Clustering effects on liquid oxygen (LOX) droplet vaporization in hydrogen environments at subcritical and supercritical pressures

Meng, Hua; Yang, Vigor

doi:10.1016/j.ijhydene.2012.05.109

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…The empirical correlation proposed by Fuller is first used to obtain the binary mass diffusivity at low pressures, and then a simple corresponding-states method developed by Takahashi is applied to take into account the pressure effects. The property-evaluation methods have been extensively validated in our previous studies of heat transfer and combustion of hydrocarbon fuels at supercritical pressures. − Tests have also been made on their applicability for the aviation kerosene RP-3 …”

Section: Theoretical Formulationmentioning

confidence: 99%

Modeling and Simulation of Supercritical-Pressure Turbulent Heat Transfer of Aviation Kerosene with Detailed Pyrolytic Chemical Reactions

Meng

2015

Energy Fuels

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Regenerative cooling of the high-temperature components in propulsion and power-generation systems plays a paramount role in maintaining the systems' reliability and durability. In this paper, a mathematical model is developed for studying fluid dynamics and heat transfer characteristics of the aviation kerosene RP-3 at supercritical pressures. The model accommodates a detailed pyrolytic chemical reaction mechanism, which consists of 18 species and 24 elementary reactions (Jiang et al., Energy Fuels, 2013, 27, 2563-2577). Accurate calculations of thermophysical properties at supercritical pressures are properly incorporated. After rigorous model validations, numerical studies of turbulent heat transfer of RP-3 in a micro cooling tube at a supercritical pressure of 5 MPa are conducted under operating conditions of both constant wall heat flux and constant surface temperature to obtain fundamental understanding of the complex physicochemical processes. Results indicate that the endothermic fuel pyrolysis, which prevails once the bulk fluid temperature rises above 750 K, dictates the fluid flow and heat transfer process in the high fluid temperature region. Significant variations of the fluid thermophysical properties also make strong impacts; two scenarios of heat transfer enhancement resulting from property variations under the tested conditions are analyzed. This work has fundamental and practical implications for effective thermal management in propulsion and power-generation systems.

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Section: Theoretical Formulationmentioning

confidence: 99%

Modeling and Simulation of Supercritical-Pressure Turbulent Heat Transfer of Aviation Kerosene with Detailed Pyrolytic Chemical Reactions

Meng

2015

Energy Fuels

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“…Zhu et al [13,14] investigated heptane droplets evaporation into nitrogen environment and reported the required pressure range for the droplet evaporation reached to its diffusion mixing state. Meng and Yang [15,16] systematically studied the oxygen droplet evaporated into transcritical/supercritical hydrogen environment, with emphasis on evaporation characteristics and interaction of droplets. The results show that increasing the ambient pressure is beneficial to the evaporation of droplets and reduces the lifetime of the droplets, but the ambient temperature has little effect on droplet lifetime.…”

Section: Introductionmentioning

confidence: 99%

A molecular dynamics investigation on fuel vaporization and mixing characteristics under sub/supercritical conditions

Zhou

Zhao

et al. 2022

THERM SCI

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Molecular dynamics simulation is performed to study the influence of environmental pressure on the mixing process. Based on the OPLS-AA full-atomic potential function, the "gas-liquid-gas" simulation box model is used to study the evaporation characteristics of n-heptane at different environmental conditions. The results show that compared with the subcritical environment, the nitrogen molecules in the supercritical condition can diffuse into the liquid phase region earlier, and the temperature of the liquid phase rise faster, and then a unified supercritical fluid could be formed. Based on the density profile, a ?gas-liquid-gas? interface thickness is defined and the interface thickness is widened as the ambient pressure increase, resulting in the conventional subcritical evaporation transition to turbulent mixing process.

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A numerical study of counterflow diffusion flames of methane/air at various pressures

Meng

2014

Sci. China Technol. Sci.

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Clustering effects on liquid oxygen (LOX) droplet vaporization in hydrogen environments at subcritical and supercritical pressures

Cited by 10 publications

References 27 publications

Modeling and Simulation of Supercritical-Pressure Turbulent Heat Transfer of Aviation Kerosene with Detailed Pyrolytic Chemical Reactions

Modeling and Simulation of Supercritical-Pressure Turbulent Heat Transfer of Aviation Kerosene with Detailed Pyrolytic Chemical Reactions

A molecular dynamics investigation on fuel vaporization and mixing characteristics under sub/supercritical conditions

A numerical study of counterflow diffusion flames of methane/air at various pressures

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