase due to the temperature dependency of water density was considered in the numerical model. The implicit "nite di!erence method with "xed staggered grid approach was utilized. The SIMPLER algorithm was followed for the solution of pressure and velocity "elds in the liquid phase. The prediction of the model was found to be satisfactory through preliminary experimentation.

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Phase-change phenomena in porous media – a non-local thermal equilibrium model

Cited by 52 publications

References 11 publications

Numerical simulation of condensation in microchannels between spherical particles

Numerical simulation of condensation in microchannels between spherical particles

Modeling the thermal dynamics of the active layer at two contrasting permafrost sites on Svalbard and on the Tibetan Plateau

Numerical and experimental investigation of melting of ice involving natural convection

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