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An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions

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Abstract

The effects of Reynolds number, coflow stream and surface roughness on a steady two-dimensional wall jet were examined experimentally in an atmospheric boundary layer wind tunnel using a Cobra probe. Five Reynolds numbers in the range 56,500 < Re < 134,000 and five values of coflow velocity/jet velocity ratio ranging from 0.11 to 0.23 were considered. In addition, a 40-grit sheet was used as the rough surface to investigate the effect of surface roughness. The results demonstrate that the Reynolds stress increases with the decrease of slot Reynolds number, and the effects of a higher Reynolds number on the spread of the half-height and the decay of maximum velocity are less pronounced. The coflow and surface roughness have a clear effects on the streamwise development of the half-height and the maximum mean velocity. The coflow significantly decreases the spread rate and the decay of maximum velocity compared with those without coflow, while the surface roughness increases those parameters relative to those on a smooth surface.

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Data Availability

The datasets generated during the current study are available from the corresponding author on reasonable request.

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Funding

The work described in this paper was supported by National Natural Science Foundation of China (Grant No.52008070 and 52178458); This research was supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202001511); This research was supported by the Foundation of Chongqing Science and Technology Commission(Grant No. cstc2020jcyj-msxmX0530) and the Research Foundation of Chongqing University of Science and Technology (Grant No. ckrc2019039).

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing, 401331, China

    YL. Zhong, ZT. Yan, XP. Liu & J. Luo

  2. Chongqing Key Laboratory of Energy Engineering Mechanics & Disaster Prevention and Mitigation, Chongqing, 401331, China

    YL. Zhong, ZT. Yan, XP. Liu & J. Luo

  3. School of Civil Engineering, Chongqing University, Chongqing, 400045, China

    ZT. Yan, XG. Yang & JY. Cao

  4. Department of Mechanical and Materials Engineering, University of Western Ontario, London, Canada

    E. Savory

Authors
  1. YL. Zhong
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  2. ZT. Yan
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  3. E. Savory
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  4. XP. Liu
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  5. J. Luo
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Contributions

Yongli Zhong: Writing-original draft, Methodology, Funding acquisition. Zhitao Yan: Conceptualization, Funding acquisition, Writing-review and editing. Eric Savory: Writing-review and editing. Xinpeng Liu and Jun Luo: aerodynamic testing, data analysis. Xiaogang Yang and Junyang Cao: aerodynamic testing.

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Correspondence to ZT. Yan.

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Zhong, Y., Yan, Z., Savory, E. et al. An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions. Exp Tech 48, 285–298 (2024). https://doi.org/10.1007/s40799-023-00659-9

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