Experimental Investigation of Transitional Flow in Porous Media with Usage of a Pore Doublet Model

Khayamyan, Shervin; Gustavsson, Lennart

doi:10.1007/s11242-013-0247-6

Cited by 12 publications

(9 citation statements)

References 30 publications

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“…One consequence of this is not only that dispersion varies with Re p but also that dispersion may increase if the flow is varied in some way, periodically, for instance since varying velocity in itself changes the flow pattern substantially. The change in flow pattern can be explained with the simple set-up presented in Khayamyan et al (2014) and Khayamyan and Lundström (2015). The flow in a pore doublet model is studied, and one result is that during transitional flow in the larger pore, resistance increases and portions of the fluid are directed to the smaller pore.…”

Section: Distribution Of Time-averaged Velocity Components Within Twomentioning

confidence: 99%

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Transitional and Turbulent Flow in a Bed of Spheres as Measured with Stereoscopic Particle Image Velocimetry

et al. 2017

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Stereoscopic particle image velocimetry has been used to investigate inertia dominated, transitional and turbulent flow in a randomly packed bed of monosized PMMA spheres. By using an index-matched fluid, the bed is optically transparent and measurements can be performed in an arbitrary position within the porous bed. The velocity field observations are carried out for particle Reynolds numbers, Re p , between 20 and 3220, and the sampling is done at a frequency of 75 Hz. Results show that, in porous media, the dynamics of the flow can vary significantly from pore to pore. At Re p around 400 the spatially averaged time fluctuations of total velocity reach a maximum and the spatial variation of the time-averaged total velocity, u tot increases up to about the same Re p and then it decreases. Also in the studied planes, a considerable amount of the fluid moves in the perpendicular directions to the main flow direction and the time-averaged magnitude of the velocity in the main direction, u x , has an averaged minimum of 40% of the magnitude of u tot at Re p about 400. For Re p > 1600, this ratio is nearly constant and u x is on average a little bit less than 50% of u tot . The importance of the results for longitudinal and transverse dispersion is discussed.

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Section: Distribution Of Time-averaged Velocity Components Within Twomentioning

confidence: 99%

“…Geller and Hunt (1993), Hellström et al (2010b), Ljung et al (2012), Jourak et al (2014) and Fabricius et al (2016) and Pérez-Ràfols et al 2016). Also, experiments have been performed on simplified geometries like parallel tubes (Khayamyan et al 2014;Khayamyan and Lundström 2015).…”

Section: Introductionmentioning

confidence: 99%

Transitional and Turbulent Flow in a Bed of Spheres as Measured with Stereoscopic Particle Image Velocimetry

et al. 2017

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“…There is also some experimental work on the detailed scale. It is, for instance, clarified that the flow in an individual pore can be greatly influenced by the flow condition of neighboring pores (Khayamyan et al 2014;Khayamyan and Lundström 2015). These studies were performed on parallel tubes and with detailed measurements of the flow rate and pressure fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Transitional and Turbulent Flow in a Randomly Packed Bed of Spheres with Particle Image Velocimetry

et al. 2016

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Particle image velocimetry (PIV) has been used to investigate transitional and turbulent flow in a randomly packed bed of mono-sized transparent spheres at particle Reynolds number, 20 < Re p < 3220. The refractive index of the liquid is matched with the spheres to provide optical access to the flow within the bed without distortions. Integrated pressure drop data yield that Darcy law is valid at Re p ≈ 80. The PIV measurements show that the velocity fluctuations increase and that the time-averaged velocity distribution start to change at lower Re p . The probability for relatively low and high velocities decreases with Re p and recirculation zones that appear in inertia dominated flows are suppressed by the turbulent flow at higher Re p . Hence there is a maximum of recirculation at about Re p ≈ 400. Finally, statistical analysis of the spatial distribution of time-averaged velocities shows that the velocity distribution is clearly and weakly self-similar with respect to Re p for turbulent and laminar flow, respectively.

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“…The flow around one particle within a porous medium is studied with a pore-doublet setup, see Khayamyan et al (2014) for details. The flow geometry is represented by two straight and parallel glass pipes with diameters of 4.05 and 3.02 mm and lengths of 1100 mm.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…In fully random packing where there is no control of position or size of the pores formed the detailed geometry of most of neighboring pores affect the flow. Simplified geometries such as a unit cell (Wan 1996;Nordlund 2009) and a pore-doublet (Rose 1956;Sorbie 1995;Lundström 2008;Khayamyan et al 2014) have been used to distill the geometrical effect. Following this trend we will continue to study the pore-doublet model presented in Khayamyan et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Interaction between the Flow in Two Nearby Pores within a Porous Material during Transitional and Turbulent Flow

Khayamyan¹,

Lundström²

2015

JAFM

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The transition from laminar to turbulent flow in porous media is studied with a pore doublet model consisting of pipes with different diameter. The pressure drop over all pipes is recorded by pressure transducers for different flow rates. Results show that the flow in the parallel pipes is redistributed when turbulent slugs pass through one of them and six different flow zones were identified by studying the difference between the Re in the parallel pipes. Each flow zone starts when the flow regime of one of the pipe changes. Transitional flow of each pipe increases the correlation between different pipes pressure drop fluctuations. Frequency analysis of the pressure drops show that the larger pipe makes the system to oscillate by the presence of turbulent patches in its flow. However, when the flow in the smaller pipe enters into the transitional zone the larger pipe starts to follow the fluctuations of the smaller pipe.

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Experimental Investigation of Transitional Flow in Porous Media with Usage of a Pore Doublet Model

Cited by 12 publications

References 30 publications

Transitional and Turbulent Flow in a Bed of Spheres as Measured with Stereoscopic Particle Image Velocimetry

Transitional and Turbulent Flow in a Bed of Spheres as Measured with Stereoscopic Particle Image Velocimetry

Measurements of Transitional and Turbulent Flow in a Randomly Packed Bed of Spheres with Particle Image Velocimetry

Interaction between the Flow in Two Nearby Pores within a Porous Material during Transitional and Turbulent Flow

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