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Heat transfer enhancement of an impinging synthetic air jet using diffusion-shaped orifice.

Author(s) : LIU Y. H., CHANG T. H., WANG C. C.

Type of article: Article

Summary

Impingement heat transfer from a synthetic air jet through a diffusion-shaped orifice was investigated in this study. The effect of the opening angle (60° and 90°), orifice thickness (1–3?mm), and driven frequencies (400–800?Hz) were examined. Hot-wire anemometry was used to measure the instantaneous and average flow velocities ejected from the jet holes. At a small jet-to-surface spacing, synthetic jets from a diffusion-shaped orifice produced higher heat transfer than that from a round orifice. The highest heat transfer enhancement from using a diffusion-shaped orifice was approximately 30% compared with the round orifice at an opening angle of 60°. The diffusion-shaped orifice achieved the highest area-averaged heat transfer coefficient and Nusslet number of 80?W/m2·K and 8.9, respectively. When the opening angle increased to 90°, heat transfer enhancement was degraded because of increased flow circulation and reduced ejection flow velocity. The effect of orifice configuration on the heat transfer diminished as the jet-to-surface spacing increased.

Details

  • Original title: Heat transfer enhancement of an impinging synthetic air jet using diffusion-shaped orifice.
  • Record ID : 30016913
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 94
  • Publication date: 2016/02/05
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.10.054

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