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Research Papers: Techniques and Procedures

Numerical Simulation of Droplet Size Distribution in Vertical Upward Annular Flow

[+] Author and Article Information
Y. Liu

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. Chinayang_liu@mail.dlut.edu.cn

W. Z. Li1

Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. Chinawzhongli@dlut.edu.cn

1

Corresponding author.

J. Fluids Eng 132(12), 121402 (Dec 22, 2010) (9 pages) doi:10.1115/1.4003152 History: Received March 03, 2010; Revised November 20, 2010; Published December 22, 2010; Online December 22, 2010

The liquid droplet size distribution in gas-liquid vertical upward annular flow is investigated through a CFD (computational fluid dynamics)-PBM (population balance model) coupled model in this paper. Two-fluid Eulerian scheme is employed as the framework of this model and a population balance equation is used to obtain the dispersed liquid droplet diameter distribution, where three different coalescence and breakup kernels are investigated. The Sauter mean diameter d32 is used as a bridge between a two-fluid model and a PBM. The simulation results suggest that the original Luo–Luo kernel and the mixed kernel A (Luo’s coalescence kernel incorporated with Prince and Blanch’s breakup kernel) can only give reasonable predictions for large diameter droplets. Mixed kernel B (Saffman and Turner’s coalescence kernel incorporated with Lehr’s breakup kernel) can accurately capture the particle size distribution (PSD) of liquid droplets covering all droplet sizes, and is appropriate for the description of liquid droplet size distribution in gas-liquid annular flow.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Method of CFD and PBM coupling

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Figure 2

Flow chart of iteration

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Figure 3

Comparison of d32 results that originated from different diameter classes

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Figure 4

Droplet PDF results compared with experimental data (liquid superficial velocity=0.03 m/s and gas superficial velocity=18.8 m/s)

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Figure 5

Droplet size cumulative distribution function results compared with experimental data (liquid superficial velocity=0.03 m/s and gas superficial velocity=18.8 m/s)

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Figure 6

d10, d20, d30, and d32 results of different kernels compared with experimental data (liquid superficial velocity=0.03 m/s and gas superficial velocity=18.8 m/s)

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Figure 7

d10, d20, d30, and d32 results of different kernels compared with experimental data (liquid superficial velocity=0.03 m/s and gas superficial velocity=16.1 m/s)

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Figure 8

Radial Sauter diameter distribution (liquid superficial velocity=0.03 m/s and gas superficial velocity=18.8 m/s)

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Figure 9

Radial Sauter diameter distribution (liquid superficial velocity=0.03 m/s and gas superficial velocity=16.1 m/s)

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