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Pressure loss and heat transfer characterization of a camshaped cylinder at different orientations

Nouri Borujerdi, A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. Pressure drag coefficient and heat transfer are experimentally investigated around a single noncircular cylinder in cross-flow under angle of attack O deg < α < 360 deg and Reynolds number 1.5 × 104 < Reeq < 4.8 × 104 based on equivalent diameter of a circular cylinder. The results show that the trend of pressure drag coefficient against the angle of attack has a wavy shape but the wavy trend of the Nusselt number is smoother relative to the drag coefficient behavior. It is found that for l/Deq = 0.4 and over the whole range of the Reynolds number, the pressure drag coefficient has a minimum value of about CD = 0.4 at α = 30 deg, 180 deg, and 330 deg and a maximum value of about CD = 0.9 at a = 90 deg and 270 deg. The corresponding value of the mean Nusselt number to that of the equivalent circular tube is 1.05 < Nūcum/Nūcir < 1.08 at α = 90 deg and 270 deg as well as 0.87 < Nūcam/Nūcir < 0.92 at α = 30 deg and 180 deg. Copyright © 2008 by ASME
  5. Keywords:
  6. 270-deg ; Circular tubes ; Cross flows ; Equivalent diameter ; Maximum values ; Minimum value ; Non-circular ; Pressure drag ; Pressure loss ; Surface heat transfer ; Angle of attack ; Cams ; Circular cylinders ; Drag coefficient ; Heat exchangers ; Nusselt number ; Reynolds number
  7. Source: Journal of Heat Transfer ; Volume 130, Issue 12 , September , 2008 , Pages 1245031-1245034 ; 00221481 (ISSN)
  8. URL: https://asmedigitalcollection.asme.org/heattransfer/article-abstract/130/12/124503/467640/Pressure-Loss-and-Heat-Transfer-Characterization?redirectedFrom=fulltext