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Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation

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Abstract

Impinging jets are one of the most industrially essential methods of cooling, for example, the cooling of gas turbine blades and electronic devices, drying or annealing of glasses. Usually, jets are configured for a specific purpose, but the flow tends to be very complicated as each jet interacts with the others, especially near the impingement surface. In the present study, complicated three-dimensional flow from a square array of circular impinging jets was revealed experimentally to investigate the effect on heat transfer characteristics. The flow fiel d was measured by scanning stereoscopic particle image velocimetry to confirm the detailed spatial features of the multiple circular impinging jets as nozzle-to-surface distance and jet-to-jet spacing were changed. Adjacent jets generated vortex rings and roll-up toward the nozzle plate, vortex rings and roll-up sizes changing depending on the experimental parameters. Differences in vorticity and dispersions of velocity from the jets were also observed. The temperature field of the impingement surface was measured using a thermosensitive liquid crystal technique. The spatial distribution of heat transfer coefficient was related to the flow field near the impingement surface.

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Abbreviations

D :

Jet hole diameter (m)

h :

Local heat transfer coefficient [W/(m2 K)]

L :

Injection distance from nozzle to target surface (m)

N :

Number of jet holes, N = 3 × 3 = 9, all number of particle image

Nu :

Local Nusselt number

q w :

Heat flux supplied to heat transfer surface (W/m2)

r :

Radial direction distance from central jet (m)

Re :

Reynolds number based on jet hole diameter

S :

Jet-to-jet spacing (m)

T J :

Jet temperature (K)

T w :

Wall temperature (K)

\(\bar{U}\) :

Mean flow velocity (m/s)

U k :

Instantaneous velocity of image number k (m/s)

U jet :

Jet velocity (m/s)

u, v, w :

Instantaneous velocity component (m/s)

\(\bar{u},\,\bar{v},\,\bar{w}\) :

Time-averaged velocity component (m/s)

x :

Streamwise distance, normal to target surface (m)

y :

Horizontal spanwise distance, along target surface (m)

z :

Vertical spanwise distance, along target surface (m)

\(\lambda\) :

Thermal conductivity of air [W/(m K)]

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tokyo University of Science, 6-3-1, Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan

    Yoshiyasu Ichikawa, Masahiro Motosuke, Yuki Kameya, Makoto Yamamoto & Shinji Honami

  2. Research Institute for Science and Technology, Tokyo University of Science, Tokyo, Japan

    Masahiro Motosuke & Yuki Kameya

Authors
  1. Yoshiyasu Ichikawa
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  2. Masahiro Motosuke
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  3. Yuki Kameya
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  4. Makoto Yamamoto
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  5. Shinji Honami
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Correspondence to Masahiro Motosuke.

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Ichikawa, Y., Motosuke, M., Kameya, Y. et al. Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation. J Vis 19, 89–101 (2016). https://doi.org/10.1007/s12650-015-0296-8

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  • DOI: https://doi.org/10.1007/s12650-015-0296-8

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