Heat transfer performance of aviation kerosene RP-3 flowing in a vertical helical tube at supercritical pressure

Wen, Jia; Huang, Haoran; Fu, Yanchen; Xu, Guoqiang; Zhu, K.

doi:10.1016/j.applthermaleng.2017.04.055

Cited by 23 publications

(10 citation statements)

References 42 publications

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“…As shown in Figure b, the wall temperature on the outer side of the wall in a helical tube can be decreased by around 200 K compared to that in a straight tube. This phenomenon is consistent with the experimental observations . As the curvature increases, heat transfer enhancement on the outer side of the tube becomes stronger.…”

Section: Resultssupporting

confidence: 92%

“…The numerical model and computational code have been validated for solving supercritical-pressure fluid flows, heat transfer, and fuel pyrolysis of various hydrocarbon fuels in straight tubes. ,, In this work, model validations are further conducted in helical tubes based on two sets of experimental data concerning supercritical-pressure heat transfer of CO 2 and RP-3 measured by Xu at al . and Wen et al Detailed operating parameters for model validations are provided in Table . Comparisons are made between the experimental data and numerical results, as shown in Figures and .…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…Very limited experimental studies exist in the literature on heat transfer of hydrocarbon fuels in helical tubes under supercritical pressures. Wen et al 31 recently conducted experiments on heat transfer of the aviation kerosene RP-3 in a helical tube at a supercritical pressure of 5 MPa. It was found that the heat transfer coefficient on the outer side of the helical tube could be increased by around 30% as a result of secondary flows.…”

Section: Introductionmentioning

confidence: 99%

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Supercritical-Pressure Heat Transfer, Pyrolytic Reactions, and Surface Coking of n-Decane in Helical Tubes

Sun

Meng

2018

Energy Fuels

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Supercritical-pressure heat transfer of a hydrocarbon fuel has practical importance in fuel precooling technology in hypersonic air-breathing propulsion systems. Heat transfer of n-decane in helical tubes is numerically studied at a supercritical pressure of 5 MPa, with consideration of endothermic fuel pyrolysis and surface carbon deposition. The effects of helical curvature on temperature variations, pyrolytic chemical reactions, and surface coking are analyzed. Results indicate that, owing to the centrifugal force and secondary flows, the averaged wall temperature in a helical tube is significantly reduced in the inlet region (x/D < 50). The fluid temperature is higher on the inner side of the helical tube, and as a result, the pyrolytic chemical reactions and heat absorption rates become correspondingly higher. With around 50% n-decane thermally decomposed at the tube exit, the bulk fluid temperature can be decreased up to 120 K. The coking precursors produced from fuel pyrolysis cause surface carbon deposition, and the coking amount on the inner side of the tube wall, with stronger fuel pyrolysis, is around twice that on the outer side. An empirical heat transfer correlation is found to work well for predicting supercritical-pressure heat transfer of n-decane in helical tubes, with or without fuel pyrolysis.

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Section: Resultssupporting

confidence: 92%

Section: Theoretical Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supercritical-Pressure Heat Transfer, Pyrolytic Reactions, and Surface Coking of n-Decane in Helical Tubes

Sun

Meng

2018

Energy Fuels

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“…The final study summarized here conducted a research on convective heat transfer characteristics of aviation kerosene RP-3 at supercritical pressure (P = 5MPa) in vertical helical tube [34]. Based on the reported results, the inside temperature is higher than the outside due to the force caused by the secondary flow centrifuge.…”

Section: Helical Coil Techniques Reviewmentioning

confidence: 99%

Heat Transfer Enhancement Using Passive Technique: Review

2021

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Preserving and saving energy have never been more important, thus the requirement for more effective and efficient heat exchangers has never been more important. However, in order to pave the way for the proposal of a truly efficient technique, there is a need to understand the shortcomings and strengths of various aspects of heat transfer techniques. This review aims to systematically identify these characteristics two of the most popular passive heat transfer techniques: nanofluids and helically coiled tubes. The review indicated that nanoparticles improve thermal conductivity of base fluid and that the nanoparticle size, as well as the concentrations of the nanoparticles plays a major role in the effectiveness of the nanofluids. Regarding the helically coiled tubes, it was discovered that the use of a coiled tube produces secondary flows, which ultimately improves the heat transfer enhancement. The third part of the review focused on microchannels and microtubes. This is mainly due to the growing need and requirement of smaller and more compact thermal cooling systems. Thus, ultimately the result of the review indicates that a combination of all these three techniques can lead to a compact and minimized heat exchanger that uses the benefits obtained from both nanofluids and helically coiled tubes in order to improve the heat transfer rate of the thermal systems.

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“…After that, the outflow high-temperature fuel is injected into the combustor as a propellant. As the pressure in the combustion chamber is higher than the fuel's critical pressure, the heat transfer of hydrocarbon fuel in regenerative cooling channels is conducted under supercritical pressures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experiments on Heat Transfer of Supercritical Pressure Kerosene in Mini Tube under Ultra-High Heat Fluxes

et al. 2020

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Heat transfer of supercritical-pressure kerosene is crucial for regenerative cooling systems in rocket engines. In this study, experiments were devoted to measure the heat transfer of supercritical-pressure kerosene under ultra-high heat fluxes. The kerosene flowed horizontally in a mini circular tube with a 1.0 mm inner diameter and was heated uniformly under pressures of 10–25 MPa, mass fluxes of 8600–51,600 kg/m2 s, and a maximum heat flux of up to 33.6 MW/m2. The effects of the operating parameters on the heat transfer of supercritical-pressure kerosene were discussed. It was observed that the heat transfer coefficient of kerosene increases at a higher mass flux and inlet bulk temperature, but is little affected by pressure. The heat transfer of supercritical-pressure kerosene is classified into two regions: normal heat transfer and enhanced heat transfer. When the wall temperature exceeds a certain value, heat transfer is enhanced, which could be attributed to pseudo boiling. This phenomenon is more likely to occur under higher heat flux and lower mass flux conditions. In addition, the experimental data were compared with several existing heat transfer correlations, in which one of these correlations can relatively well predict the heat transfer of supercritical-pressure kerosene. The results drawn from this study could be beneficial to the regenerative cooling technology for rocket engines.

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Heat transfer performance of aviation kerosene RP-3 flowing in a vertical helical tube at supercritical pressure

Cited by 23 publications

References 42 publications

Supercritical-Pressure Heat Transfer, Pyrolytic Reactions, and Surface Coking of n-Decane in Helical Tubes

Supercritical-Pressure Heat Transfer, Pyrolytic Reactions, and Surface Coking of n-Decane in Helical Tubes

Heat Transfer Enhancement Using Passive Technique: Review

Experiments on Heat Transfer of Supercritical Pressure Kerosene in Mini Tube under Ultra-High Heat Fluxes

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