A comparison study on the combustion and sooting characteristics of base engine oil and n-dodecane in laminar diffusion flames

Wang, Hu; Li, Yixuan; Iqbal, Zohaib; Wang, Yang; Ma, Chunshan; Yao, Mingfa

doi:10.1016/j.applthermaleng.2019.113812

Cited by 9 publications

(5 citation statements)

References 30 publications

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“…We chose n-dodecane because it possesses hydrophobic and non-volatile properties and is chemically inert. 43 Often used as a model system to mimic engine oil, 44 reactivities of n-dodecane/liquid/metal interfaces can be of interest to corrosion applications in oil industries. 45 Zn is of considerable practical importance in the automotive industry, serving as a sacrificial cathode for steel substrates.…”

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confidence: 99%

Nanoscale Scanning Electrochemical Cell Microscopy and Correlative Surface Structural Analysis to Map Anodic and Cathodic Reactions on Polycrystalline Zn in Acid Media

Shkirskiy

Yule

Daviddi

et al. 2020

J. Electrochem. Soc.

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Scanning electrochemical cell microscopy (SECCM) is used to map anodic and cathodic processes on polycrystalline zinc in 10 mM H2SO4, at the nanoscale. Electrochemical maps are correlated directly with structural data from electron backscatter diffraction applied to the same regions of the surface, and density functional theory (DFT) calculations are used to rationalize the data. Preliminary data on droplet stability with SECCM point measurements indicated that there was a significant spreading of the meniscus cell with an air atmosphere, attributed to changes in pH during the oxygen reduction reaction, compromising the lateral resolution of the SECCM measurement. Experiments with an argon atmosphere, as well as the application of a hydrophobic n-dodecane oil layer on the Zn interface, prevented spreading. Electrochemical maps of polycrystalline Zn surface under an Ar atmosphere indicated that the hydrogen evolution reaction (HER) and Zn electrodissolution on individual low-index grains decreased in the order 1 ¯ 2 1 ¯ 0 ≥ 01 1 ¯ 0 > 0001 . DFT calculations revealed a correlation between experimental values of current associated with HER and Zn dissolution reactions and the predicted hydrogen adsorption and Zn dissolution energies on individual facets, respectively. This work further advances SECCM as a technique for probing electrified interfaces and demonstrates its applicability to reactive metals.

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mentioning

confidence: 99%

Nanoscale Scanning Electrochemical Cell Microscopy and Correlative Surface Structural Analysis to Map Anodic and Cathodic Reactions on Polycrystalline Zn in Acid Media

Shkirskiy

Yule

Daviddi

et al. 2020

J. Electrochem. Soc.

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show abstract

“…38 This solver was validated and widely applied to investigate the PAHs and soot formation. [39][40][41][42][43] The numerical calculations were performed on a non-equispaced, stretched, two-dimensional, rectangular domain, with a length of 155 mm and a width of 25 mm. Considering the balance between the accuracy of numerical calculation and the cost of computational time, a mesh with 8864 cells was found fine enough for the purpose of the present work.…”

Section: Methodsmentioning

confidence: 99%

The impact of heterogeneous environmental regulations on carbon neutrality in China: New evidence based on the spatial measurement model

Yang

Peng

Tang

2022

Energy & Environment

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Identifying the differentiated effects of different environmental regulations is the basis for promoting China's zero carbon emissions and carbon neutrality. We used Chinese provincial panel data from 2003 to 2017 to empirically test the impact of different environmental regulations on carbon neutrality through spatial measurement models. The highlights of the study are as follows: (1) Environmental regulations exert significant impact on carbon emissions, but different types of environmental regulations exert significantly different effect on carbon emissions. Public participation environmental regulation has a control effect on regional carbon emissions, while command-based and market-based environmental regulations had no significant effect on regional carbon neutrality. (2) The heterogeneity of the impact of different types of environmental regulations on carbon emissions can also be identified from the regional impacts heterogeneity and lags impact heterogeneity. (3) The combined mandatory and market-based environmental regulations and the combined mandatory and public-participatory environmental regulations significantly inhibited regional carbon neutrality.

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“…38 This solver was validated and widely applied to investigate the PAHs and soot formation. 39–43 The numerical calculations were performed on a non-equispaced, stretched, two-dimensional, rectangular domain, with a length of 155 mm and a width of 25 mm. Considering the balance between the accuracy of numerical calculation and the cost of computational time, a mesh with 8864 cells was found fine enough for the purpose of the present work.…”

Section: Methodsmentioning

confidence: 99%

The effects of oxygen index on soot formation of ethylene, propane and their mixtures in coflow diffusion flames

Zheng

Hui

Xue

et al. 2022

Energy & Environment

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Oxygen index (OI) effects on soot formation and oxidation of ethylene, propane and their mixtures were investigated in coflow diffusion flames. Experimental results show that the peak soot volume fraction (SVF) firstly increases and then reaches the plateau region as OI increases from 0.21 to 0.42 in ethylene and 90%ethylene/10%propane mixture flames. However, the peak SVF firstly increases and then decreases with the increase of OI in propane flame. All these three cases present a consistent trend in terms of maximum soot yield which increases first and then decreases as OI increases. Synergistic effect was captured in ethylene/propane mixtures while it was firstly enhanced and then mitigated when OI increases in the investigated OI range. Numerical simulations were also conducted. A significant relationship was found among flame temperature, O2 mole fraction and SVF in terms of their spatial gradients. The non-linear trends of SVF and soot yield with OI can be attributed to the competition between soot formation and oxidation. Such competition was also indicated from polycyclic aromatic hydrocarbons (PAHs) growth. Numerical analyses revealed that small radicals including O, CH2 and C6H5 contribute to the non-linear changes of PAHs in the synergistic effect.

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A comparison study on the combustion and sooting characteristics of base engine oil and n-dodecane in laminar diffusion flames

Cited by 9 publications

References 30 publications

Nanoscale Scanning Electrochemical Cell Microscopy and Correlative Surface Structural Analysis to Map Anodic and Cathodic Reactions on Polycrystalline Zn in Acid Media

Nanoscale Scanning Electrochemical Cell Microscopy and Correlative Surface Structural Analysis to Map Anodic and Cathodic Reactions on Polycrystalline Zn in Acid Media

The impact of heterogeneous environmental regulations on carbon neutrality in China: New evidence based on the spatial measurement model

The effects of oxygen index on soot formation of ethylene, propane and their mixtures in coflow diffusion flames

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