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Sheikhzadeh, G. A., Teimouri, H., Mahmoodi, M.. (1391). Numerical Study of Mixed Convection of Nanofluid in a Concentric Annulus with Rotating Inner Cylinder. نشریه علمی دانشگاه سیستان و بلوچستان, 1(1), 26-36. doi: 10.7508/tpnms.2013.01.003
G. A. Sheikhzadeh; H. Teimouri; M. Mahmoodi. "Numerical Study of Mixed Convection of Nanofluid in a Concentric Annulus with Rotating Inner Cylinder". نشریه علمی دانشگاه سیستان و بلوچستان, 1, 1, 1391, 26-36. doi: 10.7508/tpnms.2013.01.003
Sheikhzadeh, G. A., Teimouri, H., Mahmoodi, M.. (1391). 'Numerical Study of Mixed Convection of Nanofluid in a Concentric Annulus with Rotating Inner Cylinder', نشریه علمی دانشگاه سیستان و بلوچستان, 1(1), pp. 26-36. doi: 10.7508/tpnms.2013.01.003
Sheikhzadeh, G. A., Teimouri, H., Mahmoodi, M.. Numerical Study of Mixed Convection of Nanofluid in a Concentric Annulus with Rotating Inner Cylinder. نشریه علمی دانشگاه سیستان و بلوچستان, 1391; 1(1): 26-36. doi: 10.7508/tpnms.2013.01.003

Numerical Study of Mixed Convection of Nanofluid in a Concentric Annulus with Rotating Inner Cylinder

Challenges in Nano and Micro Scale Science and Technology
مقاله 3، دوره 1، شماره 1، فروردین 2013، صفحه 26-36    اصل مقاله (1.84 M)
نوع مقاله: Original Research Paper
شناسه دیجیتال (DOI): 10.7508/tpnms.2013.01.003
نویسندگان
G. A. Sheikhzadeh1؛ H. Teimouri* 1؛ M. Mahmoodi2
1Department of Mechanical Engineering, University of Kashan, Kashan, Iran
2Department of Mechanical Engineering, University of Kashan, Kashan, Iran Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده
In this work, the steady and laminar mixed convection of nanofluid in horizontal concentric annulus with
rotating inner cylinder is investigated numerically. The inner and outer cylinders are kept at constant
temperature Ti and To respectively, where Ti>To. The annular space is filled with Alumina-water nanofluid.
The governing equations with the corresponded boundary conditions in the polar coordinate are discretized
using the finite volume method where pressure-velocity coupling is done by the SIMPLER algorithm.
Numerical results have been obtained for Rayleigh number ranging from 102 to 105, Reynolds number from 1 to 300 and nanoparticles volume fraction from 0.01 to 0.06. The effects of the Reynolds and Rayleigh numbers, average diameter of nanoparticles and the volume fraction of the nanoparticles on the fluid flow and heat transfer inside the annuli are investigated. According to the results, the average Nusselt number decreases with increasing the Reynolds number. However, the average Nusselt number increases by increasing the Rayleigh number. Moreover, the maximum average Nusselt number occurs for an optimal nanoparticle volume fraction except situations that heat conduction predominates over the heat convection. In these conditions the average Nusselt number is close to unity.
کلیدواژه‌ها
Concentric Annulus؛ Finite Volume Method؛ Mixed convection؛ Nanofluid؛ Rotating Inner Cylinder
مراجع
[1] H.Q. Yang, K.T. Yang and J.R. Lloyd, Rotationaleffects on natural convection in a horizontalcylinder, AIChE Journal 34 (1988) 1627-1633.

[2] H.Q. Yang, Diffusion-controlled mass transfer froma rotating cylinder, Numerical Heat Transfer A 23(1993) 303-318.

[3] M. Prudhomme and L. Robillard, Natural convectionin an annular fluid layer rotating at weak angularvelocity. In: Proc. 4th Int. Symp. on TransportPhenomena, Heat and Mass TransferSydney,N.S.W., 1991, p. 38.

[4] F. Ladeinde, Studies on thermal convection in selfgravitatingand rotating horizontal cylinders in avertical external gravity field. 1988).

[5] T.S. Lee, Numerical computation of fluid convectionwith air enclosed between the annuli of eccentricheated horizontal rotating cylinders, Computers andFluids 21 (1992) 355-368.

[6] E. Abu-Nada, Z. Masoud and A. Hijazi, Naturalconvection heat transfer enhancement in horizontalconcentric annuli using nanofluids, InternationalCommunications in Heat and Mass Transfer 35(2008) 657-665.

[7] H.C. Brinkman, The viscosity of concentratedsuspensions and solutions, Journal of ChemicalPhysics 20 (1952).

[8] R.L. Hamilton and O.K. Crosser, Thermalconductivity of heterogeneous two-componentsystem, I&EC Fundamentals 1 (1962) 187-191.

[9] E. Abu-Nada, Effects of variable viscosity andthermal conductivity of Al2O3-water nanofluid onheat transfer enhancement in natural convection,International Journal of Heat and Fluid Flow 30(2009) 679-690.

[10] M. Izadi, A. Behzadmehr and D. Jalali-Vahida,Numerical study of developing laminar forcedconvection of a nanofluid in an annulus,International Journal of Thermal Sciences 48 (2009)2119-2129.

[11] M. Izadi, A. Behzadmehr and D. Jalali-Vahida,Numerical study of developing laminar forcedconvection of a nanofluid in an annulus,International Journal of Thermal Sciences 48 (2009)2119-2129.

[12] N. Masoumi, N. Sohrabi and A. Behzadmehr, A newmodel for calculating the effective viscosity ofnanofluids, Journal of Physics D: Applied Physics42 (2009) 055501.

[13] C.H. Chon, K.D. Kihm, S.P. Lee and S.U.S. Choi,Empirical correlation finding the role of temperatureand particle size for nanofluid (Al2O3) thermalconductivity enhancement, Applied Physics Letters87 (2005) 1-3.

[14] E.E. Feldman, R.W. Hornbeck and J.F. Osterle, Anumerical solution of developing temperature forlaminar developing flow in eccentric annular ducts,International Journal of Heat and Mass Transfer 25(1982) 243-253.

[15] N.H. Abu-Sitta, K. Khanafer, K. Vafai and A.M. Al-Amiri, Combined forced- and natural-convectionheat transfer in horizontally counterrotatingeccentric and concentric cylinders, Numerical HeatTransfer; Part A: Applications 51 (2007) 1167-1186.

[16] M.I. Char and Y.H. Hsu, Computation of buoyancydrivenflow in an eccentric centrifugal annulus witha non-orthogonal collocated finite volume algorithm,International Journal for Numerical Methods inFluids 26 (1998) 323-343.

[17] J. Buongiorno, Convective transport in nanofluids,Journal of Heat Transfer 128 (2006) 240-250.

[18] S. Maiga, S.J. Palm, C.T. Nguyen, G. Roy and N.Galanis, Heat transfer enhancement by usingnanofluids in forced convection flows, InternationalJournal of Heat and Fluid Flow 26 (2005) 530-546.

[19] C.T. Nguyen, F. Desgranges, G. Roy, N. Galanis, T.Mare, S. Boucher and H. Angue Mintsa,Temperature and particle-size dependent viscositydata for water-based nanofluids - Hysteresisphenomenon, International Journal of Heat and FluidFlow 28 (2007) 1492-1506.

[20] K. Khanafer and K. Vafai, A critical synthesis ofthermophysical characteristics of nanofluids,International Journal of Heat and Mass Transfer 54(2011) 4410-4428.

[21] A. Bejan, Convection Heat Transfer, John Wiley &Sons, 2003.

[22] T.H. Kuehn and R.J. Goldstein, An experimentaland theoretical study of natural convection in theannulus between horizontal concentric cylinders,Journal of Fluid Mechanics 74 (1976) 695-719.

[23] J.S. Yoo, Mixed convection of air between twohorizontal concentric cylinders with a cooledrotating outer cylinder, International Journal of Heatand Mass Transfer 41 (1998) 293-302.

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