Insights into the dynamics of supercritical water flow using a two-phase approach

Tripathi, Piyush Mani; Basu, Saptarshi

doi:10.1063/5.0042935

Cited by 17 publications

(4 citation statements)

References 30 publications

(37 reference statements)

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“…Therefore, supercritical heat transfer in tubes can be considered a uniform heating mode. 14,67 A GL film is easily formed near the tube wall, leading to the occurrence of HTD. Zhu et al 14 proposed that the thickness of the GL film attached to the tube wall determined the occurrence of HTD.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Critical Threshold for Bubble-like Nucleation during Pseudoboiling at Supercritical Pressures

Dong,

Xu,

Wang

2024

Langmuir

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…The fluctuation of the wall temperature in most cases is much smaller than the nonuniform heating condition simulated in this paper. Therefore, supercritical heat transfer in tubes can be considered a uniform heating mode. , A GL film is easily formed near the tube wall, leading to the occurrence of HTD. Zhu et al .…”

Section: Resultsmentioning

confidence: 99%

Critical Threshold for Bubble-like Nucleation during Pseudoboiling at Supercritical Pressures

Dong,

Xu,

Wang

2024

Langmuir

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“…For the comprehension of the transcritical behavior of methane inside the cooling jacket, the pseudo-critical temperature (T pc > T cr ) should also be considered. It represents the temperature corresponding to the condition, characterized by the maximum value of the specific heat at a specific pressure [26], because can be sometimes associated with a phenomenon called heat-transfer deterioration, strictly linked to the thermal layers occurring in a cross section [26][27][28][29][30][31][32][33]. The pseudocritical temperature value raises as a function of pressure increasing, and in parallel, the specific heat peak tends to decrease.…”

Section: Transcritical Behavior Of Methane In a Lre Cooling Jacketmentioning

confidence: 99%

Transcritical Behavior of Methane in the Cooling Jacket of a Liquid-Oxygen/Liquid-Methane Rocket-Engine Demonstrator

2022

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The successful design of a liquid rocket engine is strictly linked to the development of efficient cooling systems, able to dissipate huge thermal loads coming from the combustion in the thrust chamber. Generally, cooling architectures are based on regenerative strategies, adopting fuels as coolants; and on cooling jackets, including several narrow axial channels allocated around the thrust chambers. Moreover, since cryogenic fuels are used, as in the case of oxygen/methane-based liquid rocket engines, the refrigerant is injected in liquid phase at supercritical pressure conditions and heated by the thermal load coming from the combustion chamber, which tends to experience transcritical conditions until behaving as a supercritical vapor before exiting the cooling jacket. The comprehension of fluid behavior inside the cooling jackets of liquid-oxygen/methane rocket engines as a function of different operative conditions represents not only a current topic but a critical issue for the development of future propulsion systems. Hence, the current manuscript discusses the results concerning the cooling jacket equipping the liquid-oxygen/liquid-methane demonstrator, designed and manufactured within the scope of HYPROB-NEW Italian Project. In particular, numerical results considering the nominal operating conditions and the influence of variables, such as the inlet temperature and pressure values of refrigerant as well as mass-flow rate, are shown to discuss the fluid transcritical behavior inside the cooling channels and give indications on the numerical methodologies, supporting the design of liquid-oxygen/liquid-methane rocket-engine cooling systems. Validation has been accomplished by means of experimental results obtained through a specific test article, provided with a cooling channel, characterized by dimensions representative of HYPROB DEMO-0A regenerative combustion chamber.

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“…Wang 等 [24] 通过对超临界类沸腾与亚临界沸腾换热进行对比 , 提出了超临界类沸腾三区模型 , 类液态 (liquid-like, LL)、类两相 (two-phase-like, TPL) 和类蒸汽态 (vapor-like, VL), 并表明当类蒸汽质量在0到1之间时, 不能用单相模型处理超临界传热. 闫晨帅和徐进良 [25] 对超临界CO 2 管内的流动传热特性进行了数值模拟研究, 将T pc 视为类气-类液的"相变"温度, 表明类气膜变厚, 导热热阻增大导致管道顶部壁温较大. Tripathi和Basu [26] 用拟临界温度T pc 作为饱和温度, 采用多相流VOF 模型研究超临界水流动传热恶化现象, 模拟结果合理地预测了壁面温度峰值.…”

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Numerical simulation of fluid-structure coupled heat transfer characteristics of supercritical CO2 pool heat transfer

Yu,

He,

2024

Acta Phys. Sin.

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The heat transfer of supercritical pseudo-boiling has been preliminarily studied, but the definition of gas-liquid interface is still not uniform. The fluid-structure coupling numerical simulation of heat transfer characteristics in supercritical CO2 pool was carried out using laminar flow model, Platinum wire is the heating element, d=70 μm, the qw range is 0~2000 kW/m2, the P range is 8~10 MPa, multi-scale mesh is used to model the heating wire, simulated values agree well with the experimental data. The results show that the natural convection zone is characterized by an increase in h with qw due to an increase in the circumferential average Rayleigh number Raave of the heating filament with qw. The temperatures of the four characteristic working conditions in the evaporation-like zone of the class show a decreasing trend along the r direction. Analogy with subcritical heat transfer, by calculating the thermal conductivity ratio Qcon/Qt, the supercritical is divided into three regions, T<TL is liquid-like region (LL), TL<T<TM is two-phase-like region (TPL), T>TM is vapor-like region (VL), the rule is the same as that of x partition with supercritical pseudo-boiling dryness; According to the curves of average thermal conductivity λave and thermal resistance RG with heat flux qw determined by calculating thermal conductivity ratio, the variation law of heat transfer coefficient h with qw in evaporation-like region can be well explained, as qw increases, the thermal conductivity thermal resistance RG increases, and the heat from the heating filament is difficult to be transferred to the fluid outside the vapor-like membrane, leading to a decrease in the heat transfer coefficient h when qA<qw<qC, and a significant increase in λave when qw>qC, and the recovery of heat transfer when h rises again.In this paper, a new method for determining the gas-liquid interface of supercritical pool heat transfer is proposed, which explains the heat transfer mechanism of evaporation-like zone well, and provides a theoretical basis for the development of supercritical pool heat transfer in the future.

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Insights into the dynamics of supercritical water flow using a two-phase approach

Abstract: Universal spatio-topological control of crystallization in sessile droplets using non-intrusive vapor mediation

Cited by 17 publications

References 30 publications

Critical Threshold for Bubble-like Nucleation during Pseudoboiling at Supercritical Pressures

Critical Threshold for Bubble-like Nucleation during Pseudoboiling at Supercritical Pressures

Transcritical Behavior of Methane in the Cooling Jacket of a Liquid-Oxygen/Liquid-Methane Rocket-Engine Demonstrator

Numerical simulation of fluid-structure coupled heat transfer characteristics of supercritical CO<sub>2</sub> pool heat transfer

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