Various aspects of the method of impinging-streams, which proved to be one of the most efficient methods for performing the gas-solid operations in Chemical Engineering, are discussed. The aim of the review is to bring the method of impinging-streams and its possibilities to the attention of the Chemical Engineering community, to stimulate further research in the field and to encourage the technological applications of this method. KEYWORDS: Impinging streams, Impinging jets, Impingement zone, Opposed jets

Applications of impinging-streams in chemical engineering processes—review

This paper deals with the jet flames of rich propane-air mixtures in a counter air stream. At a constant jet nozzle pressure a stable combustion can be obtained within the appropriate ranges of the air-fuel ratio of the jets and the velocity of the counter air streams. In order to examine the fundamental characteristics of the flames, the behaviour of some typical flames within the stability curve is studied by means of visual observation and temperature and concentration measurements. A concept of similar flame based on the temperature profile at the maximum temperature section is introduced and confirmed experimentally. By using this concept a dimensionless flame stability curve can be obtained. The temperature, concentration and heat release rate profiles give a good explanation of the estimated relationship between the flame and flow pattern.

Koji Imamura

Papers

Jet Flames Stabilized by a Counter Air Stream

対向流によって安定化された噴流火炎の研究 : 第2報、主として濃度分布による考察