Comprehensive parameter analyses on steam-air condensation at pressures up to 1.6 MPa

Bian, Haozhi; Lu, Yazhe; Li, Chunmei; Liang, Tiebo; Ding, Ming

doi:10.1016/j.nucengdes.2021.111536

Cited by 19 publications

(2 citation statements)

References 19 publications

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“…The more tremendous gas-mixture pressure cannot significantly improve the time-average condensation HTC of the system in specific air mass fraction ranges. Several steam condensation experimental correlations have been proposed in previous studies, such as Bian-Ding correlation [25], Su correlation [9], Dehbi correlation [26], Liu correlation [12] and Uchida correlation [27]. Figure 4 shows the comparisons between the current experimental data and the results calculated by the above correlations.…”

Section: Time-average Condensation Htc Vs Various Conditionsmentioning

confidence: 92%

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Li¹,

Hui

Ke³

et al. 2022

Energies

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The passive containment cooling system (PCCS) has been applied in the new generation nuclear power plant. Previous studies mainly focused on steady-state heat transfer, but the actual heat transfer of PCCS is the transient process. Thus, investigating the transient heat transfer during the containment pressure dropping is necessary. The present study proposes a time-average condensation heat transfer coefficient (time-average condensation HTC) to characterize the intensity of transient condensation heat transfer. The time-average condensation HTC is defined as the heat absorbed per unit heat transfer area and per unit wall subcooling in a unit time. Experiments were performed to research the effect of initial gas-mixture pressure and air mass fraction on transient HTC. The result showed that the more significant gas-mixture pressure and lower air mass fraction could promote the transient-state heat transfer, especially the low air mass fraction. Based on the experimental result, a detailed empirical correlation for the time-average heat transfer coefficient is developed with an error of ±20%. Another simplified empirical correlation that only includes air mass fraction is also proposed to predict the transient heat transfer roughly. Besides, research on self-sustaining stability is also conducted to evaluate the stable operation characteristic of PCCS. The system can respond quickly and then run to a new steady state after interference during the long-term operation of PCCS. The phenomenon above implies that PCCS has good self-sustaining stability.

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Section: Time-average Condensation Htc Vs Various Conditionsmentioning

confidence: 92%

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Li¹,

Hui

Ke³

et al. 2022

Energies

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“…Two key physical phenomena are involved in the research, namely the diffusion and transport of hydrogen in large space, and the influence of steam condensation on gas transport. Therefore, the model verification of these two key factors is carried out according to LSGMF experiment [5] and COAST experiment [6] respectively, as shown in Fig. 1.…”

Section: Influencing Factors For Hydrogen Transportation 31 Geometric...mentioning

confidence: 99%

Numerical Analysis of Hydrogen Transport Behavior Driven by ColdHeat Sources in Containment

Xinyan,

Li,

Zongwen

et al. 2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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When a breach occurs in a reactor and causes a severe accident, the high-temperature hydrogen gas inside the primary loop piping will be released into the large space of the containment, which will possibly seriously endanger the integrity of the containment. In order to study the gas transport behavior inside the containment after a severe accident, this paper adopts numerical simulation to establish a full-scale two-dimensional model of the containment, and comprehensively analyses the effects of different factors on the gas transport inside the containment driven by high-temperature gas from the breach and heat exchangers. The results show that factors such as breach size and direction, hydrogen concentration, and condensation on the heat exchanger surface affect the gas transport. When the gas injection velocity of the breach is large, the momentum factor plays a dominant role in hydrogen transportation; when the gas flow rate of the breach is small, the buoyancy factor has a more significant effect on hydrogen distribution. The settling effect caused by steam condensation on the surface of heat exchangers in the containment will affect the direction of flow of surrounding gas to some extent. In addition, increasing the opening of the compartment where the breach is located allows for a more even distribution of hydrogen.

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Experimental investigation of non-condensable gas effects in a natural circulation system

Jeong,

Hwang,

Kim

et al. 2023

J Mech Sci Technol

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Comprehensive parameter analyses on steam-air condensation at pressures up to 1.6 MPa

Cited by 19 publications

References 19 publications

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Numerical Analysis of Hydrogen Transport Behavior Driven by ColdHeat Sources in Containment

Experimental investigation of non-condensable gas effects in a natural circulation system

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