Experimental and Numerical Investigations on <i>n</i>-Decane Thermal Cracking at Supercritical Pressures in a Vertical Tube

Zhu, Yinhai; Liu, Bo; Jiang, Pei-Xue

doi:10.1021/ef401924s

Cited by 169 publications

(67 citation statements)

References 29 publications

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“…In heat transfer deterioration mode, the maximum deviation of 7.48% occurs in run 5 where the average deviation is less than 3.45%. The distinction between the calculated result and experimental data appears as the wall temperature is larger than 760 K which may be caused by the endothermic pyrolysis reaction [40]. Overall, it is implied that the numerical method used in current paper is reliable.…”

Section: Model Validationmentioning

confidence: 80%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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This article presented a numerical investigation of supercritical heat transfer of hydrocarbon fuel in a series of horizontal tubes with different diameters. It has been carried out by solving Reynolds averaging equations of mass, momentum and energy with the LS low-Reynolds number turbulence model using the pressure-based segregated solver based on the finite volume method. For the purpose of comparison, a four-species surrogate model and a ten-species surrogate model of aviation kerosene RP-3 (Rocket Propellant 3) were tested against the published experimental data. In the current study, tube diameter varied from 2 mm to 10 mm and pressure was 3 MPa with heat flux to mass flux ratios ranging from 0.25 to 0.71 kJ/kg. It has been found that the buoyancy has significant effect on wall temperature non-uniformity in the horizontal tube. With the increase of diameter, the buoyancy effect enhances and the thermal-induced acceleration effect reduces. The buoyancy effect makes wall temperature at the top and bottom generatrices of horizontal tube increase and decrease, respectively. Due to the coupled effect of buoyancy and thermal-induced acceleration caused by the significant change of the properties, as diameter increases, heat transfer deteriorates dramatically at the top generatrix but remains almost unchanged at the bottom generatrix at high heat flux to mass flux ratio. Heat transfer enhancement is observed at low heat flux to mass flux ratio when tube diameter is less than 6 mm. Moreover, the safety analysis has been performed in order to optimally design the supercritical cooling system.

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Section: Model Validationmentioning

confidence: 80%

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Cheng

Tao

Zhu

et al. 2018

Applied Thermal Engineering

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“…Thermal cracking of kerosene‐based endothermic hydrocarbon fuel is conducted in a flow tube reactor heated electrically, reported in depth in the literatures 25,26 . The experimental setup mainly consists of flow reactor, heating and cooling unit, separator unit, and measurement system.…”

Section: Resultsmentioning

confidence: 99%

Experimental study of ignition behaviors of pyrolysis gas of kerosene‐based endothermic hydrocarbon fuel

2021

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Summary The pyrolysis gas consisting of 29.4% CH4, 21.3% C2H4, 30.8% C2H6, and 18.5% C3H6 in mole fraction is presented, as the surrogate of the actual gaseous pyrolysis products. At the conditions of TC = 877.7‐963 K, PC = 3.22‐4.37 MPa, φ = 0.5 and 1.0, the ignition delays of pyrolysis gas/air (diluted with 52% Ar) have been measured. With TC or PC increasing, the ignition delay time decreases. The auto‐ignition of φ = 1.0 is faster than that of φ = 0.5. Furthermore, two widely used small hydrocarbons chemical mechanisms are validated with the measured results. The USC‐II mechanism can well predict experimental results at high‐T regimes, but fails at low‐T regimes. By sensitivity analysis of temperature, the two elementary reactions C2H6 + OH = C2H5 + H2O (negative sensitivity coefficient) and C3H6 + OH = aC3H5 + H2O (positive sensitivity coefficient) have been identified, which have higher reactivity at low‐T and lower reactivity at high‐T. Considering the extreme uncertainty of rate constants of C3H6 + OH = aC3H5 + H2O, the kinetic parameters have been modified for improving the predictions. The validated results indicate that the optimized mechanism improves predictions of the auto‐ignition behavior at low temperature regimes.

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“…For the continuous process from liquid to gas of hydrocarbon fuel under high pressure, the ideal gas model is invalid. In this work, the Peng‐Robinson (P‐R) EoS was used to describe the the relation of P , V , and T , because of its wide range of validity and ease of implementation

P = \frac{R T}{V_{} - b} - \frac{a}{V_{}^{2} + 2 b V_{} - b^{2}}

…”

Section: Freely Distributed Parallel Minichannelsmentioning

confidence: 99%

Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

et al. 2018

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In this article, the flow distribution of the Chinese No. 3 jet fuel in parallel minichannels heat exchanger under high temperature condition was investigated. The models of PFR and choked flow were established based on the real fluid model. The formation mechanism of flow maldistribution of the fuel in the freely distributed channels was studied. It was found that: under low heat flux, the slight flow rate deviation will be spontaneously eliminated; under high heat flux, the slight deviation of flow rate and heat flux will be enlarged and result in the channel with smaller flow rate entering the coking region. The feasibility and influence factors of the control method of flow distribution based on choked flow were discussed. The experimental results indicated that the minichannels fuel‐cooled plate with choked flow could maintain uniform flow distribution when the total fuel outlet temperature reached 1035 K. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2781–2791, 2018

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Experimental and Numerical Investigations on n-Decane Thermal Cracking at Supercritical Pressures in a Vertical Tube

Cited by 169 publications

References 29 publications

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Diameter effect on the heat transfer of supercritical hydrocarbon fuel in horizontal tubes under turbulent conditions

Experimental study of ignition behaviors of pyrolysis gas of kerosene‐based endothermic hydrocarbon fuel

Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

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