Influence of heating intensity and size of gel fuel droplets on ignition characteristics

Glushkov, Dmitrii O.; Pleshko, A.O.; Yashutina, Olga S.; Heat,

doi:10.1016/j.ijheatmasstransfer.2020.119895

Cited by 14 publications

(5 citation statements)

References 50 publications

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“…In addition, the greater the mass concentration of the injected fuel vapors, the more intense their interaction with the oxidizer, hence the ignition process is accelerated. The difference between the heat flux densities obtained under the convective-radiant heating conditions and the values for gel fuel combustion presented in [35] is due to the initial temperatures of the fuel samples. In [35], at the initial temperature of the gel fuel at 293 K, the heat flux density varied in the range of 40-100 kW/m 2 while the heat transfer coefficient varied in the range from 33 to 77 W/m 2 •K and the heating temperature was in a similar range of 973-1273 K. The calculated heat flux stays within the range of 30-300 kW/m 2 obtained in [36] by the ignition of a composite fuel based on ammonium perchlorate and butyl rubber during conductive heating with a metal particle.…”

Section: Resultsmentioning

confidence: 83%

“…The difference between the heat flux densities obtained under the convective-radiant heating conditions and the values for gel fuel combustion presented in [35] is due to the initial temperatures of the fuel samples. In [35], at the initial temperature of the gel fuel at 293 K, the heat flux density varied in the range of 40-100 kW/m 2 while the heat transfer coefficient varied in the range from 33 to 77 W/m 2 •K and the heating temperature was in a similar range of 973-1273 K. The calculated heat flux stays within the range of 30-300 kW/m 2 obtained in [36] by the ignition of a composite fuel based on ammonium perchlorate and butyl rubber during conductive heating with a metal particle. The difference in the minimum threshold of the heat flux found in [36] can be explained by significant differences in the conditions of fuel heating by different sources and significant differences in the thermophysical and kinetic characteristics of the condensed substances in [36] and the gel fuels.…”

Section: Resultsmentioning

confidence: 83%

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Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

Gaidukova

Стрижак

2021

Energies

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A model was developed to research the critical conditions and time characteristics of the ignition of gel fuels in the course of conductive, convective, radiant and mixed heat transfer. MATLAB was used for numerical modeling. Original MATLAB code was established pursuant to the developed mathematical model. For gel fuel ignition at initial temperatures corresponding to cryogenic storage conditions with different heating schemes, a numerical analysis of interconnected processes of heat and mass transfer in the chemical reaction conditions and exothermic and endothermic phase transitions was conducted. The model was tested by comparing the theoretical results with the experimental data. Dependencies were established between the key process characteristic (i.e., the ignition delay time) and the ambient temperature when the following parameters were varied: emissivity, heat emission coefficient, activation energy and pre-exponential factor of the fuel vapor oxidation reaction. The critical values of the main parameters of the energy source were determined. For these values, gel fuel ignition conditions were consistently realized for each heating scheme. The critical heat fluxes necessary and sufficient for the ignition of typical gel fuels were determined.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 83%

Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

Gaidukova

Стрижак

2021

Energies

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“…In recent years, gels have been increasingly applied in the food industry (Cao & Mezzenga 2020), medical technology (Narayanaswamy & Torchilin 2019;Daly et al 2020) and fuels and propellants (Glushkov, Pleshko & Yashutina 2020;Padwal, Natan & Mishra 2021;Glushkov et al 2022). The commonly used gels are mostly polymers, whose long-chain molecular structures form strong entangled or cross-linked networks through hydrogen bonds when dispersed in water.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, gels have been increasingly applied in the food industry (Cao & Mezzenga 2020), medical technology (Narayanaswamy & Torchilin 2019; Daly et al. 2020) and fuels and propellants (Glushkov, Pleshko & Yashutina 2020; Padwal, Natan & Mishra 2021; Glushkov et al. 2022).…”

Section: Introductionmentioning

confidence: 99%

Hemline breakup of gel drops subjected to a continuous air flow

et al. 2023

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To explore the effect of yield stress on the secondary breakup of gel drops, experimental and theoretical investigations are carried out by employing a high-speed camera. A unique hemline-type breakup, as a modified behaviour of sheet-thinning breakup, occurs when the air velocity increases to a high region. The edges of the drops constantly deform into thin membranes when the high-velocity air skims over the gel drops. These membranes vibrate vertically, and breaking points occur at high amplitudes, causing the formation of reticular fragments. The results of linear stability analysis indicated that the yield stress of the gel drops has an influence on the formation and breakup of the gel membranes. The breakup regime map and breakup times are also studied.

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“…These properties vary with the type and content of the gellant and the formulation methods [ 8 ]. Understanding and quantification of the constitutive relationship (between the shear stress and shear strain) of the gel fuel is one of the key points to design a gel propulsion system, as it is closely coupled with organizations of flow, atomization, and combustion processes [ 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Organic Kerosene Gel Fuel

Yan

Cao

et al. 2022

Gels

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Gel fuel potentially combines the advantages of solid fuel and liquid fuel due to its special rheological properties, which have essential impacts on the application of gel fuel in propulsion systems. In this paper, we study the rheological property of organic kerosene gel through a series of measurements on its viscosity as a function of the shear rate, temperature, and shear history. The measured datasets are then fitted with constitutive relationships between the viscosity and shear rate at three different levels: the power law shear-thinning model, the power law dependency on both the temperature and shear rate, and the thixotropic property. It is found that intense pre-shear could exhaust thixotropy and reduce viscosity of the kerosene gel. For the power law shear-thinning model, the consistency index increases with the gellant mass fraction, whereas the power law exponent remains constant. The dependence of viscosity on temperature could be well approximated by an empirical power law relationship. As for the thixotropic property of the kerosene gel, the fitted second-order kinetic model corresponds accurately to the viscosity at different shear rates and shear times. The constitutive models fitted in this work at different levels are consistent with each other and provide useful tools for further applications of organic kerosene gel fuel.

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Influence of heating intensity and size of gel fuel droplets on ignition characteristics

Cited by 14 publications

References 50 publications

Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

Hemline breakup of gel drops subjected to a continuous air flow

Rheological Properties of Organic Kerosene Gel Fuel

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