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

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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 B M, which is useful in describing heat transfer associated with two-phase flow.

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Abbreviations

B M :

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

R TOSQAN :

TOSQAN radius

s :

local saturation ratio

\( \overline S \) :

average saturation ratio

t :

Time

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

mean temperature

T :

temperature

V sump :

sump volume

V TOSQAN :

TOSQAN volume

\( \bar V \) :

mean radial velocity of gas

X :

volume fraction

Y :

mass fraction

τ phase :

phase-change characteristic time

τ entr :

entrainment characteristic time

τ conv :

convective heat transfer characteristic time

ρ :

density

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

Sc :

Schmidt number

Sh :

Sherwood number

Nu :

Nusselt number

Pr :

Prandlt number

Re :

Reynolds number

GRR:

global rainbow refractometry

MS:

mass spectroscopy

PDA:

phase Doppler anemometry

PIV:

particle imaging velocimetry

SRSS:

spontaneous Raman scattering spectroscopy

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Authors and Affiliations

  1. Institut de Radioprotection et de Sûreté Nucléaire, Saclay, France

    P. Lemaitre & E. Porcheron

  2. BP 68-91190, Gif sur Yvette, France

    E. Porcheron

Authors
  1. P. Lemaitre
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  2. E. Porcheron
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Correspondence to P. Lemaitre.

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Lemaitre, P., Porcheron, E. Analysis of heat and mass transfers in two-phase flow by coupling optical diagnostic techniques. Exp Fluids 45, 187–201 (2008). https://doi.org/10.1007/s00348-008-0519-z

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