Investigation of flow structure and heat transfer characteristics in an array of impinging slot jets

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• 作者：Yucel Ozmen ; Gokhan Ipek
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：52
• 期：4
• 页码：773-787
• 全文大小：4,358 KB
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• 作者单位：Yucel Ozmen (1)
  Gokhan Ipek (1)
  
  1. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey
  
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181

文摘

In this study, an experimental and numerical study is carried out to investigate flow field and heat transfer characteristics of unconfined and confined arrays of four turbulent slot air jets issuing from the lower surface and impinging normally on the upper surface. Pressure and temperature distributions on the surfaces were obtained for the nozzle-to-plate spacing (H/W) of 1–10 and for the Reynolds numbers in the range of 5000–15,000 at the jet-to-jet centerline spacing (S/W) of 9. The effects of jet confinement, Reynolds number and nozzle-to-plate spacing on the flow structure and heat transfer were investigated. Pressure distributions are obtained experimentally and numerically, while heat transfer distributions are computed numerically. It is observed that the surface pressure distributions on both impingement and confinement plates are independent from the Reynolds number, while they have been largely affected from the nozzle-to-plate spacing. Jet confinement causes a considerable difference at the flow field especially for small nozzle-to-plate spacings. Subatmospheric regions are not observed for unconfined jet. However three different types of subatmospheric pressure regions occur on both impingement and confinement plates for confined jet. Nusselt distributions on the impingement plate for both unconfined and confined jet configurations depend on the Reynolds number and nozzle-to-plate spacing. It is concluded that there is a strong correlation between subatmospheric regions and secondary peaks in Nusselt distributions. The numerical results obtained using the Realizable k-ε turbulence model is in good accordance with the experimental results for moderate values of nozzle-to-plate spacings.