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Numerical Analysis of Water Forced Convection in Channels with Differently Shaped Transverse Ribs

Author

Listed:
  • Oronzio Manca
  • Sergio Nardini
  • Daniele Ricci

Abstract

Heat transfer enhancement technology has the aim of developing more efficient systems as demanded in many applications. An available passive method is represented by the employ of rough surfaces. Transversal turbulators enhance the heat transfer rate by reducing the thermal resistance near surfaces, because of the improved local turbulence; on the other hand, higher losses are expected. In this paper, a numerical investigation is carried out on turbulent water forced convection in a ribbed channel. Its external walls are heated by a constant heat flux. Several arrangements of ribs in terms of height, width, and shape are analyzed. The aim is to find the optimal configuration in terms of high heat transfer coefficients and low losses. The maximum average Nusselt numbers are evaluated for dimensionless pitches of 6, 8, and 10 according to the shape while the maximum friction factors are in the range of pitches from 8 to 10.

Suggested Citation

  • Oronzio Manca & Sergio Nardini & Daniele Ricci, 2011. "Numerical Analysis of Water Forced Convection in Channels with Differently Shaped Transverse Ribs," Journal of Applied Mathematics, John Wiley & Sons, vol. 2011(1).
    • Handle: RePEc:wly:jnljam:v:2011:y:2011:i:1:n:323485
    DOI: 10.1155/2011/323485
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    References listed on IDEAS

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    1. Karwa, Rajendra & Solanki, S.C & Saini, J.S, 2001. "Thermo-hydraulic performance of solar air heaters having integral chamfered rib roughness on absorber plates," Energy, Elsevier, vol. 26(2), pages 161-176.
    2. Chaube, Alok & Sahoo, P.K. & Solanki, S.C., 2006. "Analysis of heat transfer augmentation and flow characteristics due to rib roughness over absorber plate of a solar air heater," Renewable Energy, Elsevier, vol. 31(3), pages 317-331.
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