The structure of two-phase grid turbulence in a rectangular channel: an experimental study

Papailiou, D. D.

doi:10.1016/s0301-9322(99)00085-3

Cited by 17 publications

(26 citation statements)

References 26 publications

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“…Grid turbulence energy is of the same order of magnitude with turbulence generated by the bubbles and the two mechanisms are competing, resulting in a significant increase of the turbulence intensity in all directions. The notion of competing mechanisms is also supported by spectra measurements not presented in this report [5].…”

Section: Resultssupporting

confidence: 77%

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Water Air Bubble Grid Turbulence

Papailiou

2002

Chem. Eng. Technol.

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Section: Resultssupporting

confidence: 77%

“…Mean bubble diameter and bubble slip velocity were estimated to be respectively 3 mm and 250 mm/s with photographic techniques. Details of the experimental apparatus and the techniques developed and used for data reduction can be found in Panidis and Papailiou [5].…”

Section: Experimental Set-upmentioning

confidence: 99%

Water Air Bubble Grid Turbulence

Papailiou

2002

Chem. Eng. Technol.

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“…Serizawa et al, 1975;Lance and Bataille, 1991;Shawkat et al, 2007 for the lowest void fraction). In the central part of the channel the same effects, in several cases (large tubes or grid turbulence channels -low void fractions), result in more or less uniform void and velocity distributions across large areas of the cross section (Lance and Bataille, 1991;Panidis and Papailiou, 2000), whereas (usually for larger void fractions) dome shaped profiles have been also observed (Serizawa et al, 1975;Wang et al, 1987;Shawkat et al, 2007 for higher void fractions).…”

Section: Introductionmentioning

confidence: 89%

The development of the structure of water – air bubble grid turbulence

Panidis

2011

International Journal of Multiphase Flow

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“…They believed that the study of homogeneous conditions could be of considerable (great) help in the modeling of twophase flow turbulent, as is the case in single-phase flow. In a study regarding the influence of a second dispersed phase on the structure of turbulence flow, Panidis and Papailiou [7] investigated the nearly isotropic turbulent field created behind a grid. They measured the liquid phase velocity using LDV, the local void fraction with an optical probe as well as with hot-film anemometry, and the velocity and size of the bubbles were measured with photographic techniques.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of the Mixing Characteristics in Single‐ and Two‐Phase Grid‐Generated Turbulent Flow Systems

Moghaddas¹,

Trägårdh

Östergren

et al. 2004

Chem Eng & Technol

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The mixing process is studied in grid-generated turbulent flow for single-and bubbly two-phase flow systems. Concentration and mixing characteristics in the liquid phase are measured with the aid of a PLIF/PLIF arrangement. A nearly isotropic turbulent flow field is generated at the center of the vertical pipe by using a honeycomb, three grids and a contraction. In twophase flow experiments, air bubbles were injected into the flow from a rectangular grid, with mesh size M = 6 mm, which is placed midway between two circular grids each with a mesh size of M = 2 mm. For single-phase flow, the normalized mean concentration cross-stream profiles have rather similar Gaussian shapes, and the cross-stream profiles of the normalized root-mean-square (RMS) values of concentration were found to be quite similar. Cross-stream profiles of the mean concentration, for bubbly two-phase flow, were also found to be quite similar, but they did not have the Gaussian shape of the profiles for single-phase flow. Almost self-similar behavior was also found for the RMS values of the concentration in two-phase systems. The turbulent diffusion coefficient in the liquid phase was also calculated. At the center of the plume, the flow was found to have a periodic coherent structure, probably of vortex shedding character. Observations showed that the period of oscillation is higher in the case of two-phase flow than in single-phase flow.

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The structure of two-phase grid turbulence in a rectangular channel: an experimental study

Cited by 17 publications

References 26 publications

Water Air Bubble Grid Turbulence

Water Air Bubble Grid Turbulence

The development of the structure of water – air bubble grid turbulence

A Comparison of the Mixing Characteristics in Single‐ and Two‐Phase Grid‐Generated Turbulent Flow Systems

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