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    Initiation and Flame Propagation in Combustion of Gases and Pyrophoric Metal Nanostructures

    Nikolai M. Rubtsov,Boris S. Seplyarskii|2020.10.02

    Preface………………………………………………………………………………………2

    Acknowledgments…………………………………………………………………………..9

    Contents……………………………………………………………………………………..9

     

    Introduction…………………………………………………………………………………11

    Chapter I.  Gas-dynamic factors in combustion processes …………………………………24

    Introduction to Chapter I……………………………………………………………………24

    §1. Penetration of the laminar flames of natural gas?oxygen mixtures through

    conical obstacles…………………………………………………………………………….34

    §2. The features of penetration of methane-oxygen flames through flat obstacles with several openings……………………………………………………………………………………..40

    §3. Interaction of laminar flames of natural gas-oxygen mixtures with planar obstacles with asymmetrical openings………………………………………………………………………48

    §4. Catalytic activity of platinum and palladium in gaseous reactions of hydrogen and methane oxidation at low pressures……………………………………………………………………55

    § 5. Thermoacoustic regimes of combustion of n-pentane-air mixtures in the region of negative temperature coefficient………………………………………………………………………..62

    §6. The features of combustion of hydrogen and methane in oxygen and air in the presence of difluorodichloromethane additives……………………………………………………………71

    References to Chapter I………………………………………………………………………..85

    Conclusions to Chapter I……………………………………………………………………….95

    Chapter II

    Ignition and combustion of the mixtures of hydrogen and hydrocarbons with air and oxygen over noble metals……………………………………………………………………………………97

    Introduction to Chapter II………………………………………………………………………97

    §1. Experimental study of methane combustion over metallic palladium upon flame penetration through obstacles………………………………………………………………………………101

     

    §2. The features of hydrogen ignition over Pt and Pd foils at low pressures………………….107

    §3. Study of combustion of hydrogen?air and hydrogen?methane?air mixtures over the palladium metal surface using a hyperspectral sensor and high-speed color filming……………………114.

    §4. Ignition of hydrogen-hydrocarbon (C1-C6) -air mixtures over Pd at pressures 1÷2 atm…124

    §5.  Ignition of hydrogen-oxygen and stoichiometric hydrogen-methane-oxygen mixtures over hot wires at low pressures………………………………………………………………………….131

    §6. A negative temperature coefficient phenomenon in the combustion of hydrogen-propane-air mixtures, initiated with palladium……………………………………………………………..139

     

    §7. Features of hydrogen ignition over noble metals (Rhodium, Ruthenium, Palladium, Platinum) at low pressures…………………………………………………………………………………145

    §8. Features of hydrogen and deuterium ignition over noble metals (Rhodium, Palladium) at low pressures. Inverse isotope effect……………………………………………………................155

    References to Chapter II………………………………………………………………………..162

     

    Conclusions to Chapter II……………………………………………………………………….171

    Chapter III.

    Ignition and passivation of nanopowders and compact samples

    made of nanopowders…………………………………………………………………………..173

    Introduction to Chapter III………………………………………………………………………173

    §1. Features of combustion and passivation of nickel nanoparticles……………………………185

    §2. Passivation of nickel nanoparticles at subzero temperatures………………………………..193

    §3. Macrokinetic analysis of passivation of pyrophoric powders……………………………….200

    §4. Effect of the initial temperature on the modes of passivation of pyrophoric powders: macrokinetic approach………………………………………………………………………207

     

    §5. The modes of combustion of copper nanopowders……………………………………..214

    §6. Synthesis, the modes of combustion and passivation of tungsten nanopowders………..222

    §7. Macrokinetic investigation of the interaction mechanism of pyrophoric iron nanopowder compacts with the air…………………………………………………………………………229

    References to the Chapter III…………………………………………………………………238

    Conclusions to Chapter III……………………………………………………………………245

    Conclusions……………………………………………………………………………………247

     

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