Effects of properties of atmosphere diluents on cool-flame combustion of normal-alkane droplets

2021 ◽  
Vol 229 ◽  
pp. 111408
Author(s):  
Vedha Nayagam ◽  
Daniel L. Dietrich ◽  
Forman A. Williams
Keyword(s):  
Normal Alkane ◽  
Cool Flame ◽  
Flame Combustion

Self-oscillations in the cool-flame combustion of a model n-heptane-isooctane mixture

1980 ◽  
Vol 14 (3) ◽  
pp. 335-339 ◽  
Author(s):  
Ya. Yu. Stepanskii ◽  
N. P. Evmenenko ◽  
G. S. Yablonskii ◽  
V. I. Bykov
Keyword(s):  
Cool Flame ◽  
Flame Combustion

The effect of hydrogen bromide on the products of the cool-flame combustion of n -pentane

1974 ◽  
Vol 341 (1625) ◽  
pp. 195-212 ◽  
Keyword(s):  
Initial Temperature ◽  
Hydrogen Bromide ◽  
Transient Temperature ◽  
Cool Flame ◽  
Flame Combustion ◽  
Cool Flames ◽  
Main Effect ◽  
Halogen Compound ◽  
Almost All ◽  
Uncatalysed Reaction

Detailed studies have been made of the products of the cool-flame combustion of n -pentane in the absence and presence of small concentrations (2-6 vol. %) of added hydrogen bromide. In the uncatalysed reaction, acetone and acetaldehyde are the principal products formed at low temperatures during the induction period preceding the first cool flame but increasing amounts of C 5 alkenes and O-heterocycles start to be formed as the initial temperature is increased. The main effect of hydrogen bromide is to increase dramatically the yields of C 5 ketones at the expense of almost all the other products. The results indicate that in the absence of the halogen compound the principal fate of the initially formed pentylperoxy radicals is isomerisation to hydroperoxypentyl radicals. At 250 °C, the latter radicals mainly add on further oxygen and are eventually converted to pentanedihydroperoxides; at higher temperatures, the hydroperoxypentyl radicals tend increasingly to decompose directly to give principally pentenes and C 5 O-heterocycles. Hydrogen bromide alters the mechanism operating with binary mixtures primarily by providing a source of readily abstractable hydrogen and thus enhancing the formation of pentenemonohydroperoxides. Control experiments on the homogeneous breakdown of pentane-2-monohydroperoxide show that the principal decomposition product is pentan-2-one and thus confirm the probable importance of pentanemonohydroperoxides as intermediates in the HBr-promoted reaction. Studies of the chemical changes accompanying the passage of cool flames show that these vary considerably with the prevailing conditions as well as with the number of previous cool flames which have propagated through the mixture. Hydrogen bromide causes well-defined differences in the nature and distribution of the products of the combustion of n -pentane, although these changes are not as great as those brought about by the passage of cool flames which generally lead to considerable transient temperature rises in the system.

The cool flame combustion of hydrocarbons I—Cyclohexane

1965 ◽  
Vol 9 (3) ◽  
pp. 317-327 ◽  
Author(s):  
B.H. Bonner ◽  
C.F.H. Tipper
Keyword(s):  
Cool Flame ◽  
Flame Combustion

The cool flame combustion of hydrocarbons II—Propane and n-heptane

1965 ◽  
Vol 9 (4) ◽  
pp. 387-392 ◽  
Author(s):  
B.H. Bonner ◽  
C.F.H. Tipper
Keyword(s):  
Cool Flame ◽  
Flame Combustion

scholarly journals Oscillatory cool flame combustion behavior of submillimeter sized n-alkane droplet under near limit conditions

2019 ◽  
Vol 37 (3) ◽  
pp. 3383-3391 ◽  
Author(s):  
Fahd E. Alam ◽  
Ali Charchi Aghdam ◽  
Frederick L. Dryer ◽  
Tanvir I. Farouk
Keyword(s):  
Cool Flame ◽  
Flame Combustion ◽  
Combustion Behavior

Ozone assisted cool flame combustion of sub-millimeter sized n-alkane droplets at atmospheric and higher pressure

2018 ◽  
Vol 195 ◽  
pp. 220-231 ◽  
Author(s):  
Fahd E. Alam ◽  
Sang Hee Won ◽  
Frederick L. Dryer ◽  
Tanvir I. Farouk
Keyword(s):  
Cool Flame ◽  
Flame Combustion

Cool-flame combustion of hydrocarbons

1965 ◽  
Vol 10 (1) ◽  
pp. 145-150 ◽  
Author(s):  
B.H. Bonner ◽  
C.F.H. Tipper
Keyword(s):  
Cool Flame ◽  
Flame Combustion

The cool-flame combustion of decane

1982 ◽  
Vol 382 (1783) ◽  
pp. 429-440 ◽  
Keyword(s):  
Carbonyl Compounds ◽  
Hydrogen Bromide ◽  
Combustion Products ◽  
Cool Flame ◽  
Flame Combustion ◽  
Hydroperoxide Formation ◽  
Slow Combustion ◽  
Flame Region ◽  
Increasing Temperature ◽  
Oxidative Attack

Three approaches have been used to elucidate the mechanism of combustion of decane in the cool-flame region. First, measurements have been made of cool-flame and ignition parameters. These show a well defined change in activation energy at about 530 K. Second, analytical studies have been made of the effect of increasing temperature on the combustion products. These indicate that hydroperoxide formation ceases and that C 10 O-heterocycles become the predominant products at 500-530 K; the relative amounts of decanal and decanone do not however change. Finally, small amounts of hydrogen bromide have been added. These cause the complete conversion of hydroperoxides into decanones even at low temperatures; no lower carbonyl compounds are formed above 500 K. This work has led to two principal conclusions. One, which is shown by all three methods of study, is that the cool-flame combustion of decane involves two distinct mechanisms with a transition at 500-530 K. The other is that the selectivity of initial oxidative attack on decane remains low over the whole of the slow combustion and cool-flame regions between 440 and 680 K, suggesting that hydroxyl radicals are the main attacking species throughout.

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