Experiments in Fluids

, 45:187 | Cite as

Analysis of heat and mass transfers in two-phase flow by coupling optical diagnostic techniques

Review Article

Abstract

During the course of a hypothetical accident in a nuclear power plant, spraying might be actuated to reduce static pressure in the containment. To acquire a better understanding of the heat and mass transfers between a spray and the surrounding confined gas, non-intrusive optical measurements have to be carried out simultaneously on both phases. The coupling of global rainbow refractometry with out-of-focus imaging and spontaneous Raman scattering spectroscopy allows us to calculate the local Spalding parameter BM, which is useful in describing heat transfer associated with two-phase flow.

List of symbols

Latin symbols

BM

Spalding parameter

Cp

heat capacity

d

diameter

D

diffusion coefficient

k

conductivity

L

latent heat

M

molar mass

\( \dot m \)

mass flow rate at the droplet interface

n

number of moles

P

TOSQAN absolute pressure

RTOSQAN

TOSQAN radius

s

local saturation ratio

\( \overline S \)

average saturation ratio

t

Time

\( \overline T _{{}}^{{_{{}}^{{}} }} \)

mean temperature

T

temperature

Vsump

sump volume

VTOSQAN

TOSQAN volume

\( \bar V \)

mean radial velocity of gas

X

volume fraction

Y

mass fraction

Greek symbols

τphase

phase-change characteristic time

τentr

entrainment characteristic time

τconv

convective heat transfer characteristic time

ρ

density

List of subscripts

air

relative to dry air

drop

relative to the droplet

int

relative to the droplet interface

gas

relative to the gas mixture

sat

relative to the saturation state

steam

relative to steam

sump

relative to the sump zone

TOSQAN

relative to the TOSQAN entire volume

Water

relative to water in liquid phase

List of dimensionless numbers

Sc

Schmidt number

Sh

Sherwood number

Nu

Nusselt number

Pr

Prandlt number

Re

Reynolds number

List of acronyms

GRR

global rainbow refractometry

MS

mass spectroscopy

PDA

phase Doppler anemometry

PIV

particle imaging velocimetry

SRSS

spontaneous Raman scattering spectroscopy

References

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Institut de Radioprotection et de Sûreté NucléaireSaclayFrance
  2. 2.Gif sur YvetteFrance

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