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TECHNICAL PAPERS

Turbulent Mixing of Two Immiscible Fluids

[+] Author and Article Information
Thierry Lemenand, Pascal Dupont, Dominique Della Valle

Thermofluids & Complex Flows Research Group, Laboratoire de Thermocinétique de Nantes,  CNRS UMR 6607, Rue Christian Pauc, BP 50609, F-44306 Nantes, France

Hassan Peerhossaini1

Thermofluids & Complex Flows Research Group, Laboratoire de Thermocinétique de Nantes,  CNRS UMR 6607, Rue Christian Pauc, BP 50609, F-44306 Nantes, Francehassan.peerhossaini@polytech.univ-nantes.fr

1

Corresponding author.

J. Fluids Eng. 127(6), 1132-1139 (Jun 10, 2005) (8 pages) doi:10.1115/1.2073247 History: Received November 17, 2003; Revised June 10, 2005

The emulsification process in a static mixer HEV (high-efficiency vortex) in turbulent flow is investigated. This new type of mixer generates coherent large-scale structures, enhancing momentum transfer in the bulk flow and hence providing favorable conditions for phase dispersion. We present a study of the single-phase flow that details the flow structure, based on LDV measurements, giving access on the scales of turbulence. In addition, we discuss the liquid-liquid dispersion of oil in water obtained at the exit of the mixer/emulsifier. The generation of the dispersion is characterized by the Sauter diameter and described via a size-distribution function. We are interested in a local turbulence analysis, particularly the spatial structure of the turbulence and the turbulence spectra, which give information about the turbulent dissipation rate. Finally, we discuss the emulsifier efficiency and compare the HEV performance with existing devices.

Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Heat exchanger-reactor HEV

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Figure 2

Experimental setup

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Figure 3

Emulsion samples—optical microscopy

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Figure 4

Coherent structures at Re=1500

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Figure 5

Global view of evolution of mean axial velocity profile (axis A) at Re=15,000(4)

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Figure 6

Global view of the evolution of TKE dissipation profile (axis A) at Re=10,000(5)

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Figure 7

Experimental streamlines downstream of the seventh baffle at Re=15,000 (PIV measurements)

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Figure 8

Sauter diameter versus Weber number

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Figure 9

Size distribution function in the Schwarz-Bezemer presentation

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Figure 10

Radial profiles of the rms velocity along axis B at axial locations xu, xd1, and xd7 (LDV)

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Figure 11

Pdf of the turbulent axial velocity at the axial locations xu, xd1, and xd7 in (a) the center and (b) the wake regions

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Figure 12

Normalized premultiplied spectrum of the turbulent axial velocity in the upstream flow at different radial locations on axis B (LDV)

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Figure 13

Normalized premultiplied spectra at location xd7 (axis B) according to radial locations (wake, center, and shear region) compared with upstream spectrum

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Figure 14

Profiles of turbulent dissipation rate on axis B at locations xu, xd1, and xd7. The limits of the tab location are added.

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Figure 15

Ratio of surface energy to available mechanical energy

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Figure 17

Comparative energy cost of HEV

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Figure 18

Predicted equilibrium diameter using Hesketh model Eq. 4

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