Simulation of the Effect of Metal-Surface Catalysis on the Thermal Oxidation of Jet Fuel

Doungthip, T.; Ervin, Jamie S.; Zabarnick, Steven; Williams, T. F.

doi:10.1021/ef030098d

Cited by 30 publications

(27 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, technology improvements on both fuel and combustion lead to a diversification of additive packages whose chemistry and their interactions with conventional fuel fractions are poorly assessed. The complex autoxidation chemistry coupled to the strongly varying pressure and temperature conditions − involved in automotive and aircraft injection systems result in an increase of fuel stress. Those stresses may in turn induce jet and diesel fuels autoxidation through spontaneous free radical oxidation at low temperature, which influences physical and chemical properties and leads to the formation of several oxidation products that finally give deposits on the fuel system.…”

Section: Introductionmentioning

confidence: 99%

Structure–Reactivity Relationships in Fuel Stability: Experimental and Kinetic Modeling Study of Isoparaffin Autoxidation

et al. 2018

View full text Add to dashboard Cite

Liquid phase stability is a major concern in the transportation and the energy field where fuels, lubricants and additives have to be stable from their production site to their application (engine, combustors). Although alkanes are major constituents of commercial fuels and well-documented solvents, their respective reactivities and selectivities in autoxidation are poorly understood. This experimental and modeling study aims at (i) enhancing the current knowledge on alkane autoxidation and (ii) reviewing and correcting the previously established structure reactivity relationships in alkane autoxidation. Experimentally, this study investigates the influence of branching [0-3] and temperature [373-433 K] on the autoxidation of alkanes using four octane isomers: n-octane (C8), 2-methylheptane (MH), 2,5-dimethylhexane (DMH) and the 2,2,4-trimethylpentane(TMP). Induction Period (IP) and qualitative species identification are used to characterize the autoxidation processes of alkanes. The present study also presents new detailed liquid-phase chemical mechanisms obtained with an automated reaction mechanism generator. Experimental results highlight a non-linear effect of the paraffins branching on IP according to compound structure and similar oxidation products for both normal and branched paraffins. The four iso-octanes mechanisms reproduce fairly well the temperature and the branching effects on IP within a factor of 4 for high temperature range (T>403 K). From rate-of-reaction and sensibility analyses, similarities in alkane autoxidation have been evidenced with notably the key role of peroxy radicals in both normal and branched alkane autoxidation. The origin of the structure-reactivity relations was confirmed from a kinetic point of view with the main role of the hydrogen type on the molecule. Finally, based on experimental results available in literature, an empirical relation involving simple descriptors (number of carbons, type of carbons, temperature) is proposed to estimate alkane stability.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure–Reactivity Relationships in Fuel Stability: Experimental and Kinetic Modeling Study of Isoparaffin Autoxidation

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In addition, the quartz crystal microbalance was considered as a valuable equipment to measure the jet fuel thermal stability, which could classify the fuels category based on the thermal stability and oxidation characteristics 18 . With the development of the computational fluid dynamics, 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 5 pseudo-detailed chemistry kinetic modeling was used to model dissolved O 2 consumption and antioxidant chemistry 19,20 …”

Section: Introductionmentioning

confidence: 99%

Thermal and Element Analyses for Supercritical RP-3 Surface Coke Deposition under Stable and Vibration Conditions

Tao

et al. 2015

Energy Fuels

View full text Add to dashboard Cite

Surface coke deposition mechanism on the supercritical aviation kerosene RP-3 was studied under stable and vibration conditions. The flowing RP-3 kerosene is pressurized to 5MPa, and heated from 400K to 723K in a stainless tube (I.D. =1.8mm, O.D. =2.2 mm, Length=1800mm) with a constant heat flux. The experimental mass flow rate is fixed at 3g/s (1180kg/ (m 2 s)) and the working fuel flows downward through the test tube. One-hour stable, one-hour with 600Hz vibration and long-duration with 566Hz vibration tube jam experiments were performed. The two vibration frequencies are close to the main frequencies of the combustion chamber vibration when it works. Flow resistance, heat transfer characteristics, coking amount and component analysis were compared between stable and vibration conditions. The results indicate that vibration can affect the coking distribution much more uniformly and extend the tube working time. Also, vibration inhibits the exponential growth of flow resistance by changing coke formation compared with the stable condition. Three obvious regions for heat transfer are considered during the long-duration vibration experiments. For coking elements analysis, trace elements of Cu have more apparent catalytic effects under vibration conditions. The elements Fe and Cr have higher content in the downstream section of the tube due to crushing caused by vibration. Nomenclature D diameter (m) f vibration frequency (Hz) h heat transfer coefficient (W m -2 K) L tube length (m) m mass flow rate (g/s) P pressure (kPa) q heat flux (kW/m 2 ) R(t) electronic resistivity (Ω m) T temperature (K) t time (min) x location position (m) Subscripts i inside o outside Pc pseudo critical s stable condition v vibration w wall

show abstract

“…When the amount of the carbon deposition accumulated is too small to affect the flow and heat transfer, it can be obtained by directly multiplying the carbon deposition rate times the reaction time. [33][34][35] In Liu et al's model, the concentrations of propylene and aromatics hydrocarbon in the near-wall fluid directly affect carbon deposition rate. Meanwhile, the formation of carbon deposition in turn consumes propylene and aromatics hydrocarbon.…”

Section: The Decoupling Algorithm Of the Carbon Deposition Modelmentioning

confidence: 99%

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

et al. 2021

View full text Add to dashboard Cite

In this paper, the effects of the geometric parameters of a rectangular cooling channel on the amount of pyrolysis carbon deposition in the channel unit of real fuel-cooled plates under the constraints of fixed overall plate shape and total flow rate are studied. A decoupling algorithm for simulating the carbon deposition on surfaces of three-dimensional (3D) channels is firstly established, and a carbon deposition rate model is extended for 3D channels.Using the developed method, the processes of pyrolysis carbon deposition in five fuel-cooled plates with various channel parameters are simulated. The effects of structural parameters on heat transfer, pyrolysis reaction, distribution of carbon deposition, and total carbon deposition amount are discussed.The results show that the channel geometric parameters indirectly affect pyrolysis carbon deposition in two ways: by changing the wall temperature where the carbon deposition reaction occurs through affecting the heat transfer and by changing the concentration of precursors through changing the residence time of fuel. A parameter θ related to the rectangular channel structure and the number of channels is defined. Under the geometric constraints of the channel unit, the smaller design parameter θ is beneficial to reduce carbon deposition in the channel.

show abstract

Simulation of the Effect of Metal-Surface Catalysis on the Thermal Oxidation of Jet Fuel

Cited by 30 publications

References 14 publications

Structure–Reactivity Relationships in Fuel Stability: Experimental and Kinetic Modeling Study of Isoparaffin Autoxidation

Structure–Reactivity Relationships in Fuel Stability: Experimental and Kinetic Modeling Study of Isoparaffin Autoxidation

Thermal and Element Analyses for Supercritical RP-3 Surface Coke Deposition under Stable and Vibration Conditions

Effects of geometric parameters of rectangular cooling channel on pyrolysis carbon deposition in fuel‐cooled plates

Contact Info

Product

Resources

About