Effects on pool boiling critical heat flux (CHF) with different direction and magnitude of additional accelerations due to rolling

Tanjung, Elvira F.; Kim, Byoung Jae; Jo, Daeseong

doi:10.1016/j.anucene.2020.108095

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…The interface is calculated by the geometric reconstruction scheme. The velocity field solved by the momentum equation, Equation (2), is shared by both the liquid and vapor phases.…”

Section: Governing Equationsmentioning

confidence: 99%

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Numerical Study of the Effect of the Rolling Motion on the Subcooled Flow Boiling in the Subchannel

et al. 2022

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The marine environment may change the force on the fluid and inevitably influence bubble behavior and the two-phase flow in the reactor core, which are vital to the safety margin of a nuclear reactor. To explore the effect of the marine motion on the flow and heat transfer features of subcooled flow boiling in the reactor core, the volume of fluid (VOF) method is employed to reveal the interaction between the interface structure and two-phase flow in the subchannel under rolling motion. The variations of several physical parameters are obtained, including the transverse flow, the vapor volume fraction, the vapor adhesion ratio, and the phase distribution of boiling two-phase flow with time. Sensitivity analyses of the amplitude and the period of the rolling motion were performed to demonstrate the mechanisms of the influence of the rolling motion. We found that the transverse flow in the subchannel was mainly affected by the Euler force under the rolling motion. In contrast to the two-phase flow in the static state, the vapor volume fraction and vapor adhesion ratio show different characteristics under rolling motion. Additionally, the onset of significant void (OSV) point changes periodically under rolling motion.

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“…The interface is calculated by the geometric reconstruction scheme. The velocity field solved by the momentum equation, Equation (2), is shared by both the liquid and vapor phases.…”

Section: Governing Equationsmentioning

confidence: 99%

“…They deduced that this is because the buoyancy induced by the rolling motion was far less than the lateral component of the buoyancy induced by gravity. Tanjung et al [2] experimentally investigated the bubble behavior in the saturated pool boiling under rolling motion. The test section was installed above and below the rolling axis.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of the Rolling Motion on the Subcooled Flow Boiling in the Subchannel

et al. 2022

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“…However, few works have been done about the effects of rolling condition on pool boiling, which has also been widely applied to many boiling heat exchangers (Yu, 2020), such as steam generator, sea water evaporator, blow off evaporator, thermal deaerator, etc. Recently, (Tanjung and Jo, 2020;Tanjung et al, 2021) conducted experimental studies of pool boiling with rectangular flat heater under rolling condition. They found that vapor behaviors and CHF were opposite between the heated surface placed above and below the rolling axis.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Pool Boiling Under Ocean Condition with Lattice Boltzmann Simulation. Part Ⅱ: Rolling Condition

Zou

Liu

et al. 2021

Front. Energy Res.

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Rolling motion caused by ocean condition will induce more complicated inertial forces with their force directions changing all the time, which results more complex bubble behaviors and unique heat transfer characteristics. In this work, pool boiling under rolling condition is numerically simulated using multiple relaxation time phase change lattice Boltzmann method (LBM). Pool boiling patterns, boiling curve of time-averaged heat flux, transient heat flux and rolling effects on different pool boiling regions are investigated. The results show that pool boiling curve of time-averaged heat flux between rolling condition and static condition are not obvious until close to critical heat flux, and 9.3% higher CHF is achieved under rolling condition while worse heat transfer is discovered at film boiling. Moreover, distinct fluctuation of transient heat flux of pool boiling under rolling condition is found for all boiling regimes, and its variation pattern along with the rolling motion and bubble behavior is investigated. Furthermore, tangential inertial force caused by rolling motion has positive influence on heat transfer of pool boiling, while the centrifugal force has negative influence on heat transfer, since it is opposite to the gravity and hence decreases the buoyancy force. Besides, larger rolling amplitude and smaller rolling period will induce larger additional inertial forces, and thus make greater influences on the bubbles’ behavior and pool boiling heat transfer.

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Effects of super-hydrophilicity and orientation of heater surface on bubble behavior and the critical heat flux in pool boiling

Choi

Aziz

Shin

et al. 2023

Annals of Nuclear Energy

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Effects on pool boiling critical heat flux (CHF) with different direction and magnitude of additional accelerations due to rolling

Cited by 8 publications

References 18 publications

Numerical Study of the Effect of the Rolling Motion on the Subcooled Flow Boiling in the Subchannel

Numerical Study of the Effect of the Rolling Motion on the Subcooled Flow Boiling in the Subchannel

Numerical Investigation of Pool Boiling Under Ocean Condition with Lattice Boltzmann Simulation. Part Ⅱ: Rolling Condition

Effects of super-hydrophilicity and orientation of heater surface on bubble behavior and the critical heat flux in pool boiling

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