THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Omar A. Melhem

,

Ahmet Z. Sahin

,

Bekir S. Yilbas

ENTROPY GENERATION DUE TO EXTERNAL FLUID FLOW AND HEAT TRANSFER FROM A CYLINDER BETWEEN PARALLEL PLANES

ABSTRACT
In the present study, second law analysis is introduced for circular cylinder confined between parallel planes. An analytical approach is adopted to study the effects of block age, Reynolds and Prandtl numbers on the entropy generation due to the laminar flow and heat transfer. Four different fluids are considered in the present analysis for comparison purposes. Heat transfer for the cylinder at an isothermal boundary condition is incorporated. In general, the entropy generation rate decreases as the blockage ratio decreases. In addition, the entropy generation rate increases with increasing Reynolds and Prandtl numbers. At a fixed Reynolds number, the effect of block age becomes more notice able for higher Prandtl number fluid. Similarly, for the same fluid, the effect of block age becomes more no tice able as the Reynolds number increases.
KEYWORDS
heat, cylinder, parallel planes, entropy
PAPER SUBMITTED: 2014-11-04
PAPER REVISED: 2015-04-29
PAPER ACCEPTED: 2015-05-07
PUBLISHED ONLINE: 2015-06-07
DOI REFERENCE: https://doi.org/10.2298/TSCI141104068M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 2, PAGES [841 - 848]
REFERENCES
  1. Poulikakos, D. and Johnson J.M., Second law analysis of combined heat and mass transfer phenomena in external flow, Energy, 14 (1989), 2, pp. 67 - 73.
  2. Fowler, A.J. and Bejan A., Correlation of optimal sizes of bodies with external forced convection heat transfer, International Communications in Heat and Mass Transfer, 21 (1994), pp. 17 - 27.
  3. Abu-Hijleh B., Entropy generation in laminar convection from an isothermal cylinder in cross flow. Energy, 23 (1998), 10, pp. 851 - 857.
  4. Demirel, Y. and Kahraman, R., Thermodynamic analysis of convective heat transfer in an annular packed bed, International Journal of Heat and Fluid Flow, 21 (2000), pp. 442 - 448.
  5. Sadeghipour, M.S. and Razi, Y.P., Natural convection from a confined horizontal cylinder: the optimum distance between the confining walls, International Journal of Heat and Mass Transfer, 44 (2001), pp. 367 - 374.
  6. Naphon, P., Second law analysis on the heat transfer of the horizontal concentric tube heat exchanger, International Communications in Heat and Mass Transfer, 33 (2006), pp. 1029 - 1041.
  7. Taufiq, B.N., Masjuki, H.H., Mahlia, T.M.I., Saidur, R., Faizul, M.S. and Mohamad, E.N., Second law analysis for optimal thermal design of radial fin geometry by convection, Applied Thermal Engineering, 27 (2007), pp. 1363 - 1370.
  8. Haseli, Y., Dincer, I. and Naterer, G.F., Optimum temperatures in a shell and tube condenser with respect to exergy, International Journal of Heat and Mass Transfer, 51 (2008), pp. 2462 - 2470.
  9. Ibrahim, E. and Moawed, M., Forced convection and entropy generation from elliptic tubes with longitudinal fins, Energy Conversion and Management, 50 (2009), pp. 1946 - 1954.
  10. Nwosu, N.P., Employing exergy-optimized pin fins in the design of an absorber in a solar air heater, Energy, 35 (2010), 2, pp. 571 - 575.
  11. Khan, W.A., Culham, J.R., and Yovanovich, M.M., Fluid flow and heat transfer from a cylinder between parallel planes, Journal of Thermophysics and Heat Transfer, 18 (2004), 3, pp. 395 - 403.
  12. Hajmohammadi, M.R., Eskandari, H., Saffar-Avval, M. and Campo, A., A new configuration of bend tubes for compound optimization of heat and fluid flow, Energy, 62 (2013), pp. 418-424.
  13. Bahaidarah, H.M.S. and Sahin, A.Z., Thermodynamic analysis of fluid flow in channels with wavy sinusoidal walls, Thermal Science, 17 (2013), 3, pp. 813 - 822.
  14. Razavi S.E., Soltanipour, H. and Choupani P., Second law analysis of laminar forced convection in a rotating curved duct, Thermal Science, 19 (2015), 1, pp. 95 - 107.
  15. Atashafrooz M., Gandjalikhan N.S.A. and Ansari A.B., Numerical investigation of entropy generation in laminar forced convection flow over inclined backward and forward facing steps in a duct under bleeding condition, Thermal Science, 18 (2014), 2, pp. 479 - 492.
  16. Incropera F.P. and DeWitt D.P. Fundamentals of Heat and Mass Transfer 5th ed. John Wiley & Sons, Inc. NJ, 2002.
  17. Bejan, A. Entropy Generation Minimization. CRC Press, Inc., Florida, 1996.
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Entropy generation due to external fluid flow and heat transfer from a cylinder between parallel planes

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