Numerical study of interfacial dynamics in flow boiling of R134a inside smooth and structured tubes

Darshan, M B; Kumar, Ravi; Das, Arup Kumar

doi:10.1016/j.ijheatmasstransfer.2022.122592

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…Furthermore, the volume of fluid (VOF) scheme is used to simulate the free surface [16,[33][34][35][36] . In this research, the QUICK discretization scheme was used for Momentum, the First order upwind discretization scheme was used for turbulent kinetic energy and turbulent dissipation rate, the Presto discretization scheme was used for Pressure, and the PISO algorithm was used as Pressure-Velocity Coupling Method.…”

Section: Table 2 Constants Of the Rng K-ε Modelmentioning

confidence: 99%

Numerical research on biomass wastewater treatment using double-partition vessel with off-centered impellers

Zhang¹,

Yang²,

Wen-min³

et al. 2023

International Journal of Agricultural and Biological Engineering

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Limited by single function, it is difficult for the traditional stirred vessels to meet the requirements of mixing system in biomass wastewater treatment processes. The estimation of biomass wastewater stirring reactor performance by computational fluid dynamics (CFD) during multiphase reactions is important, due to the uncertainty in the numerical results. In this study, a novel double-partition stirred vessel with eccentrically located impellers was developed for the special subject. In addition, many simulations were carried out with the wastewater from biomass ethanol production as the medium to ensure the high reactor performance. The fluid flow was simulated and analyzed using the turbulent RNG k-ε model and multi reference frames. A good agreement is found between the simulation results and the confirmatory experiment. Moreover, the weir crest and interconnected pore were specially designed for the establishment of the circulation of fluid to maintain different technological conditions in the two regions. The distributions of radial velocities and tangential velocities were concentrated near the stirring blade. From the velocity profile, it is deduced that the flow pattern in the stirred vessel is insensitive to Reynolds number. Finally, this simulation study could contribute to the improvement and optimization of the structure, as well as the operation of the novel stirred vessel.

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Section: Table 2 Constants Of the Rng K-ε Modelmentioning

confidence: 99%

Numerical research on biomass wastewater treatment using double-partition vessel with off-centered impellers

Zhang¹,

Yang²,

Wen-min³

et al. 2023

International Journal of Agricultural and Biological Engineering

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show abstract

“…This increased the possibility of two-phase choking. Darshan et al [22] found that the boiling performance in the dimpled tube is better than that in the plain tube because the cavities on the heated surface promoted the initiation of bubble nucleation and contributed to the increase in nucleation sites. In addition, the departure frequency in the dimpled tube was larger than that in the plain tube.…”

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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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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Study of enhanced heat transfer performance of subcooled and saturated flow boiling with R365mfc on sintered porous coating high heat flux tubes

Wang,

Zhang,

Cheng

et al. 2024

Applied Thermal Engineering

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Numerical study of interfacial dynamics in flow boiling of R134a inside smooth and structured tubes

Cited by 7 publications

References 35 publications

Numerical research on biomass wastewater treatment using double-partition vessel with off-centered impellers

Numerical research on biomass wastewater treatment using double-partition vessel with off-centered impellers

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

Study of enhanced heat transfer performance of subcooled and saturated flow boiling with R365mfc on sintered porous coating high heat flux tubes

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