An Experimental Observation of Axial Variation of Average Size of Methane Clusters in a Gas Jet

• Published in: Chinese physics letters Vol. 27; no. 4; pp. 103 - 106
• Main Author: 韩纪锋 杨朝文 缪竟威 陆建峰 刘猛 罗小兵 师勉恭
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.04.2010
• Subjects: Argon; Backing; Clusters; Methane; Nozzles; Rayleigh scattering; 功率调整; 实验观察; 平均尺寸; 散射光强度; 燃气射流; 轴向位置
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/4/043601

Axial variation of average size of methane clusters in a gas jet produced by supersonic expansion of methane through a cylindrical nozzle of 0.8 mm in diameter is observed using a Rayleigh scattering method. The scattered light intensity exhibits a power scaling on the backing pressure ranging from 16 to 50bar, and the power is strongly Z dependent varying from 8.4 （Z = 3mm） to 5.4 （Z = 11mm）, which is much larger than that of the argon cluster. The scattered light intensity versus axial position shows that the position of 5mm has the maximum signal intensity. The estimation of the average cluster size on axial position Z indicates that the cluster growth process goes forward until the maximum average cluster size is reached at Z - 9 mm, and the average cluster size will decrease gradually for Z 〉 9 mm.