Published March 26, 1976 | Version v1
Report Open

Contribution to the study of transfers during condensation of vapor bubbles

Creators

Description

An experimental apparatus that allows the study of the condensation of a single vapor bubble rising in a rapidly under-cooled (by pressurization) liquid has been developed. The main experimental difficulties come from the rapidity of phenomena requiring sophisticated instrumentation (high-speed camera, signal analyzer, fast pressure sensors) and perfect synchronization of the various sequences. The results obtained are then analyzed from a global point of view (variation of the equivalent radius of the sphere of the same volume) and from a local point of view (influence of the initial shape of the bubbles and study of the instabilities). Finally, comparisons are made with the various simple theories of spherical bubbles, leading to the influence of the rise and deformation of the bubbles. The study therefore contains three chapters: - Theoretical study of the general problem and the main models. - Experimental study including the description of the apparatus, the operative technique and the presentation of the results. -Discussion of the results; analysis of results and comparison with theories

Abstract (French)

Nous avons concu un appareillage qui permet l'etude de la condensation d'une bulle de vapeur unique en ascension dans le liquide rapidement sous refroidi par pressurisation. Les principales difficultes experimentales viennent de la rapidite des phenomenes qui exigent une instrumentation perfectionnee (camera ultra-rapide, analyseur de signaux, capteurs de pression rapides) et une synchronisation parfaite des diverses sequences. Les resultats obtenus sont ensuite analyses d'un point de vue global, variation du rayon equivalent de la sphere de meme volume et d'un point de vue local, influence de la forme initiale des bulles et etude des instabilites. Enfin nous avons effectue la comparaison avec les diverses theories simples relatives a des bulles spheriques et nous pourrons conclure quant a l'influence de l'ascension et de la deformation des bulles. Notre etude comporte donc trois chapitres: - Etude theorique du probleme general et des principaux modeles. - Etude experimentale comprenant la description de l'appareillage, la technique operatoire et la presentation des resultats. -Discussion des resultats; analyse des resultats et comparaison avec les theories

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Additional details

Additional titles

Original title (French)
Contribution a l'etude des transferts lors de la condensation de bulles de vapeur

Identifiers

URL
http://www.iaea.org/inis/Contacts/;

Publishing Information

Imprint Pagination
171 p.
Report number
FRCEA-TH--9925

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
50064687
Subject category
S42: ENGINEERING;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
BUBBLES; CAMERAS; COMPARATIVE EVALUATIONS; COOLING; FLOW MODELS; GAS FLOW; HEAT TRANSFER; HYDRODYNAMICS; INTERFACES; LIQUID FLOW; MASS TRANSFER; MEASURING INSTRUMENTS; MEASURING METHODS; SHAPE; SIZE; SURFACE TENSION; THERMAL HYDRAULICS; TWO-PHASE FLOW; VAPOR CONDENSATION
Descriptors DEC
ENERGY TRANSFER; EVALUATION; FLUID FLOW; FLUID MECHANICS; HYDRAULICS; MATHEMATICAL MODELS; MECHANICS; SURFACE PROPERTIES

Optional Information

Notes
59 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Also available from Bibliotheque Universitaire de Sciences, Universite de Toulouse, 118 Route de Narbonne, 31400 Toulouse (France)