Published August 26, 1983 | Version v1
Patent Metadata-only

Ultrasonic measurement process of the ratio volume of gas in an enclosure containing a gas-liquid mixture to the total volume of the enclosure

Creators

Description

Ultrasonic waves with two different frequencies are sent through the fluid in the containment. Time of propagation are measured and the difference is calculated. If propagation times are identical the gas phase forms a layer on the top of the liquid phase and void fraction is determined from propagation speeds in the gas and in the liquid. If propagation times are different, part of the gas forms bubbles and void fraction is the sum of gas on top of the liquid and gas bubbles in the liquid determined separatly. Void fraction coming from the gas over the liquid is determined by waves reflected at the interface gas-liquid. Void fraction coming from the bubbles is determined by relations between the speed of ultrasonic waves and their frequency as a function of pressure and void fraction

Availability note (English)

Available from Institut National de la Propriete Industrielle, Paris (France).

Abstract (French)

On provoque la propagation d'ondes a des frequences differentes, a travers le fluide remplissant l'enceinte. On mesure les temps de propagation des ondes et on calcule la difference entre ces temps de propagation. Si les temps de propagation sont identiques, on en deduit que tout le gaz est sous forme d'une couche surmontant le liquide. On determine le taux de vide a partir des vitesses de propagation des ultrasons dans le gaz et le liquide et du temps de propagation mesure. Si les temps de propagation sont differents, une partie du gaz est sous forme de bulles dans la vapeur, on determine separement le taux de vide du au gaz surmontant le liquide et le taux de vide du aux bulles de gaz dans le liquide. On determine le taux de vide total par addition des deux valeurs obtenues. Le taux de vide du au gaz surmontant le liquide peut etre determine grace aux ondes reflechies par l'interface gaz-liquide. Le taux de vide du aux bulles de gaz est determine grace aux relations existant entre la vitesse des ultrasons et la frequence des ondes, suivant la pression et/le taux de vide

Additional details

Additional titles

Original title (French)
Procede de mesure par ultrasons du rapport du volume de gaz present dans une enceinte contenant un melange liquide-gaz au volume total de l'enceinte
Augmented title (English)
PWR reactors

Publishing Information

Imprint Pagination
18 p.
IPC:
Int. Cl. G01n29/02; G21c17/02.
IPC
Int. Cl. G01n29/02; G21c17/02.
Patent number
FR patent document 2522153/A/

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
15013900
Subject category
S42: ENGINEERING; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
PRIMARY COOLANT CIRCUITS; PWR TYPE REACTORS; ULTRASONIC TESTING; VOID FRACTION; WAVE PROPAGATION
Descriptors DEC
ACOUSTIC TESTING; COOLING SYSTEMS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; REACTORS; TESTING; WATER COOLED REACTORS; WATER MODERATED REACTORS

Optional Information

Secondary number(s)
FR patent application 8202750.