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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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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DOI: https://doi.org/10.1007/s00348-008-0519-z