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Initial entrained fraction at onset of annular flow
KTH, Superseded Departments (pre-2005), Physics. KTH, School of Industrial Engineering and Management (ITM), Energy Technology. KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.ORCID iD: 0000-0001-5595-1952
2019 (English)In: 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 20192019,, 2019, p. 1023-1034Conference paper, Published paper (Refereed)
Abstract [en]

One of the frequently employed current models to predict the occurrence of dryout in boiling annular flows is using conservation equations to determine the liquid film mass flux. The accuracy of predictions of dryout depends to a large extend on the initial conditions, which are employed in the model. In this paper it is shown that the accuracy of predictions can be significantly improved if the initial entrained fraction of liquid is correlated to the flow conditions at the onset of annular flow. Using experimental data for liquid film flow rates in pipes with variable power distributions, a new closure relationship for the initial entrained fraction of liquid at the onset of annular flow is proposed.

Place, publisher, year, edition, pages
2019. p. 1023-1034
National Category
Mechanical Engineering Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268323Scopus ID: 2-s2.0-85073715098OAI: oai:DiVA.org:kth-268323DiVA, id: diva2:1413385
Conference
18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019; Marriott Portland Downtown WaterfrontPortland; United States; 18 August 2019 through 23 August 2019
Note

QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved

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Scopushttps://nureth2018conference.wordpress.com/

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Anglart, Henryk

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