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Simulation of Natural Convection in Eccentric Annulus: A Combined Lattice Boltzmann and Smoothed Profile Approach | ||
| AUT Journal of Mechanical Engineering | ||
| مقاله 2، دوره 2، شماره 1، شهریور 2018، صفحه 13-26 اصل مقاله (2.77 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2017.13013.5500 | ||
| نویسندگان | ||
| S. jafari1؛ S. afari* 2؛ M. Rahnama1 | ||
| 1Mechanical Engineering Department, ShahidBahonar university of Kerman, Kerman, Iran | ||
| 2Petroleum Engineering Department, ShahidBahonar university of Kerman, Kerman, Iran | ||
| چکیده | ||
| In the present study, a hybrid method of thermal lattice Boltzmann and smoothed profile methods have been applied to simulate free convection in an eccentric annulus with a constant temperature wall. Smoothed profile method employs an Eulerian approach to consider the fluid-solid interaction without using an extra mesh for capturing solid boundary. As a result of this property, the combination of this method and Lattive Boltzmann method can be considered as an efficient method to simulate free convection in complex geometries like annulus. In order to investigate the effect of inner cylinder position on the natural convection, the inner cylinder was placed in different horizontal, vertical and diagonal positions. Influences of the Rayleigh number (103 ≤ Ra ≤ 105), eccentricity (-0.75 ≤ e ≤ 0.75)) and the radial ratio (Ro /Ri=2, 2.6 and 3.2) on the streamlines, isotherms and Nusselt number were studied. It was found that the Nusselt number has a positive relationship with Rayleigh number and radial ratio. Also, it can be confirmed that Nusselt number in the case with the negative eccentricity (e=−0.75) was larger than the others. It was found that a very good agreement exists between the present results and those from the open literature. | ||
| کلیدواژه‌ها | ||
| Lattice Boltzmann method؛ Natural convection؛ Smoothed profile method؛ Annulus | ||
| مراجع | ||
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[1] H. Dawood, H. Mohammed, N.A.C. Sidik, K. Munisamy, M. Wahid, Forced, natural and mixed-convection heat transfer and fluid flow in annulus: A review, International Communications in Heat and Mass Transfer, 62 (2015) 45-57. [2] T. Kuehn, R. Goldstein, An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders, Journal of Fluid mechanics, 74(4) (1976) 695-719. [3] T.H. Kuehn, R. Goldstein, An experimental study of natural convection heat transfer in concentric and eccentric horizontal cylindrical annuli, Journal of Heat Transfer, 100(4) (1978) 635-640. [4] T.H. Kuehn, R.J. Goldstein, A parametric study of Prandtl number and diameter ratio effects on natural convection heat transfer in horizontal cylindrical annuli, Journal of Heat Transfer, 102(4) (1980) 768-770. [5] G. Guj, F. Stella, Natural convection in horizontal eccentric annuli: numerical study, Numerical Heat Transfer, Part A: Applications, 27(1) (1995) 89-105.
[6] F. Shahraki, Modeling of buoyancy-driven flow and heat transfer for air in a horizontal annulus: effects of vertical eccentricity and temperature-dependent properties, Numerical Heat Transfer: Part A: Applications, 42(6) (2002) 603-621.
[7] S. Succi, S. Succi, The lattice Boltzmann equation: for fluid dynamics and beyond, Oxford university press, 2001.
[8] Z. Guo, C. Shu, Lattice Boltzmann method and its applications in engineering, World Scientific, 2013.
[9] C.K. Aidun, J.R. Clausen, Lattice-Boltzmann method for complex flows, Annual review of fluid mechanics, 42 (2010) 439-472.
[10] X. He, S. Chen, G.D. Doolen, A novel thermal model for the lattice Boltzmann method in incompressible limit, Journal of Computational Physics, 146(1) (1998) 282-300.
[11] X. Shan, Simulation of Rayleigh-Bénard convection using a lattice Boltzmann method, Physical Review E, 55(3) (1997) 2780.
[12] Y. Wei, H.-S. Dou, Z. Wang, Y. Qian, W. Yan, Simulations of natural convection heat transfer in an enclosure at different Rayleigh number using lattice Boltzmann method, Computers & Fluids, 124 (2016) 30-38.
[13] Y. Peng, Y. Chew, C. Shu, Numerical simulation of natural convection in a concentric annulus between a square outer cylinder and a circular inner cylinder using the Taylor-series-expansion and least-squares-based lattice Boltzmann method, Physical Review E, 67(2) (2003) 026701. [14] S. Dash, T. Lee, H. Huang, Natural convection from an eccentric square cylinder using a novel flexible forcing IB-LBM method, Numerical Heat Transfer, Part A: Applications, 65(6) (2014) 531-555.
[15] T. Seta, Implicit temperature-correction-based immersed-boundary thermal lattice Boltzmann method for the simulation of natural convection, Physical Review E, 87(6) (2013) 063304.
[16] Y. Shi, T. Zhao, Z. Guo, Finite difference-based lattice Boltzmann simulation of natural convection heat transfer in a horizontal concentric annulus, Computers & Fluids, 35(1) (2006) 1-15.
[17] E. Sourtiji, D. Ganji, S. Seyyedi, Free convection heat transfer and fluid flow of Cu–water nanofluids inside a triangular–cylindrical annulus, Powder Technology, 277 (2015) 1-10.
[18] M. Afrand, Using a magnetic field to reduce natural convection in a vertical cylindrical annulus, International Journal of Thermal Sciences, 118 (2017) 12-23.
[19] Z. Guo, C. Zheng, B. Shi, An extrapolation method for boundary conditions in lattice Boltzmann method, Physics of Fluids, 14(6) (2002) 2007-2010.
[20] E. Fattahi, M. Farhadi, K. Sedighi, Lattice Boltzmann simulation of natural convection heat transfer in eccentric annulus, International journal of thermal sciences, 49(12) (2010) 2353-2362.
[21] C.S. Peskin, Flow patterns around heart valves: a numerical method, Journal of computational physics, 10(2) (1972) 252-271.
[22] X. Niu, C. Shu, Y. Chew, Y. Peng, A momentum exchange-based immersed boundary-lattice Boltzmann method for simulating incompressible viscous flows, Physics Letters A, 354(3) (2006) 173-182.
[23] Z.-G. Feng, E.E. Michaelides, Proteus: a direct forcing method in the simulations of particulate flows, Journal of Computational Physics, 202(1) (2005) 20-51.
[24] H. Jeong, H. Yoon, M. Ha, M. Tsutahara, An immersed boundary-thermal lattice Boltzmann method using an equilibrium internal energy density approach for the simulation of flows with heat transfer, Journal of Computational Physics, 229(7) (2010) 2526-2543.
[25] S. Jafari, R. Yamamoto, M. Rahnama, Lattice-Boltzmann method combined with smoothed-profile method for particulate suspensions, Physical Review E, 83(2) (2011) 026702.
[26] Y. Nakayama, R. Yamamoto, Simulation method to resolve hydrodynamic interactions in colloidal dispersions, Physical Review E, 71(3) (2005) 036707.
[27] Y. Hu, D. Li, S. Shu, X. Niu, An efficient smoothed profile-lattice Boltzmann method for the simulation of forced and natural convection flows in complex geometries, International Communications in Heat and Mass Transfer, 68 (2015) 188-199.
[28] M.-I. Char, Y.-H. Hsu, Comparative analysis of linear and nonlinear low-Reynolds-number eddy viscosity models to turbulent natural convection in horizontal cylindrical annuli, Numerical Heat Transfer, Part A Applications, 33(2) (1998) 191-206. | ||
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