Dynamics of a Surface Bump Generated by an Air-Water Free Surface Jet Impingement

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Naoto Ohmura¹  Jianxing Zheng²  Tokuo Yoshimura¹  Kunio Kataoka¹ 

[1] Department of Chemical Science and Engineering, Kobe University;Division of Resource and Energy Science, Graduate School of Science and Technology, Kobe University,

关键词: Free Interface;    Free Surface;    Surface Bump;    Impinging Jet;   

DOI  :  10.1252/jcej.36.147

来源: Maruzen Company Ltd

【 摘 要 】

References(12)A submerged water jet impinging upon a free air-water surface has been investigated experimentally. The present work focuses on the dynamic deformation of the surface bump generated in the jet impingement region. The surface bump has a quake motion comprising two basic oscillations: fluttering motion (transversely) and swelling motion (vertically). The velocity measurement was made beneath the bump with hot-wire anemometry. The motion of the geometrical stagnation point was analyzed with the aid of an image processing. It has been ascertained that a helical instability of the approaching jet is the origin of the fluttering motion of the surface bump and that the swelling motion is controlled by the large-scale vortical/turbulent structure of the approaching jet convected with phase velocity.

【 授权许可】

Unknown