Heat transfer to supercritical pressure hydrocarbons flowing in a horizontal short tube

Yang, Zhuqiang; Bi, Qincheng; Liu, Zhaohui; Guo, Yong; Yan, Jingbo

doi:10.1016/j.expthermflusci.2014.10.024

Cited by 54 publications

(10 citation statements)

References 30 publications

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“…In the literature, many studies have been carried out on supercritical-pressure heat transfer of various hydrocarbon fuels. Zhong et al, 8 Liu et al, 10 Zhang et al, 11 Jiang et al, 12 and Yang et al 13 conducted experimental investigations on heat transfer of the heavy hydrocarbon fuels, including aviation kerosene and n-decane, under supercritical pressures. Effects of the operating pressure, wall heat flux, and inlet flow velocity were examined.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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 thermoacoustic instability at subcritical pressure is similar to that at supercritical pressure [19][20][21]. When the thermoacoustic instability occurs, the oscillations of pressure drop, wall temperature, and fuel temperature take place, accompanying abnormal sound at both subcritical and supercritical pressures.…”

Section: Resultsmentioning

confidence: 70%

“…And, much work has been done on the thermoacoustic instability at supercritical pressure [10][11][12][13][14][15][16][17][18][19][20][21]. Yang et al [20] claimed that the thermoacoustic instability was caused by the rapid collapsing and condensing of the microbubbles formed in the gasification cores of the heated tube. These pseudobubbles were found to propagate in the fluid with the speed of sound [9,22].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Mechanism of Thermoacoustic Instability of n-Decane at Subcritical Pressure

Wang

Nie

et al. 2018

AIAA Journal

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Thermoacoustic instability of n-decane at subcritical pressure in a small-scale channel is investigated from three aspects: the flow pattern, the fluctuations of temperature and pressure, and the dynamic model. The results show that the thermoacoustic instability is a type of dynamic instability and experiences three stages: that is, appearance, development, and disappearance. Oscillations happen for the pressure drop, fluid temperature, and wall temperature when thermoacoustic instability appears. The thermoacoustic instability is driven by a positive and a negative feedback. When the outlet oil temperature reaches saturation temperature, the positive feedback loop is on, and the thermoacoustic oscillation happens. After that, the flow pattern near the outlet recovers to annular flow and then transforms to a single-gas flow, which leads the thermoacoustic oscillation to happen again.

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“…Heat transfer to turbulent sCO 2 flow through horizontal pipes has also gained attention [16][17][18][19]. Different from the vertical cases, where the buoyant force is parallel to the mainstream, in horizontal pipes the buoyant force is perpendicular to the mainstream; therefore, the secondary flow would affect the heat transfer in a different way.…”

Section: Introductionmentioning

confidence: 99%

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

WANG

Yang

Gong

et al. 2022

The Journal of Supercritical Fluids

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Heat transfer to supercritical pressure hydrocarbons flowing in a horizontal short tube

Cited by 54 publications

References 30 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

Investigation on the Mechanism of Thermoacoustic Instability of n-Decane at Subcritical Pressure

A designed wall roughness approach to improve turbulent heat transfer to supercritical CO2 flowing in horizontal tubes

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