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

Abstract

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.

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

“…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.…”

“…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).…”

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

“…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.…”

Numerical Investigation of the Effect of Curvature and Reynold's Number to Radial Velocity in a Curved Porous Pipe

“…The Darcy or creeping flow regime is valid for the Reynolds number Re <10, Khayamyan and Lundstrom [12], where Re is based on pore diameter i.e., dv Re ρ = µ…”

“…The curvature δ is a more detailed measure of the effect of geometry and the extent to which the centrifugal force varies on the cross-section. Curvature affects the balance of inertia, viscous and centrifugal forces [11][12][13][14][15].…”