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Experimental and Computational Multiphase Flow

, Volume 2, Issue 4, pp 199–211 | Cite as

A technical review of research progress on thin liquid film thickness measurement

  • Bo Wang
  • Bingzheng Ke
  • Bowen Chen
  • Ru Li
  • Ruifeng TianEmail author
Review Article
  • 165 Downloads

Abstract

The thickness of the thin liquid film and its effects have always been a research hotspot in nuclear power applications and operating nuclear power plants, because the flow phenomenon of the liquid film is extremely common in multiphase flow research. Based on papers published in recent years, novel research progress on thin film thickness is reviewed from the following two perspectives: the experimental measurement and the theoretical model of liquid film thickness. For the experimental measurement, methods mainly include the PLIF method, the capacitance method, and the ultrasonic method. The following contents in this part are mainly reviewed from the PLIF method, the capacitance method, the ultrasonic method, and other methods for the measurement of the liquid film thickness on the wall, the liquid film thickness on the tube wall, and other aspects of the liquid film thickness. For the model, the theoretical model of liquid film thickness on the wall is mainly reviewed from two aspects: vertical flow and horizontal flow. Other models are mainly reviewed from the following aspects. They are annular film thickness, liquid film thickness for gas–liquid annular flow, and film thickness in pipes.

Keywords

film thickness PLIF technology theoretical model experimental measurement capacitance method 

Nomenclature

Ar

Archimedes number

Bo

Bond number based on the bubble acceleration

C

Capacitance between two parallel conductive plates

Ca

Capillary number

Ca**

Criterion for the limit in capillary number

D

Outside diameter of tube

Di

Tube inner diameter

FrG

Froude number for gas phase

h

Liquid film thickness

It

Sum of the reflected light intensity

I0

Incident intensity

k

Spectral absorption coefficient

n1

Refractive indexes of air absorption medium

n2

Refractive indexes of liquid absorption medium

R

Reflectivity on the liquid-gas interface

Re

Liquid film Reynolds number

Q

Liquid feeding rate

S

Intertube spacing

v*

Dimensionless slip velocity

We

Weber number

WeL

Weber number for liquid phase

WeG

Weber number for gas phase

Greek symbols

α

Modification coefficient

μ

Dynamic viscosity

θ

Incident angle

β1

Circumferential angle measured from the top of the horizontal tube

β

Circumferential angle

τ

Liquid flow rate on one side per unit length of cylinder

τ1

Flow rate of the liquid on one side of the tube

ρ

Density of the liquid

ρL

Density of liquid

ρG

Density of gas

δ

Liquid film thickness

δ0

Initial liquid film thickness

εr

Dielectric constant

σ

Surface tension of the liquid

Ω

Disc spinning speed

Acronyms

CFD

Computational fluid dynamics

DLAS

Diode laser absorption spectroscopy

LCDM

Laser confocal displacement meter

LDV

Laser Doppler velocimeter

LFDM

Laser focus displacement meter

LIF

Laser induced fluorescence

PLIF

Planar laser induced fluorescence

TAB

Taylor analogy breakup

TFB

Turbulent fluidized bed

TFCI

Thin film colorimetric interferometry

WFT

Water film thickness

Subscripts

Decel

Decelerated condition

G

Gas phase

L

Liquid phase

Steady

Steady condition

Notes

Acknowledgements

The authors would like to acknowledge the financial support provided by the Ph.D. Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities, the Fundamental Research Funds for the Central Universities, the National Natural Science Foundation of China (No. 51676052), and Chinese Universities Scientific Fund.

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Copyright information

© Tsinghua University Press 2019

Authors and Affiliations

  • Bo Wang
    • 1
  • Bingzheng Ke
    • 1
  • Bowen Chen
    • 1
  • Ru Li
    • 1
  • Ruifeng Tian
    • 1
    Email author
  1. 1.Fundamental Science on Nuclear Safety and Simulation Technology LaboratoryHarbin Engineering UniversityHarbinChina

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