FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W21523875> ?p ?o ?g. }

• W21523875 abstract "Full text of publication follows: Condensation heat transfer in the presence of noncondensable gases is a relevant aspect in many industrial applications, including nuclear reactors. In particular the design of nuclear reactor containments is heavily dependent on an accurate description of heat and mass transfer phenomena: after a postulated accident, the steam release into the containment atmosphere causes the pressure of the steam-air mixture to rise up to levels which are affected by condensation on the containment walls. At the present, in addition to the quantitative prediction of the phenomenon by engineering laws and correlations, normally based on the heat and mass transfer analogy and conceived for design purposes, the interest is greatly shifted towards detailed analysis by computational fluid-dynamic codes, which are capable of a mechanistic approach to the problem, at the price of a computational effort which is becoming more and more affordable as computer speed and general capabilities improve. The present work is focused on the computational analysis of the TOSQAN benchmark known as International Standard Problem (ISP) 47. In the test, air was initially present in the vessel (about 7 m{sup 3}) and steam, air and helium were injected during different phases at various mass flow rates. The thermal-hydraulic behaviour of the containment atmosphere was determined by the dominant physical phenomena: gas injection, steam condensation, heat transfer and buoyant flow. During certain phases, steady states were reached when the steam condensation rate became equal to the steam injection rate, with all boundary conditions (wall temperatures) remaining constant. The aim of the study is to contribute to the understanding of the heat and mass transfer mechanisms involved in the problem and to check the possibility to make use of a multipurpose commercial CFD code for simulating the containment transient and the mass transfer phenomena of interest in the nuclear field. The FLUENT 6 code has been applied to a two-dimensional domain configuration. In this case no correlations have used to determine the local condensation rate, but the air species balance equation has been solved in addition to the continuity, momentum energy and turbulence equations. In particular, the effect of the condensation rate through the liquid-gas interface was simulated by appropriate source terms introduced directly into the mass and energy balance equations, evaluated on the basis of the vapour concentration gradient near the tank walls. To make feasible the numerical solution of the problem by the FLUENT code, the assumption of an extremely thin film thickness was also utilised. The RNG (renormalization group theory) K-{epsilon} model was employed to describe the turbulent motion of the gas flow in the bulk region and the 'two layer' standard model was utilised for the 'near wall' region treatment. All the transients and the steady-state periods characterising the phase A of the ISP-47 have been reproduced by FLUENT, running in transient way, consuming about 2E6 s of CPU time on a Pentium 4{sub C}, 3 GHz. In the present paper the calculated time-dependent average temperature and pressure of the atmosphere inside the TOSQAN vessel have been compared with the available experimental data, obtaining a relatively good agreement. In addition, for the first two steady state periods, the following spatial data have been considered in detail and compared with the experimental ones: - vertical profiles of the atmosphere temperature, steam concentration and axial velocity; - radial profiles of the atmosphere temperature, steam concentration and axial velocity; - near wall axial velocity profile. (authors)" @default.
• W21523875 created "2016-06-24" @default.
• W21523875 creator A5015860959 @default.
• W21523875 creator A5044543422 @default.
• W21523875 date "2005-07-01" @default.
• W21523875 modified "2023-09-24" @default.
• W21523875 title "Computational analysis of vapour condensation in presence of air in the TOSQAN facility" @default.
• W21523875 hasPublicationYear "2005" @default.
• W21523875 type Work @default.
• W21523875 sameAs 21523875 @default.
• W21523875 citedByCount "2" @default.
• W21523875 crossrefType "journal-article" @default.
• W21523875 hasAuthorship W21523875A5015860959 @default.
• W21523875 hasAuthorship W21523875A5044543422 @default.
• W21523875 hasConcept C116915560 @default.
• W21523875 hasConcept C121332964 @default.
• W21523875 hasConcept C127413603 @default.
• W21523875 hasConcept C174379495 @default.
• W21523875 hasConcept C200093464 @default.
• W21523875 hasConcept C39432304 @default.
• W21523875 hasConcept C50517652 @default.
• W21523875 hasConcept C51038369 @default.
• W21523875 hasConcept C541523362 @default.
• W21523875 hasConcept C57879066 @default.
• W21523875 hasConcept C97355855 @default.
• W21523875 hasConceptScore W21523875C116915560 @default.
• W21523875 hasConceptScore W21523875C121332964 @default.
• W21523875 hasConceptScore W21523875C127413603 @default.
• W21523875 hasConceptScore W21523875C174379495 @default.
• W21523875 hasConceptScore W21523875C200093464 @default.
• W21523875 hasConceptScore W21523875C39432304 @default.
• W21523875 hasConceptScore W21523875C50517652 @default.
• W21523875 hasConceptScore W21523875C51038369 @default.
• W21523875 hasConceptScore W21523875C541523362 @default.
• W21523875 hasConceptScore W21523875C57879066 @default.
• W21523875 hasConceptScore W21523875C97355855 @default.
• W21523875 hasLocation W215238751 @default.
• W21523875 hasOpenAccess W21523875 @default.
• W21523875 hasPrimaryLocation W215238751 @default.
• W21523875 hasRelatedWork W1126382204 @default.
• W21523875 hasRelatedWork W1628596440 @default.
• W21523875 hasRelatedWork W1639284795 @default.
• W21523875 hasRelatedWork W1970668850 @default.
• W21523875 hasRelatedWork W1994224403 @default.
• W21523875 hasRelatedWork W1994662507 @default.
• W21523875 hasRelatedWork W2018305017 @default.
• W21523875 hasRelatedWork W2053233889 @default.
• W21523875 hasRelatedWork W2067629265 @default.
• W21523875 hasRelatedWork W2067791247 @default.
• W21523875 hasRelatedWork W2085125897 @default.
• W21523875 hasRelatedWork W2085586215 @default.
• W21523875 hasRelatedWork W2106230154 @default.
• W21523875 hasRelatedWork W2235290922 @default.
• W21523875 hasRelatedWork W2249989506 @default.
• W21523875 hasRelatedWork W2344427856 @default.
• W21523875 hasRelatedWork W2547076539 @default.
• W21523875 hasRelatedWork W2982096515 @default.
• W21523875 hasRelatedWork W3046451007 @default.
• W21523875 hasRelatedWork W3178799905 @default.
• W21523875 isParatext "false" @default.
• W21523875 isRetracted "false" @default.
• W21523875 magId "21523875" @default.
• W21523875 workType "article" @default.