Flow along porous media by partical image velocimetry

Saleh, Shawnm Mudhafar; Thovert, Jean‐François; Adler, P. M.

doi:10.1002/aic.690391104

Cited by 50 publications

(27 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fluorescent polystyrene microspheres (density at 20°C, 1.055 g cm Ϫ3 ; excitation wavelength, 580 nm; emission wavelength, 607 nm; diameter, 0.97 m; Molecular Probes, Eugene, Oreg.) were suspended in demineralized water at a final concentration of 1 ϫ 10 7 microspheres per ml (22,26,29,37). A flow chamber was positioned between two communicating vessels placed at different heights and containing the fluorescent particle suspension in order to create pulse-free flow by hydrostatic pressure.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Velocity Profiles for Different Flow Chamber Designs Used in Studies of Microbial Adhesion to Surfaces

Bakker

Plaats

Verkerke

et al. 2003

Appl Environ Microbiol

113

View full text Add to dashboard Cite

Flow chambers are commonly used to study microbial adhesion to surfaces under environmentally relevant hydrodynamic conditions. The parallel plate flow chamber (PPFC) is the most common design, and mass transport occurs through slow convective diffusion. In this study, we analyzed four different PPFCs to determine whether the expected hydrodynamic conditions, which control both mass transport and detachment forces, are actually achieved. Furthermore, the different PPFCs were critically evaluated based on the size of the area where the velocity profile was established and constant with a range of flow rates, indicating that valid observations could be made. Velocity profiles in the different chambers were calculated by using a numerical simulation model based on the finite element method and were found to coincide with the profiles measured by particle image velocimetry. Environmentally relevant shear rates between 0 and 10,000 s ؊1 could be measured over a sizeable proportion of the substratum surface for only two of the four PPFCs. Two models appeared to be flawed in the design of their inlets and outlets and allowed development of a stable velocity profile only for shear rates up to 0.5 and 500 s ؊1 . For these PPFCs the inlet and outlet were curved, and the modeled shear rates deviated from the calculated shear rates by up to 75%. We concluded that PPFCs used for studies of microbial adhesion to surfaces should be designed so that their inlets and outlets are in line with the flow channel. Alternatively, the channel length should be increased to allow a greater length for the establishment of the desired hydrodynamic conditions.

show abstract

Section: Methodsmentioning

confidence: 99%

Comparison of Velocity Profiles for Different Flow Chamber Designs Used in Studies of Microbial Adhesion to Surfaces

Bakker

Plaats

Verkerke

et al. 2003

Appl Environ Microbiol

113

View full text Add to dashboard Cite

show abstract

“…Since this location is not precisely known for the Beavers and Joseph's experiments, it hampers the analysis of the results that they obtained. This difficulty however disappears with the new experimental techniques used, for example, in Saleh et al (1993), Tachie et al (2004), andGoharzadeh et al (2005). Indeed, in these experiments, there is no divider plate.…”

Section: Beavers and Joseph's Slip Boundary Conditionmentioning

confidence: 91%

“…Regarding the jump coefficient α, many studies have focused on the determination of its value (Taylor 1971;Beavers et al 1974;James and Davis 2001). It depends strongly on the geometry of the transition region but also on the exact location of the interface Higdon 1986, 1987;Sahraoui and Kaviany 1992;Saffman 1971;Saleh et al 1993). However, no agreement on a best choice for the exact location of the interface inside the transition region has been reached.…”

Section: Introductionmentioning

confidence: 97%

Jump Conditions and Surface-Excess Quantities at a Fluid/Porous Interface: A Multi-scale Approach

Chandesris¹,

Jamet²

2008

Transp Porous Med

View full text Add to dashboard Cite

We present a two-step up-scaling approach that allows to derive the jump conditions that must be imposed at the interface to account for transport phenomena in a fluid/porous domain. This general approach is first applied to a heat conduction problem to illustrate the main steps of the analysis. The heat flux and temperature jump conditions are related to surface-excess quantities, whose values depend on the interface location. Good agreement between the mesoscopic and macroscopic results are obtained, whatever the position of the interface inside the transition region. The approach is then applied to the problem of a laminar flow over a porous medium. The Beavers and Joseph relation is recovered, but only for a particular position of the interface.

show abstract

“…Huang (2003) and Huang et al (2006) carried out a numerical investigation of flow through banks of cylinders at low Reynolds numbers, which is a first-order approximation to the flow through a forming fabric. They observed that the downstream row of cylinders had little influence on an upstream row of cylinders, provided that the surface separation between the rows is greater than 0.7 times the upstream cylinder diameter D. Saleh et al (1993) measured the flow upstream of a porous media where the flow velocity was along the surface of the porous media. They characterized the influence of the porous media on the flow field in its close proximity…”

Section: Introductionmentioning

confidence: 98%

Micro-PIV Measurement of Flow Upstream of Papermaking Forming Fabrics

2014

View full text Add to dashboard Cite

In the flow through porous media such as screens the structure of the screen affects the upstream flow field. This is relevant for filtration and deposition processes where the local filtrate deposition rate depends on the upstream flow field, while deposition also alters this flow field over time. Here, we investigate the flow through forming fabrics that retain pulp fibers during the papermaking process, while the liquid phase passes through. The associated drainage velocity through the fabric has a significant impact on the quality of the finished product. Microparticle image velocimetry (micro-PIV) was used to measure the drainage velocity distribution upstream of two different fabrics. To make measurements at the scale of the forming fabric filaments, an experimental micro-PIV procedure was developed to permit velocity measurements several millimeters into the fluid stream with a depth of correlation of 28 µm and an in-plane resolution of 40 µm × 40 µm. For the single phase flow of water, the experiments show the existence of a highly variable drainage velocity field upstream of both fabrics. The normalized standard deviation (NSD) of the velocity fields decays exponentially with distance upstream of the fabric. The decay constant is on the order of one filament diameter at moderate Reynolds numbers (Re = 52 − 140). At a constant freestream velocity, the deposition of a small number of wood fibers onto a fabric results in a higher NSD than that of the bare fabric. This is believed to be due to partial obstruction of some holes in the fabric, which leads to higher velocities through unobstructed holes. Once about 5 g per square meter of fiber has been deposited onto the fabric, the velocity field above the fabric with adhering fiber mat becomes uncorrelated with the velocity field through the bare fabric.

show abstract

Flow along porous media by partical image velocimetry

Cited by 50 publications

References 13 publications

Comparison of Velocity Profiles for Different Flow Chamber Designs Used in Studies of Microbial Adhesion to Surfaces

Comparison of Velocity Profiles for Different Flow Chamber Designs Used in Studies of Microbial Adhesion to Surfaces

Jump Conditions and Surface-Excess Quantities at a Fluid/Porous Interface: A Multi-scale Approach

Micro-PIV Measurement of Flow Upstream of Papermaking Forming Fabrics

Contact Info

Product

Resources

About