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this study the influence of Brownian motion models on fluid flow, heat transfer and entropy generation in nanofluid forced convection with variable properties has been numerically inspected in a enclosure with central heat source. The governing equations were solved by finite volume method and SIMPLER algorithm. The numerical study was carried out for Reynolds numbers between 10 and 1000 and nanoparticles volume fraction between 0 and .04. The numerical results show that for all investigated models the average Nusselt number increases by nanoparticle volume fraction increment in all Reynolds number. The overall entropy generation behavior is similar to average Nusselt number variation for all inspected models. Among all analyzed models the estimation of Maxwell-Brinkman and Das-Vajjha [30] Models are mainly closed to each other.
PAPER REVISED: 2017-09-04
PAPER ACCEPTED: 2017-09-22
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  1. Ho, C.J. Chen, M.W. "Simulation of natural convection of nanofluid in a square enclosure: effects due to uncertainties of viscosity and thermal conductivity", Int. J. Heat Mass Transfer, Vol. 51, pp.4506-4516, 2008.
  2. Cengel, Y.A. Boles, M.A. "Thermodynamics an Engineering Approach", fifth ed., McGraw-Hill, 2006.
  3. Rosen, A " e ond-law analysis: approa h and impli ations" Int J. Energy, Vol. 33. pp. 415-429, 1999.
  4. Syam Sundar, L. Sharma, K.V. "Heat transfer enhancements of low volume concentration Al2O3 nanofluid with longitudinal strip inserts in a tube", Int. J.l of Heat and Mass Transfer, Vol. 53, pp.4280-4286, 2010.
  5. Keshavarz Moraveji, M. Razvarz,S. "Experimental investigation of aluminum oxide nanofluid on heat pipe thermal performance", Int. Com. Heat and Mass Transfer, Vol. 39, pp. 1444-1448, 2012.
  6. Keshavarz Moraveji, M. Haddad, S.M.H. Darabi, M. "Modeling of forced convective heat transfer of a non-Newtonian nanofluid in the horizontal tube under constant heat flux with computational fluid dynamics", International Communications in Heat and Mass Transfer, Vol. 39, pp. 995-999, 2012.
  7. Yang, C. Li, W. Nakayama, A. "Convective heat transfer of nanofluids in a concentr ic annulus", Int. J. Thermal Sciences Vol. 71, pp. 249 -257, 2013.
  8. Mohammed, H.A. Hasan,H.A. Wahid,M.A. "Heat transfer enhancement of nanofluids in a double pipe heat exchanger with louvered strip inserts", Int. Comm.s in Heat and Mass Transfer, Vol. 40, pp. 36 -46, 2013.
  9. u hopadhyay A "Analysis of entropy eneration due to natural convection in square enclosures with multiple dis rete heat sour es" Int. Comm. Heat and Mass Transfer, Vol. 37, pp. 867-872, 2010.
  10. Shahi, M. Mahmoudi, A H Honarba hsh Raouf A "Entropy eneration due to natural on e tion cooling of a nanofluid" International Communi ations in Heat and ass Transfer Vol 8 Pp 972-983, 2011.
  11. Khorasanizadeh, H Amani i far "Investigation of Cu-water nanofluid natural convection and entropy eneration with an embedded ondu ti e baffle" ientia Iranica, Vol. 19, pp. 55-63, 2012.
  12. H horasanizadeh i far Amani "Entropy eneration of Cu-water nanofluid mixed convection in a a ity" European ournal of e hani s B/Fluids Vol 7 pp 1 -152, 2013.
  13. Cho, C. Chen, C Chen " atural onvection heat transfer and entropy generation in wavy-wall enclosure containing water-based nanofluid" Inte. J.. of Heat and Mass Transfer, Vol. 61, pp. 749-758, 2013.
  14. Cho, C. "Heat transfer and entropy generation of natural convection in nanofluid-filled square cavity with partially-heated wavy surface", International Journal Thermophysics, Vol. 77, pp. 818-827, 2014.
  15. Wang, Z. L. Tang, D.W. Liu,S. Zheng, X.H. Araki, N. "Thermal-Conductivity and Thermal-Diffusivity easurements of anofluids by ω ethod and Mechanism Analysis of Heat Transport", International Journal Thermophysics, Vol. 28, pp. 1255-1268, 2007.
  16. Nie, C. Marlow, W.H. Hassan, Y.A. "Discussion of proposed mechanisms of thermal conductivity enhan ement in nanofluids", International Journal of Heat and Mass Transfer, Vol. 51, pp. 1342-1348, 2008.
  17. Patel, H.E. Sundararajan, T. Pradeep, T. Dasgupta, A. Dasgupta, N. Das, S.K. "A micro-convection model for thermal ondu ti ityof nanofluids", Journal of Physics, Vol. 65, pp. 863-869, 2005.
  18. Wang,X. Li, D. Jiao H., "Heat Transfer Enhancement of CuO-water Nanouids Considering Brownian Motion of Nanoparticles ", J. Information & Computational Science, Vol. 9, pp. 1223-1235, 2012.
  19. Masoumi, N. Sohrabi, N. Behzadmehr, A. A new model for calculating the effective viscosity of nanofluids ournal Physi s Vol 2 pp -51, 2009.
  20. Ghasemi, B. Aminossadati, S.M. "Brownian motion of nanoparticles in a triangular enclosure with natural convection", International Journal of Thermal Sciences, Vol. 49, pp. 931-940, 2010
  21. Pakravan, H.A. Yaghoubi, M. "Combined thermophoresis, Brownian motion and Dufour effec ts on natural convection of nanofluids", International Journal of Thermal Sciences, Vol. 50, pp. 394 - 402, 2011.
  22. Wang,X. Li, D. Jiao H., "Heat Transfer Enhancement of CuO-water Nanouids Considering Brownian Motion of Nanoparticles ", J. Information & Computational Science, Vol. 9, pp. 1223-1235, 2012.
  23. Haddad, Z. Abu-Nada, E., "Natural convection in nanofluids: Are the thermophoresis and Brownian motion effects significant in nanofluid heat transfer ", Int. J. Thermal Sciences, Vol. 57, pp. 152 -162, 2012.
  24. Seyf, H.R. Nikaaein, B. "Analysis of Brownian motion and particle size effects on the thermal behavior and cooling performance of microchannel heat sinks", Int. J. of Thermal Sciences, Vol. 58, pp. 36-44, 2012.
  25. V. Bianco, O. Manca, S. Nardini, Entropy generation analysis of turbulent convection flow of Al2O3-water nanofluid in a circular tube subjected to constant wall heat flux, Vol.77, 306-314, 2014.
  26. V. Bianco, O. Manca, S. Nardini, Second Law Analysis of Al2O3-Water Nanofluid Turbulent Forced Convection in a Circular Cross Section Tube with Constant Wall Temperature, Advances in Mechanical Engineering, Volume 2013, Article ID 920278, 12 pages.
  27. Brinkman, H C "The is osity of on entrated suspensions and solution" J. Chemical Physics, Vol. 20, pp. 571-581, 1952.
  28. J.C., Maxwell-Garnett," Colours in metal glasses and in metallic films", Philos. Trans. Roy. Soc. A. Vol. 203. pp. 385-420, 1904
  29. Koo, J. Kleinstreuer, C. " A new thermal conductivity model for nanofluids", J. Nanoparticle Research, Vol. 6, pp. 577-588, 2004.
  30. Vajjha, R.S. Das, D.K. "Experimental determination of thermal ondu ti ity of three nanofluids and development of new correlations", Int. J. Heat and Mass Transfer, Vol. 52, pp. 4675-4682, 2009.
  31. Patankar, S.V." Numerical Heat Transfer and Fluid Flow, McGraw-Hill", Washington DC, 1980
  32. Chamkhaa, A.J, Abu- ada E " ixed on e tion flow in sin le- and double-lid driven square cavities filled with water-Al2O nanofluid: Effe t of is osity models" Eur. J. of Mechanics B/Fluids, Vol. 36, pp. 82-96, 2012.

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