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Performance analysis of plate-type vapor–liquid separators with groove used in marine desalination

  • Ling Huang
  • Dong Han
  • Weifeng He
  • Khivishta Boodhoo
Technical Paper
  • 54 Downloads

Abstract

Taking vapor–liquid separators used in marine desalination as objects, a novel kind of plate-type vapor–liquid separator with groove is designed to achieve a more prominent separation effect. The Eulerian–Lagrangian approach is applied to simulate the two-phase flow in the separator. The SST κω turbulence model is utilized to simulate the continuous phase, and discrete phase model (DPM) is employed to calculate the water droplet distribution and the corresponding trajectories, which is verified by the experimental results from the literature. The impacts from the groove height, width and depth on the separator performance are studied. Furthermore, to acquire the optimal geometry of the separators with groove, a dimensionless objective function considering the space size, separation efficiency and pressure drop is proposed, and the corresponding prediction model is established based on the response surface methodology. Compared to the traditional type, the computational fluid dynamic (CFD) simulation results show that a higher velocity and bigger circulation region contribute to a much more comprehensive performance in the proposed separator. After determining the optimal values for all the parameters, a discrepancy value of 5.2% between the simulation results and the prediction value is attained, which indicates that the prediction model is applicable to guide the design of the separator. Further study shows that the optimal novel separator guarantees the separation efficiency with much smaller size compared with the original one.

Keywords

Vapor–liquid separator Groove Computational fluid dynamic (CFD) Response surface methodology (RSM) Optimization 

List of symbols

A

Lateral area (mm2)

a1,a2,a3

Constants

CD

Drag force coefficient

D

Groove depth (mm)

Dω

Cross-diffusion term(kg/m3s2)

d

Diameter (mm)

e

Error

F

Additional force per particle mass (N)

g

Gravity acceleration (m/s2)

Gκ

Generation of κ (kg/ms2)

Gω

Generation of ω (kg/m3s2)

H

Groove height (mm)

m

Mass (kg)

Ob1

The difference of η and Δp

Ob2

Objective function

Δp

Pressure drop (Pa)

P

Plate pitch (mm)

Re

Reynolds number

Rep

Relative Reynolds number

Sκ

Source terms of κ (kg/ms2)

Sω

Source terms of ω (1/s)

t

Time (s)

u, v

Velocity (m/s)

x, y

Directions

X

Variables

Yκ

Dissipation of κ (kg/ms2)

Yω

Dissipation of ω (kg/m3s2)

Greek letters

α

Turning angle (°)

β

Coefficient

η

Separation efficiency

κ

Turbulence kinetic energy (m2/s2)

μ

Dynamic viscosity (Pa s)

μt

Turbulent viscosity (Pa s)

σκ

Turbulent Prandtl number of κ

σω

Turbulent Prandtl number of ω

ω

Specific dissipation rate of κ (1/s)

ρ

Density(kg/m3)

Subscripts

p

Particle

i,j,k

Indexes

max

Maximum

Notes

Acknowledgements

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Grant No. 51406081) and China Postdoctoral Science Foundation (Grant No. 2016M601801).

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  • Ling Huang
    • 1
  • Dong Han
    • 1
  • Weifeng He
    • 1
  • Khivishta Boodhoo
    • 1
  1. 1.College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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