The entrainment of ambient air into a transient hydrogen jet and its flame jet were investigated. The air mass entrained into the transient jet could be determined by analyzing the path lines of micro balloons in a laser light sheet using a controlled CCD camera system. The main results are as follows: (1) The spatial and temporal changes of the entrainment could be obtained in both the cold and the flame jets. (2) The rural air mass entrained into the flame jet is nearly equal to that in the cold jet. (3) The entrainment rate per unit area of the flame jet is smaller than that of the cold jet. (4) A transient jet is separated into two regions, that is, the side and front parts of the jet. The rate of air mass entrained from the front part of the jet decreases with time while that entrained into the side of the jet per unit area remains almost the same. (5) The air mass entrained into the jet can be explained by the momentum theory.
|Number of pages||7|
|Journal||Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|Publication status||Published - 1997|
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering