Dynamic coking simulation of supercritical n-decane in circular tubes

Zhang, Chen; Gao, Hui; Zhao, Jiajun; Zhou, Jianjun; Ma, Xiaolong; Wen, Dongsheng

doi:10.1016/j.fuel.2022.125859

Cited by 18 publications

(5 citation statements)

References 53 publications

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“…The dynamic mesh with mono-directional motion was used based on a 2D structure. The similar work was also conducted by Zhang et al [9] . Later, to break the dimensional limits, a shrinking motion with hybrid mesh construction [10] was proposed to describe the coking behavior in 3D rectangular channels with the consideration of the buoyancy effect.…”

Section: Introductionsupporting

confidence: 63%

“…The dynamic mesh technique embedded in ANSYS Fluent is used to describe the thickening of the coke deposit. The nodes on the fluid-solid interface move mono-directionally to form the deposited layer [9] , as illustrated in Figure 2 (A). With the moving of the interface, the solid zone is stretched, forming the deposit layer.…”

Section: Ray Methodsmentioning

confidence: 99%

“…The MC-II coking model [6] is used to describe two types of coking in this study. The validation of the pyrolysis model and its coupling with the coking model has been performed in our previous study [9] .…”

Section: Chemical Reactions and Thermophysical Propertiesmentioning

confidence: 99%

“…In this study, the density, specific heat, thermal conductivity, and viscosity of n-decane and its pyrolytic products are calculated by the software SUPERTRAPP [12] from NIST. The deposit coke is considered a porous material with a pure coke matrix [9] . The tube is made of metal alloy GH3128, and its thermophysical properties are defined according to the standard database.…”

Section: Chemical Reactions and Thermophysical Propertiesmentioning

confidence: 99%

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A novel ray method for the coking of n-decane in circular tubes with flexible cross-section area

Zhang,

Gao,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

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Coking of endothermic hydrocarbon fuels significantly deteriorates the efficiency of regenerative cooling for hypersonic airbreathing vehicles. A novel ray method based on dynamic mesh techniques is proposed to describe the coking behavior in a circular tube with a flexible cross-section area. This method can be used to identify metal and deposit coke efficiently, which promotes the applicability of the dynamic mesh method in flexible structures. The cooling performance of n-decane before and after coking is numerically simulated and compared. The deposition brings higher thermal risks by elevating the solid temperature. However, the deposition reduces the channel’s cross-sectional area and increases the flow speed, leading to decreased flow residence time. Because the suppressing effect from lower flow residence time outweighs the promotion effect from increased temperature, the n-decane conversion decreased after coking.

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Section: Introductionsupporting

confidence: 63%

Section: Ray Methodsmentioning

confidence: 99%

Section: Chemical Reactions and Thermophysical Propertiesmentioning

confidence: 99%

Section: Chemical Reactions and Thermophysical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

A novel ray method for the coking of n-decane in circular tubes with flexible cross-section area

Zhang,

Gao,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

Self Cite

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show abstract

“…However, the regenerative cooling system application is restricted by a shortage of cooling capabilities. Hence, many optimized structures of cooling channel have been designed to enhance regenerative cooling performance, and the detailed endothermic hydrocarbon fuel flow characteristics and heat transfer characteristics in the optimized cooling tubes have been investigated via computational fluid dynamic (CFD) simulation [3,4]. The cross-section optimization of regenerative cooling tubes, which significantly affects the cooling performance of regenerative cooling systems, has received extensive attention [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow and heat transfer characteristics of supercritical endothermic hydrocarbon fuel in taper tube

Zhao,

Gao,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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To enhance the cooling performance of the scramjet regenerative cooling system, a novel taper tube is proposed. Under supercritical pressure, the flow characteristics and heat transfer characteristics of endothermic hydrocarbon fuel (EHF) in taper tube, narrow cylindrical tube, and wide cylindrical tube are numerical investigated and compared. The results of the investigation of flow and heat transfer processes in the above three tubes indicate that the taper tube effectively facilitates the pyrolysis of n-decane and the n-decane conversion is increased by 3.94%, compared with narrow cylindrical tube. Compared with wide cylindrical tube, the taper tube enhances cooling effect and the wall temperature near the outlet is reduced by 50.16 K. The taper tube contributes to the cooling structure optimization and promotion of regenerative cooling system performance.

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Numerical Simulation About Transient Performance of Regenerative Cooling System for Combustion Chamber

Zhang,

Gao,

Zhao

et al. 2024

Green Energy and Technology

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Dynamic coking simulation of supercritical n-decane in circular tubes

Cited by 18 publications

References 53 publications

A novel ray method for the coking of n-decane in circular tubes with flexible cross-section area

A novel ray method for the coking of n-decane in circular tubes with flexible cross-section area

Numerical analysis of flow and heat transfer characteristics of supercritical endothermic hydrocarbon fuel in taper tube

Numerical Simulation About Transient Performance of Regenerative Cooling System for Combustion Chamber

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