NUMERICAL ANALYSIS OF NUCLEATE BOILING FLOW IN A PILOT-SCALE THERMOSIPHON | Zendy

Bruna Iten Bittelbrunn | Zendy; Roberto Fischer | Zendy; Harlley Henrique Parno | Zendy; Henry França Meier | Zendy; Jaci Carlos Schramm Câmara Bastos | Zendy

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NUMERICAL ANALYSIS OF NUCLEATE BOILING FLOW IN A PILOT-SCALE THERMOSIPHON

Author(s) -

Bruna Iten Bittelbrunn,

Roberto Fischer,

Harlley Henrique Parno,

Henry França Meier,

Jaci Carlos Schramm Câmara Bastos

Publication year - 2020

Publication title -

anais do ... simpósio paranaense de modelagem, simulação e controle de processos

Language(s) - English

Resource type - Conference proceedings

ISSN - 1984-7521

DOI - 10.5380/simproc4.2019.art04

Subject(s) - thermosiphon , nucleate boiling , buoyancy , boiling , natural circulation , mechanics , thermodynamics , multiphase flow , heat transfer , materials science , evaporation , heat flux , physics

Thermosiphons, or natural circulation loops, are circuits in which a flow pattern is driven by buoyancy forces originated from density differences, a consequence of temperature gradient. In this study, an evaporation section was evaluated by numerical simulations, in order to determine heat flux conditions for a pilot-scale thermosiphon. A two-fluid Eulerian-Eulerian model was used to represent multiphase fluid dynamic, including heat transfer and phase change effects. The results showed that a 1000 W rate is enough to generate a nucleate boiling regime. Rates up to 2000 W produce a mean vapor volume fraction greater than 0.30 at boiling region. As a result, the pilot-scale thermosiphon was designed with four 500 W electrical resistances. Keywords: Pilot-scale thermosiphon. Nucleate boiling. CFD.

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