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Entropy generation in channels with non-uniform cross-section that can be found in many fluid flow systems is an important concern from the thermodynamic design point of view. In this regard, the entropy generation in channels with periodic wavy sinusoidal walls has been considered in present study. The flow is assumed to be two-dimensional steady laminar and the main parameters considered are the Re number, height ratio Hmin/Hmax and module length ratio L/a. The fluid enters the channel with uniform axial velocity and temperature. The wall of the channel is assumed to be at uniform temperature which is different that of the fluid at the inlet of the channel. The distribution of the entropy generation as well as the total entropy generation has been studied numerically. It is found that the Re number and the geometric parameters, height ratio and module length ratio have significant effect on both the local concentrations of entropy generation as well as the total entropy generation in the channel. Flow separation and re-circulation size, strength and location of flow are found to be major concern in determining the local entropy generation.
PAPER REVISED: 2012-10-24
PAPER ACCEPTED: 2012-10-24
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  1. Sahin, A. Z., A Second Law Comparison for Optimum Shape of Duct Subjected to Constant Wall Temperature and Laminar Flow, Heat and Mass Transfer, 33 (1998), pp. 425-430.
  2. Sahin, A. Z., Irreversibilities in Various Duct Geometries with Constant Wall Heat Flow and Laminar Flow, Energy, 23 (1998), pp. 465-473.
  3. Bahaidarah, H. M. S., Anand, N. K., Chen, H. C., Numerical Study of Heat and Momentum Transfer in Channels with Wavy Walls, Numerical Heat Transfer, Part A, 47 (2005), pp. 417-439.
  4. Kakac, S., Shah, R. K., Aung W. (eds.), Handbook of Single Phase Convective Heat Transfer, Wiley, New York, 1980, pp. 17.1-17.62.
  5. Nishimura, T., Ohori, Y., Kawamura, Y., Flow Characteristics in a Channel with Symmetric Wavy Wall for Steady Flow, Journal of Chemical Engineering, Japan, 17 (1984), pp. 446-471.
  6. Nishimura, T., Murakami, S., Arakawa, S., Kawamura, Y., Flow Observation and Mass Transfer Characteristics in Symmetrical Wavy-Walled Channels at Moderate Reynolds Numbers for Steady Flow, International Journal of Heat and Mass Transfer, 33 (1990), pp. 835-845.
  7. Ali, M. M., Ramadhani, S., Experiments on Convective Heat Transfer in Corrugated Channels, Experimental Heat Transfer 5 (1992), pp. 175-193.
  8. Wang, G., Vanka, S. P., Convective Heat Transfer in Wavy Passage, International Journal of Heat and Mass Transfer, 38 (1995), pp. 3219-3230.
  9. Stone, K., Vanka, S. P., Numerical Study of Developing Flow and Heat Transfer in a Wavy Passage, Journal of Fluid Engineering, 121 (1999), pp. 713-719.
  10. Niceno, B., Nobile, E., Numerical Analysis of Fluid Flow and Heat Transfer in Periodic Wavy Channel, International Journal of Heat and Fluid Flow, 22 (2001), pp. 156-167.
  11. Abbassi, H., Magherbi, M., Ben Brahim, A., Entropy generation in Poiseuille-Benard channel flow, International Journal of Thermal Sciences 42 (2003), pp. 1081-1088.
  12. Haddad, O. M., Alkam, M. K., Khasawneh, M. T., Entropy generation due to laminar forced convection in the entrance region of a concentric annulus, Energy 29 (2004), pp. 35-55.
  13. Ko, T. H., Cheng, C. S., Numerical investigation on developing laminar forced convection and entropy generation in a wavy channel, International Communications in Heat and Mass Transfer 34 (2007), pp. 924-933.
  14. Ko, T. H., Effects of corrugation angle on developing laminar forced convection and entropy generation in a wavy channel, Heat and Mass Transfer 44 (2007), pp. 261-271.
  15. Mahmud, S., Sadrul Islam, A. K. M., Laminar free convection and entropy generation inside an inclined wavy enclosure, International Journal of Thermal Sciences, 42 (2003), 11, pp. 1003-1012.
  16. Mahmud, S., Fraser, R. A., Free Convection and Entropy Generation Inside a Vertical In-Phase Wavy Cavity, International Communications in Heat and Mass Transfer, 31 (2004), pp. 455-566.
  17. Ko, T. H., Numerical analysis of entropy generation and optimal Reynolds number for developing laminar forced convection in double-sine ducts with various aspect ratios, International Journal of Heat and Mass Transfer 49 (2006), pp. 718-726.
  18. Floryan, J. M., Vortex Instability in a Converging-Diverging Channel, Journal of Fluid Mechanics 482 (2003), pp.17-50.
  19. Floryan, J. M., Floryan, C., Travelling Wave Instability in a Diverging-Converging Channel, Fluid Dynamics Research 42 (2010) 025509.
  20. Hoffman, J. D., Numerical Methods for Engineers and Scientists, McGraw-Hill, New York, 1992.
  21. Arpaci, V. S., Larsen, P. S., Convection Heat Transfer, Prentice Hall, New Jersey, 1984.
  22. Incropera, F. P., DeWitt, D. P., Fundamentals of Heat and Mass Transfer, Wiley, New York, 1996.

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