Experimental flow in various porous media and reconciliation of Forchheimer and Ergun relations

Dukhan, Nihad; Bağcı, Özer; Özdemir, Mustafa

doi:10.1016/j.expthermflusci.2014.06.011

Cited by 93 publications

(49 citation statements)

References 40 publications

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“…The determination of the Forchheimer coefficient tends to be calculated using the best-fit information from experimental data. The Forchheimer coefficient is strongly dependent on the internal structure of the porous medium (Dukhan et al, 2014). Previous work has shown that for the same porous medium, different values of permeability exist in different flow regimes (Dukhan et al, 2014).…”

Section: Tablementioning

confidence: 99%

“…As suggested in Dukhan et al (2014) permeability within a Darcy regime is considered constant, while in the Forchheimer regime, it decreases with increasing velocity. This observation agrees with the modelling output descriptions when compared to the Re numbers of those areas.…”

Section: Tablementioning

confidence: 99%

“…A departure from Darcy regime occurs at order unity (Re ≫ 1) (Dukhan et al, 2014;Kolditz, 2001). The order of critical Reynolds numbers, when non-linear effects become evident is 1-10 based on previously conducted experiments (Barenblatt et al, 1990).…”

Section: Tablementioning

confidence: 99%

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Experimental determination of noble gases and SF6, as tracers of CO2 flow through porous sandstone

et al. 2018

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A B S T R A C TIn order to label the CO 2 injected underground for geological storage and allow it to be differentiated from natural sources, a panoply of additive chemical tracers have been proposed. Yet, the transport of these tracers relative to CO 2 in pore space is currently poorly constrained. This leads to uncertainty as to whether tracers will act as an early warning of CO 2 arrival, or be preferentially retained in the pore space making them ineffective. Here, we present the factors affecting transport of noble gases and SF 6 relative to CO 2 in a porous rock. Using a porous sandstone core, each of the tracers were loaded into a sample loop and injected as discrete gas pulses into a CO 2 carrier stream at five different experiment pressures (10-50 kPag upstream to ambient pressure downstream). Tracer arrival profiles were measured using a quadrupole mass spectrometer. Significantly, our results show that peak arrival times of helium were slower than the other noble gases at each pressure gradient. The differences in peak arrival times between helium and other noble gases increased as the pressure gradient along the system decreased and the curve profiles for each noble gas differ significantly. The heavier noble gases (Kr and Xe) along with SF 6 show an earlier arrival time and a wider curve profile compared to He and Ne curves through the CO 2 carrier gas stream. This shows that Kr and Xe could be substituted for SF 6 , a potent greenhouse gas, in tracer applications. For comparison, CO 2 pulses were passed through a N 2 carrier gas resulting in significantly slower peak arrival times compared to those of noble gases and SF 6 . Hence, all investigated tracers when co-injected with CO 2 could potentially act as early warning tracers of CO 2 arrival, though we find that Kr, Xe and SF 6 will provide the most robust advance warning. Analysis of our experimental results shows that they cannot be explained by a simple one dimensional flow model through a porous medium. We outline a conceptual model that incorporates different preferential flow paths depending on flow velocities of individual gas streams. This model can explain the observed dataset and shows that the flow of noble gases and SF 6 tracers is influenced by pore-scale heterogeneity.

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Section: Tablementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Experimental determination of noble gases and SF6, as tracers of CO2 flow through porous sandstone

et al. 2018

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“…In the literature, the form drag coefficient is sometimes defined in terms of permeability and a drag force coefficient [17] as in Eq. [11].…”

Section: B Permeability and Form Drag Coefficientmentioning

confidence: 99%

Numerical Simulation of Heat Transfer in Porous Metals for Cooling Applications

Avalos-Gauna

Zhao

2017

Metall Mater Trans B

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Porous metals have low densities and novel physical, mechanical, thermal, electrical, and acoustic properties. Hence, they have attracted a large amount of interest over the last few decades. One of their applications is for thermal management in the electronics industry because of their fluid permeability and thermal conductivity. The heat transfer capability is achieved by the interaction between the internal channels within the porous metal and the coolant flowing through them. This paper studies the fluid flow and heat transfer in open-cell porous metals manufactured by space holder methods by numerical simulation using software ANSYS Fluent. A 3D geometric model of the porous structure was created based on the face-centered-cubic arrangement of spheres linked by cylinders. This model allows for different combinations of pore parameters including a wide range of porosity (50 to 80 pct), pore size (400 to 1000 lm), and metal particle size (10 to 75 lm). In this study, water was used as the coolant and copper was selected as the metal matrix. The flow rate was varied in the Darcian and Forchheimer's regimes. The permeability, form drag coefficient, and heat transfer coefficient were calculated under a range of conditions. The numerical results showed that permeability increased whereas the form drag coefficient decreased with porosity. Both permeability and form drag coefficient increased with pore size. Increasing flow rate and decreasing porosity led to better heat transfer performance.

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“…Since there is no proper equation for representing flow in the non-laminar regime, the search for a single constitutive relation continues even now [18,19].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Parallel Post-Laminar Flow through Coarse Granular Porous Media with the Wilkins Equation

et al. 2018

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Abstract:Behaviour of flow resistance with velocity is still undefined for post-laminar flow through coarse granular media. This can cause considerable errors during flow measurements in situations like rock fill dams, water filters, pumping wells, oil and gas exploration, and so on. Keeping the non-deviating nature of Wilkins coefficients with the hydraulic radius of media in mind, the present study further explores their behaviour to independently varying media size and porosity, subjected to parallel post-laminar flow through granular media. Furthermore, an attempt is made to simulate the post-laminar flow conditions with the help of a Computational Fluid Dynamic (CFD) Model in ANSYS FLUENT, since conducting large-scale experiments are often costly and time-consuming. The model output and the experimental results are found to be in good agreement. Percentage deviations between the experimental and numerical results are found to be in the considerable range. Furthermore, the simulation results are statistically validated with the experimental results using the standard 'Z-test'. The output from the model advocates the importance and applicability of CFD modelling in understanding post-laminar flow through granular media.

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Experimental flow in various porous media and reconciliation of Forchheimer and Ergun relations

Cited by 93 publications

References 40 publications

Experimental determination of noble gases and SF6, as tracers of CO2 flow through porous sandstone

Experimental determination of noble gases and SF6, as tracers of CO2 flow through porous sandstone

Numerical Simulation of Heat Transfer in Porous Metals for Cooling Applications

An Investigation of Parallel Post-Laminar Flow through Coarse Granular Porous Media with the Wilkins Equation

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