0
research-article

Flow Characteristics of 3D Curved Wall Jets on a Cylinder

[+] Author and Article Information
Mirae Kim

School of Mechanical Engineering, Pusan National University, Busan 609-735, South Korea
futurekim@pusan.ac.kr

Hyun Dong Kim

School of Mechanical Engineering, Pusan National University, Busan 609-735, South Korea
marine797@pusan.ac.kr

Eunseop Yeom

School of Mechanical Engineering, Pusan National University, Busan 609-735, South Korea
esyeom@pusan.ac.kr

Kyung Chun Kim

School of Mechanical Engineering, Pusan National University, Busan 609-735, South Korea
kckim@pusan.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4038089 History: Received June 24, 2017; Revised September 14, 2017

Abstract

Three-dimensional (3D) curved wall jets are a significant topic in various applications related to local heat and mass transfer. This study investigates the effects of the impinging angle and Reynolds number with a fixed distance from the nozzle to the surface of a cylinder. The particle image velocimetry (PIV) method was used to measure the mean streamwise velocity profiles, which were normalized by the maximum velocity along the centerline of the impinging jet onto the cylinder. After the impingement of the circular jet, a 3D curved wall jet develops on the cylinder surface due to the Coanda effect. At a given Reynolds number, the initial momentum of the wall jet increases, and flow separation occurs further downstream than in normal impingement as the impinging angle increases. At a given impinging angle, flow separation is delayed with increasing Reynolds number. A self-preserving wall jet profile was not attained in the 3D curved wall jet. The turbulence intensity and the Reynolds shear stress were obtained to analyze the turbulence characteristics. The radial turbulence intensity showed similar tendencies to a two-dimenisional (2D) curved wall jet, but the streamwise turbulence intensity was dissimilar. The Reynolds shear stress decreases downstream of the cylinder wall due to the decreased velocity and centrifugal force.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In