Abstract
An investigation on the fully developed heat transfer and friction factor characteristics has been made in rectangular ducts with one-side roughened by five different shapes. The effects of rib shape geometries as well as Reynolds numbers are examined. The rib height-to-duct hydraulic diameter, pitch-to-height ratio, and aspect ratio of channel width to height are fixed ate/De=0.0476,P/e=8, andW/H=2.33, respectively. To understand the characteristics of heat transfer enhancements, the friction factors are also measured. The data indicates that the triangular type rib has a substantially higher heat transfer performance than any other ones.
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Abbreviations
- AR :
-
Aspect ratio of channel width to height
- De :
-
Hydraulic diameter (m)
- e :
-
Roughness height (m)
- e + :
-
Roughness Reynolds number, (e/De) Re(f/2) 0.5
- f :
-
Average friction factor for the channel volume
- f τ :
-
Friction factor based on the rough wall
- H :
-
Duct height (m)
- Nu :
-
Nusselt number
- ΔP:
-
Pressure difference (Pa)
- P :
-
Roughness pitch (m)
- Re :
-
Reynolds number, (U b De)/ν
- St :
-
Stanton number,Nu/(Re P r )
- T b :
-
Bulk temperature (K)
- T ω :
-
Wall temperature (K)
- U :
-
Local velocity (m/s)
- U * :
-
Friction velocity (m/s)
- U b :
-
Bulk velocity (m/s)
- W :
-
Duct width (m)
- ν:
-
Kinematic viscosity (m2/s)
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Ahn, S.W., Son, K.P. An investigation on friction factors and heat transfer coefficients in a rectangular duct with surface roughness. KSME International Journal 16, 549–556 (2002). https://doi.org/10.1007/BF03185084
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DOI: https://doi.org/10.1007/BF03185084