Simplification of pyrolytic reaction mechanism and turbulent heat transfer of n-decane at supercritical pressures

Ruan, Bo; Meng, Hua; Yang, Vigor

doi:10.1016/j.ijheatmasstransfer.2013.10.045

Cited by 70 publications

(37 citation statements)

References 30 publications

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“…In another recent paper [13], Urbano and Nasuti studied flow and wall heat flux conditions for the occurrence of heat transfer deterioration for varied light hydrocarbons including methane, ethane and propane. More recently, Ruan et al [14] calculated turbulent flow and heat transfer of n-decane with pyrolytic reaction at supercritical pressures. Very limited studies about heat transfer of supercritical hydrocarbon fuels such as kerosene or diesel have been reported, of which the majority are experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Dang

Zhong

Zhang

et al. 2015

International Journal of Heat and Mass Transfer

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a b s t r a c tTurbulent flow and convective heat transfer of supercritical kerosene flow in an axisymmetrically heated circular tube with a diameter of 2 mm and at a mass flow rate range of 0.0015-0.015 kg/s and a wall heat flux range of 0.15-2.0 MW/m 2 are numerically studied using Reynolds averaged Navier-Stokes method with a two-layer turbulence model. The thermophysical and transport properties of kerosene are determined by a 10-species surrogate with the Extended Corresponding State method. Mesh dependency is first investigated and numerical results of fuel and wall temperatures are compared with experimental data for validations. The results show that flow properties such as velocity and Reynolds number increase significantly along the axial direction as the fuel temperature rises and kerosene undergoes the state transition from liquid to supercritical state. Deterioration of convective heat transfer is found to occur when the wall heat flux exceeds a critical value and at the same time, the wall temperature approaches the pseudo-critical temperature of kerosene. The present results show that deterioration of heat transfer are attributed to the development of turbulent properties in the near-wall region based on the results of turbulent kinetic energy and turbulence production term. The relation between the critical heat flux (q wc ) for occurrence of heat transfer deterioration and the mass flux (G) is studied and a fitting formula of q wc and G is obtained.

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Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Dang

Zhong

Zhang

et al. 2015

International Journal of Heat and Mass Transfer

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“…The property-evaluation methods were implemented into a commercial CFD package, FLUENT, through its user coding capability [24]. The numerical model and computational program, using the pressure-based solver in FLUENT, have been validated in our previous numerical studies [10,13,17].…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…The early studies on supercritical-pressure fluid flows and heat transfer focused mainly on water, carbon dioxide, hydrogen, and heavy hydrocarbon fuels [1][2][3][4][5][6][7][8][9][10][11][12][13], because of their practical/potential applications in nuclear reactors, refrigeration, aerospace propulsion and industrial power-generation systems. In recent years, because of the renewed interest in using cryogenic methane as an alternative propellant in aerospace propulsion systems [14,15], many studies on the supercritical-pressure fluid flows and heat transfer of cryogenic methane have been carried out, intended for fundamental understanding and practical applications of the regenerative engine cooling technology [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of supercritical-pressure fluid flows and heat transfer of methane in ribbed cooling tubes

Tang

Meng

2015

International Journal of Heat and Mass Transfer

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“…For this purpose, Shiralkar et al [22] stated that the HTD will do damage to the system safety operation, when the following conditions are satisfied: value proposed by Shiralkar et al [22]. As the heat flux further increases, significant thermal cracking will occur in the large specific heat capacity region because the wall temperature generally exceeds 870 K. The thermal cracking is an endothermic reaction, can absorb heat through the chemical heat sink, and as a result enhance the heat transfer [23]. Therefore, it can be concluded that the HTD will not cause serious harm to the cooling system under these operational conditions.…”

Section: Effects Of Heat Flux and Pressure On The Heat Transfermentioning

confidence: 99%

Numerical Study on Heat Transfer Deterioration of Supercritical n-Decane in Horizontal Circular Tubes

Wang

Dong

2014

Energies

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Abstract:In order to obtain a deeper understanding of the regenerative cooling process of scramjet engines, in this paper, a numerical investigation on the supercritical convective heat transfer of n-decane in horizontal circular tubes was conducted, based on a complete set of conservation equations and the Renormalization group (RNG) k-ε turbulence model with enhanced wall treatment. The present study mainly focuses on the heat transfer deterioration (HTD) phenomenon, including the mechanism and critical conditions for the onset of HTD. Moreover, the applicability of some conventional heat transfer empirical correlations was analyzed and compared, thus providing guidance for the Nusselt number predictions in the cooling channels. Results indicate that under the compositive conditions of low pressure and high heat flux, two types of HTD phenomena could occur when the wall and bulk fluid temperatures are near the pseudo-critical temperature, owing to the abnormal distributions of near-wall turbulent kinetic energy and radial velocity, respectively. Increasing the pressure would effectively alleviate and eliminate the HTD. A comparison of numerical results with those obtained with different empirical expressions shows that the Bae-Kim expression provides the best agreement, especially when HTD occurs. Furthermore, a new correction for critical heat flux of HTD has been successfully developed.

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Simplification of pyrolytic reaction mechanism and turbulent heat transfer of n-decane at supercritical pressures

Cited by 70 publications

References 30 publications

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Numerical study of heat transfer deterioration of turbulent supercritical kerosene flow in heated circular tube

Numerical study of supercritical-pressure fluid flows and heat transfer of methane in ribbed cooling tubes

Numerical Study on Heat Transfer Deterioration of Supercritical n-Decane in Horizontal Circular Tubes

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