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Effets de la taille des plaques à jets et de leur espacement sur le nombre de Nusselt pour un jet d'air circulaire confiné dirigé sur une surface plane.

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

Auteurs : SAN J. Y., SHIAO W. Z.

Type d'article : Article

Résumé

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].

Détails

  • Titre original : Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface.
  • Identifiant de la fiche : 2007-0103
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 49 - n. 19-20
  • Date d'édition : 09/2006

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