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Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface.

Author(s) : SAN J. Y., SHIAO W. Z.

Type of article: Article

Summary

This work deals with the effects of jet plate size and plate spacing (jet height) on the heat transfer characteristics for a confined circular air jet vertically impinging on a flat plate. The jet after impingement was restricted to flow in two opposite directions. A constant surface heat flux of 1000 W/m2 was arranged. Totally 88 experiments were performed. Jet orifices individually with diameter of 1.5, 3, 6 and 9 mm were adopted. Jet Reynolds number (Re) was in the range 10,000-30,000 and plate spacing-to-jet diameter ratio (H/d) was in the range 1-6. Eleven jet plate width-to-jet diameter ratios and seven jet plate length-to-jet diameter ratios were Nusselt number is proportional to the 0.638 power of the Re and inversely proportional to the 0.3 power of the H/d. Through comparisons among the present obtained data and documented results, it may infer that, for a jet impingement, the impingement-plate heating condition and flow arrangement of the jet after impingement are two important factors affecting the dependence of the stagnation Nusselt number on H/d. [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface.
  • Record ID : 2007-0103
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 19-20
  • Publication date: 2006/09

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