Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Effect of exit Reynolds number on self-preservation of a plane jet

Mi Jian-Chun Feng Bao-Ping Deo Ravinesh C Nathan Graham J

Citation:

Effect of exit Reynolds number on self-preservation of a plane jet

Mi Jian-Chun, Feng Bao-Ping, Deo Ravinesh C, Nathan Graham J
PDF
Get Citation

(PLEASE TRANSLATE TO ENGLISH

BY GOOGLE TRANSLATE IF NEEDED.)

  • We investigated in experiment the effect of exit Reynolds number on self-preservation of a turbulent plane jet. Centerline velocity statistics were measured in plane jets issuing from the same nozzle but, respectively, with seven Reynolds numbers varying between Re = 4,582 and Re = 57,735, where Re ≡ Uj h/ν(Uj being the momentum-averaged exit mean velocity, h the slot height and ν the kinematic viscosity). All measurements were conducted using single hot-wire anemometry and over an axial distance (x) of 40 h. These measurements revealed a significant Re-dependence of either the mean or turbulent flow field. As Re increases, the pace of the jet development decreases and, as a result, both the mean and turbulent properties reach their self-preserving states over a longer downstream distance (x). The centerline integral scale L for all jets grows linearly with x and the growth rate decreases as Re is increased. It is also found that the local Reynolds number ReL scales with x as ReL∝x1/2. The study suggests that differences of the self-preserving states observed may be related to the differences in the underlying turbulence structures in the near field of the seven jets.
Metrics
  • Abstract views:  7880
  • PDF Downloads:  2086
  • Cited By: 0
Publishing process
  • Received Date:  16 December 2008
  • Accepted Date:  06 March 2009
  • Published Online:  20 November 2009

/

返回文章
返回