Research Papers: Fundamental Issues and Canonical Flows

Flow Characteristics of Three-Dimensional Curved Wall Jets on a Cylinder

[+] Author and Article Information
Mirae Kim

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

Hyun Dong Kim

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

Eunseop Yeom

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

Kyung Chun Kim

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

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 24, 2017; final manuscript received September 14, 2017; published online November 16, 2017. Assoc. Editor: Devesh Ranjan.

J. Fluids Eng 140(4), 041201 (Nov 16, 2017) (7 pages) Paper No: FE-17-1377; doi: 10.1115/1.4038089 History: Received June 24, 2017; Revised September 14, 2017

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-dimensional (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.

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Fig. 8

Turbulence intensity profile: streamwise component: (a) α = 0 deg and (b) α = 45 deg at Re# = 11,800; radial component: (c) α = 0 deg and (d) α = 45 deg at Re# = 11,800

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Fig. 7

Development of jet half width according to the impinging angle and Reynolds number, which is normalized by the jet nozzle diameter

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Fig. 9

Contour of Reynolds shear stress normalized by jet exit velocity. Streamlines are inserted for better clarity. (a) α = 0 deg, Re# = 3300 (b) α = 0 deg, Re# = 11,800, and (c) α = 45 deg, Re# = 11,800.

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Fig. 6

Mean velocity profiles for θ = 15 deg, 60 deg, and 120 deg with respect to impinging angle and Reynolds number

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Fig. 5

Mean velocity profile with various cylindrical angles compared with slot jet (Chan et al. [15])

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Fig. 4

Mean velocity field at combined view #2 and view #3 for (a) α = 0 deg and (b) α = 45 deg; Re# = 3300, 7100, and 11,800 from the left side

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Fig. 3

Mean velocity field at view #1 for (a) α = 0 deg, Re# = 11,800 and (b) α = 45 deg, Re# = 11,800

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Fig. 2

Flow configuration and coordinate system of mean velocity profile

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Fig. 1

An illustration of the experimental setup and field of view



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