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Journal of Scientific Research and  Studies

Journal of Scientific Research and Studies Vol. 5(2), pp. 46-57, February, 2018

ISSN 2375-8791

Copyright © 2018

Author(s) retain the copyright of this article


Full Length Research Paper

Analysis of flow of dye tracer plumes at the near-wall region using 7 mm Plexiglas beads


Okuroghoboye Diepreye Itugha1, Emmanuel Edward Jumbo2 and Emmanuel Munakurogha Adigio2*

1Civil & Electrical/Electronic Engineering Department, Federal University Otuoke, Otuoke, Nigeria.
2Mechanical/Marine Engineering Departments, Niger Delta University, Nigeria.

*Corresponding author. E-mail:

Accepted 26 February, 2018




A porous bed setting with synthetic spherical beads of 7.0 mm was investigated in a flume bath. The cavity region of the flat plate was attached to the oscillatory mechanism in the flume bath where plume activities were monitored during the experiments. During the oscillatory flow, the crest of roughness elements induce elevation zones to force (advection) the flow upwards and pull it down at the trough phases as the tracer plume scales over the obstacles, establishing low and high pressure zones in the flow. The enhanced particles in the process mix and dissolve or decay faster with increasing oscillatory frequency, resulting into inter-particle collisions that initiate the conditions of advection and shear dispersion. Earlier studies had attributed the pressure build-up as a consequence of the oscillatory mechanism. It was affirmed that the fluid’s kinetic energy penetrating the porous medium increases with Darcy number which is dependent on the geometric structure of the roughness elements. This study viewed the phenomenon as a combination or coupling of the processes of gradient fluctuation enhanced through dispersion due to pressure forcing in and out of the macroscopic pore-fluid field caused by the oscillatory motion. The lightening as the dye-particles cascade in the porous medium can be associated to mixing-gain due to the enhanced oscillatory motion. Hydraulic conductivity was considered to increase with increasing pore-size and rates of tracer particle interactions within the cavities. Increasing the depth of tracer-blob entrapment also affected the friction velocity to decrease relatively. As the position of the tracer blob is shifted through the porous preforms from the top towards the bottom, the friction velocity increases with the oscillatory velocity.

Key words: Interstitial hydraulic, near-wall-flow, oscillatory rig, Plexiglas, porous flatbed.

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Vol. 5 Issue 2

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