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Entropy generation in Poiseuille-Benard channel flow.

Author(s) : ABBASSI H., MAGHERBI M., BEN BRAHIM A.

Type of article: Article

Summary

The issue of entropy generation in Poiseuille-Benard channel flow is analysed by solving numerically the mass, momentum and energy equations with the use of the classic Boussinesq incompressible approximation. The numerical scheme is based on Control Volume Finite Element Method with the SIMPLER algorithm for pressure-velocity coupling. Results are obtained for Rayleigh numbers Ra and irreversibility Ø ranging from 1000 to 5 x 10000 and from 0,0001 to 10 respectively. Variations of entropy generation and the Bejan number as a function of Ra and Ø are studied. The limit value Ø(1) for which entropy generation due to heat transfer is equal to entropy due to fluid friction is evaluated. It has been found that Ø(1) is a decreasing function of the Rayleigh number Ra. Ø(1) varies from 0.015 to 0.096 when Ra decrease from 5 x 10000 to 1000. Steam lines and entropy generation maps are plotted at six times over one period at Ra = 10000 and Ø = 1000. It has been found that the maximum entropy generation is localized at areas where heat exchanged between the walls and the flow is maximum. No significant entropy production is seen in the main flow.

Details

  • Original title: Entropy generation in Poiseuille-Benard channel flow.
  • Record ID : 2004-1599
  • Languages: English
  • Source: International Journal of thermal Sciences - vol. 42 - n. 12
  • Publication date: 2003/12

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