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Thomas Frank (1)

, Amine Ben

Florian Kaiser

(2) TU M

Abstract

The paper covers the project results of ANSYS Germany in a 3

for the Prediction of Critical Heat Flux

predictive capabilities of ANSYS CFD for the coverage of flow regimes from nucleate subcooled

boiling up to flow conditions close to critical heat flux (CHF). The paper will provide an insight in the

chosen Eulerian multiphase flow modeling concepts and their application to two different test

facilities and experiments with comparison to validation data.

involves the combination of conjugate heat transfer (CHT), the extended RPI wal

together with discrete population balance and flow regime transition modeling, commonly known as

the inhomogeneous MUSIG model.

The first studied application case

Thermodynamics for convective wall boiling of a NOVEC 649 refrigerant heated by a massive Copper

heater under atmospheric pressure conditions. As a second validation experiment the derived ANSYS

CFD modeling has been applied to first available experimental data from t

at KIT, Inst. Thermal Process Technology for investigation of flow conditions close to CHF for a water

water vapor system under moderate pressure of up to 2

insight in the established state

predictive capabilities and will provide an outlook for possible future development.

Fig. 1: Temperature distribution in Zirconium alloy heater rod, circular annulus fluid domain and

outer Duran glas wall of the COSMOS

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onditions for onditions for onditions for onditions for TTTTest est est est FFFFacilities with acilities with acilities with acilities with VVVVertical ertical ertical ertical HHHHeaterseaterseaterseaters

Amine Ben Hadj Ali (1)

, Conxita Lifante (1)

, Moritz Bruder

Florian Kaiser(3)

, Henning Eickenbusch (1)

(1) ANSYS Germany GmbH

TU München, Lehrstuhl für Technische Thermodynamik

(3) KIT / IKET

covers the project results of ANSYS Germany in a 3-years R&D consortium

for the Prediction of Critical Heat Flux – NUBEKS”, where the main goal was the improvement of

predictive capabilities of ANSYS CFD for the coverage of flow regimes from nucleate subcooled

boiling up to flow conditions close to critical heat flux (CHF). The paper will provide an insight in the

rian multiphase flow modeling concepts and their application to two different test

facilities and experiments with comparison to validation data. The CFD simulation methodology

involves the combination of conjugate heat transfer (CHT), the extended RPI wal

together with discrete population balance and flow regime transition modeling, commonly known as

the inhomogeneous MUSIG model.

studied application case is the test facility operated by the TU Munich, Dept. Techn

cs for convective wall boiling of a NOVEC 649 refrigerant heated by a massive Copper

heater under atmospheric pressure conditions. As a second validation experiment the derived ANSYS

CFD modeling has been applied to first available experimental data from the COSMOS

at KIT, Inst. Thermal Process Technology for investigation of flow conditions close to CHF for a water

water vapor system under moderate pressure of up to 2-3 bar. The presentation will provide an

insight in the established state-of-the-art of wall boiling prediction by means of CFD, its current

predictive capabilities and will provide an outlook for possible future development.

Fig. 1: Temperature distribution in Zirconium alloy heater rod, circular annulus fluid domain and

er Duran glas wall of the COSMOS-L test facility for step-wise increased wall heat flux up to CHF.

FFFFlux lux lux lux (CHF) (CHF) (CHF) (CHF)

eaterseaterseaterseaters

Moritz Bruder (2)

,

r Technische Thermodynamik

years R&D consortium “CFD Methods

, where the main goal was the improvement of

predictive capabilities of ANSYS CFD for the coverage of flow regimes from nucleate subcooled

boiling up to flow conditions close to critical heat flux (CHF). The paper will provide an insight in the

rian multiphase flow modeling concepts and their application to two different test

The CFD simulation methodology

involves the combination of conjugate heat transfer (CHT), the extended RPI wall boiling model

together with discrete population balance and flow regime transition modeling, commonly known as

test facility operated by the TU Munich, Dept. Technical

cs for convective wall boiling of a NOVEC 649 refrigerant heated by a massive Copper

heater under atmospheric pressure conditions. As a second validation experiment the derived ANSYS

he COSMOS-L test facility

at KIT, Inst. Thermal Process Technology for investigation of flow conditions close to CHF for a water-

3 bar. The presentation will provide an

art of wall boiling prediction by means of CFD, its current

predictive capabilities and will provide an outlook for possible future development.

Fig. 1: Temperature distribution in Zirconium alloy heater rod, circular annulus fluid domain and

wise increased wall heat flux up to CHF.