Velocity Measurements of a Free-Surface Turbulent Flow Penetrating a Porous Medium Composed of Uniform-Size Spheres

Dubravka Pokrajac, Costantino Manes

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present a laboratory experimental investigation of the interaction between the turbulent flow in an open channel and the turbulent flow within its very permeable bed. The bed was composed of uniform-size spheres packed in a cubic pattern. Fluid velocities were measured by Particle Image Velocimetry (PIV), which allowed us to investigate the spatial distribution of the time-averaged flow properties in the zone where they are strongly affected by the geometry of the rough bed. We investigate the effect of bed porosity on these flow properties by comparing the results of two experimental configurations: one with an impermeable bed composed of a single layer of spheres and another with a permeable bed composed of five layers. For the latter case, PIV measurements of velocities were also carried out inside two pores adjacent to the bed surface. This data provides an insight into the mechanisms of momentum transfer between the turbulent open channel flow and the turbulent flow within its very permeable bed.

Original languageEnglish
Pages (from-to)367-383
Number of pages17
JournalTransport in Porous Media
Volume78
Issue number3
Early online date7 Feb 2009
DOIs
Publication statusPublished - Jul 2009

Keywords

  • Turbulent porous media flows
  • Rough bed open channel flows
  • Spatial flow structure
  • PIV
  • Channel flow
  • Boundary-conditions
  • Homogeneous fluid
  • Momentum-transfer
  • Rough-bed
  • Interface
  • Water
  • Wall
  • Turbulent porous media flows
  • Rough bed open channel flows
  • Spatial flow structure
  • PIV

Cite this

Velocity Measurements of a Free-Surface Turbulent Flow Penetrating a Porous Medium Composed of Uniform-Size Spheres. / Pokrajac, Dubravka; Manes, Costantino.

In: Transport in Porous Media, Vol. 78, No. 3, 07.2009, p. 367-383.

Research output: Contribution to journalArticle

@article{399d41094f684d91b59557fab36a977c,
title = "Velocity Measurements of a Free-Surface Turbulent Flow Penetrating a Porous Medium Composed of Uniform-Size Spheres",
abstract = "We present a laboratory experimental investigation of the interaction between the turbulent flow in an open channel and the turbulent flow within its very permeable bed. The bed was composed of uniform-size spheres packed in a cubic pattern. Fluid velocities were measured by Particle Image Velocimetry (PIV), which allowed us to investigate the spatial distribution of the time-averaged flow properties in the zone where they are strongly affected by the geometry of the rough bed. We investigate the effect of bed porosity on these flow properties by comparing the results of two experimental configurations: one with an impermeable bed composed of a single layer of spheres and another with a permeable bed composed of five layers. For the latter case, PIV measurements of velocities were also carried out inside two pores adjacent to the bed surface. This data provides an insight into the mechanisms of momentum transfer between the turbulent open channel flow and the turbulent flow within its very permeable bed.",
keywords = "Turbulent porous media flows, Rough bed open channel flows, Spatial flow structure, PIV, Channel flow, Boundary-conditions, Homogeneous fluid, Momentum-transfer, Rough-bed, Interface, Water, Wall, Turbulent porous media flows , Rough bed open channel flows , Spatial flow structure , PIV",
author = "Dubravka Pokrajac and Costantino Manes",
year = "2009",
month = "7",
doi = "10.1007/s11242-009-9339-8",
language = "English",
volume = "78",
pages = "367--383",
journal = "Transport in Porous Media",
issn = "0169-3913",
publisher = "Springer",
number = "3",

}

TY - JOUR

T1 - Velocity Measurements of a Free-Surface Turbulent Flow Penetrating a Porous Medium Composed of Uniform-Size Spheres

AU - Pokrajac, Dubravka

AU - Manes, Costantino

PY - 2009/7

Y1 - 2009/7

N2 - We present a laboratory experimental investigation of the interaction between the turbulent flow in an open channel and the turbulent flow within its very permeable bed. The bed was composed of uniform-size spheres packed in a cubic pattern. Fluid velocities were measured by Particle Image Velocimetry (PIV), which allowed us to investigate the spatial distribution of the time-averaged flow properties in the zone where they are strongly affected by the geometry of the rough bed. We investigate the effect of bed porosity on these flow properties by comparing the results of two experimental configurations: one with an impermeable bed composed of a single layer of spheres and another with a permeable bed composed of five layers. For the latter case, PIV measurements of velocities were also carried out inside two pores adjacent to the bed surface. This data provides an insight into the mechanisms of momentum transfer between the turbulent open channel flow and the turbulent flow within its very permeable bed.

AB - We present a laboratory experimental investigation of the interaction between the turbulent flow in an open channel and the turbulent flow within its very permeable bed. The bed was composed of uniform-size spheres packed in a cubic pattern. Fluid velocities were measured by Particle Image Velocimetry (PIV), which allowed us to investigate the spatial distribution of the time-averaged flow properties in the zone where they are strongly affected by the geometry of the rough bed. We investigate the effect of bed porosity on these flow properties by comparing the results of two experimental configurations: one with an impermeable bed composed of a single layer of spheres and another with a permeable bed composed of five layers. For the latter case, PIV measurements of velocities were also carried out inside two pores adjacent to the bed surface. This data provides an insight into the mechanisms of momentum transfer between the turbulent open channel flow and the turbulent flow within its very permeable bed.

KW - Turbulent porous media flows

KW - Rough bed open channel flows

KW - Spatial flow structure

KW - PIV

KW - Channel flow

KW - Boundary-conditions

KW - Homogeneous fluid

KW - Momentum-transfer

KW - Rough-bed

KW - Interface

KW - Water

KW - Wall

KW - Turbulent porous media flows

KW - Rough bed open channel flows

KW - Spatial flow structure

KW - PIV

U2 - 10.1007/s11242-009-9339-8

DO - 10.1007/s11242-009-9339-8

M3 - Article

VL - 78

SP - 367

EP - 383

JO - Transport in Porous Media

JF - Transport in Porous Media

SN - 0169-3913

IS - 3

ER -