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Research Papers: Multiphase Flows

Effect of Large Amplitude Waves and Film Inertia on Mass Separation at a Sharp Corner

[+] Author and Article Information
Zahra Sadeghizadeh

Department of Mechanical and
Aerospace Engineering,
Missouri University of Science and Technology,
Rolla, MO 5409-0050
e-mail: zsp7c@mst.edu

James A. Drallmeier

Professor
Department of Mechanical and
Aerospace Engineering,
Missouri University of Science and Technology,
Rolla, MO 5409-0050
e-mail: drallmei@mst.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 22, 2017; final manuscript received February 23, 2018; published online March 29, 2018. Assoc. Editor: Wayne Strasser.

J. Fluids Eng 140(8), 081301 (Mar 29, 2018) (10 pages) Paper No: FE-17-1522; doi: 10.1115/1.4039514 History: Received August 22, 2017; Revised February 23, 2018

The separation of a shear-driven thin liquid film from a sharp corner is studied in this paper. Partial or complete mass separation at a sharp corner is affected by two different mechanisms: liquid film inertia, which affects liquid mass separation through force imbalance at the sharp corner, and large amplitude waves (LAW) at the interface, which contributes to liquid instability at the corner. Experimental results for liquid Ref number that varies from 100 to 300 and mean film thickness from 130 to 290 μm show that both film inertia and LAW effects correlate to mass separation results. The results suggest that while both inertia of the film substrate and LAW effects enhance the mass separation, the correlations between LAW characteristics and mass separation results provide better insight into the onset of separation and the impact of the gas phase velocity on separation for the conditions studied.

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Figures

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Fig. 1

Schematic of experimental unit

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Fig. 2

Schematic of test section

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Fig. 3

Porous surface and corner of experimental test section

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Fig. 4

Grayscale and corresponding binary high speed images of gas–liquid interface

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Fig. 5

Line-of-sight effect on interface

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Fig. 6

Numerical simulation of interface based on line-of-sight effect

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Fig. 7

Correlation between frequency of interface LAW components and peak frequency of interface FFT

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Fig. 8

Correlation between amplitude of interface largest LAW components and peak of interface FFT

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Fig. 9

FFT analysis of vinegar at Ug = 30 m/s and Qf˙=600cm3/min at different distances upstream from the corner

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Fig. 10

FFT analysis of vinegar for different liquid volume flow rates at Ug = 35 m/s and 30 mm upstream the corner

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Fig. 11

Liquid film at the point of separation

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Fig. 12

Average film thickness as calculated by rough wall model plotted with the volume of fluid model and LFD experimental results

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Fig. 13

Vinegar dimensionless FR versus liquid flow rate for different gas velocities

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Fig. 14

Vinegar mass separation versus liquid flow rate for different gas velocities

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Fig. 15

Vinegar at Qf˙=800cm3/min: (a) Ug=25 m/s, (b) Ug=30 m/s, (c) Ug=35 m/s, and (d) Ug=40 m/s

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Fig. 16

Sequential high-speed images of liquid film separation of vinegar at Ug=30m/s and Qf˙=800cm3/min

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Fig. 17

Vinegar at Ug = 30 m/s: (a) Qf˙=400cm3/min, (b) Qf˙=600cm3/min, (c) Qf˙=800cm3/min, and (d) Qf˙=1000cm3/min

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Fig. 18

Vinegar FFT peak frequency for different liquid volume flow rates and gas velocities

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Fig. 19

Vinegar FFT peak magnitude for different liquid volume flow rates and gas velocities

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Fig. 20

Threshold for the calculation of LAW count

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Fig. 21

LAW count for vinegar at different gas–liquid flow rate conditions

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Fig. 22

LAW area region upstream of the corner

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Fig. 23

LAW mass signal and the corresponding time-averaged value for vinegar at Ug = 30 m/s and Qf˙=1000cm3/min

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Fig. 24

Normalized LAW area for vinegar at different gas–liquid flow rate conditions

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Fig. 25

Mass separation correlation

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