cool flame

cool flame

[¦kül ¦flām]
(chemistry)
A faint, luminous phenomenon observed when, for example, a mixture of ether vapor and oxygen is slowly heated; it proceeds by diffusion of reactive molecules which initiate chemical processes as they go.
References in periodicals archive ?
[14] experimentally studied the ignition and extinction of nonpremixed cool flame at elevated pressures in the counterflow and demonstrated the hysteretic nature of ignition and extinction of cool flames by flame images.
In recent investigations using DNS Borghesi and Mastorakos [2] showed that cool flame reactions initiated at the lean part of a single droplet resulted in an increase in the local temperature in richer regions, which led to the high temperature ignition.
In addition, an examination of the HRR waveforms reveals that faint heat release (region A), probably attributable to a cool flame, can be discerned when the SAI system was turned Off.
They've been "Keepers of the Flame'' since 1971 -- the cool flame of the uplifting and soulful music of traditional New Orleans jazz.
However, there are specific applications, where the low- and intermediate-temperature oxidative regions become important, for example, homogeneous charge compression ignition (HCCI) internal combustion engines (ICE) [4-6], lean premixed prevaporized (LPP) combustors in gas turbines [7, 8], and liquid fuel reformers for fuel cell applications [9-11] or industrial safety [12, 13]; in these cases, cool flame reactions largely determine the overall reactivity and have to be taken into account.
Seyla's seasoned solo dance to "The September of My Years," so revealing in its spareness, not only melts the audience but also Farmer's cool flame. Roberts and Plantadit are stunning in the "That's Life" adagio, making its push-comes-to-shove dynamic a dazzling duel of the sexes.
Basic venting principle is to cool flame gases within a special stainless steel mesh filter leading to a reduction of expanding gas volume as it extinguishes the flame.
Low-temperature oxidation reactions as typified by a cool flame and other phenomena have been cited as precursor reactions that take place before autoignition occurs.
Note that this is also true in the presence of a cool flame, even if the cool flame behavior is not retrieved.
In cool flames one must also consider reactions involving [HO.sub.2] such as:
The lean fuel mixtures, studied in a cylinder roughly 30 centimeters in diameter, generated unusually cool flames with about one-hundredth the power of a common match flame, says project scientist Karen J.