Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

doi:10.1016/j.cjche.2014.10.008

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 22-30.DOI: 10.1016/j.cjche.2014.10.008

Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani

Department of Mechanical Engineering, University of Shahrood, Shahrood, Iran

收稿日期:2013-04-10 修回日期:2014-02-25 出版日期:2015-01-28 发布日期:2015-01-24
通讯作者: Mohsen Nazari

Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani

Department of Mechanical Engineering, University of Shahrood, Shahrood, Iran

Received:2013-04-10 Revised:2014-02-25 Online:2015-01-28 Published:2015-01-24
Contact: Mohsen Nazari

摘要/Abstract

摘要： Double diffusion convection in a cavity with a hot square obstacle inside is simulated using the lattice Boltzmann method. The results are presented for the Rayleigh numbers 10⁴,10⁵ and 10⁶, the Lewis numbers 0.1, 2 and 10 and aspect ratio A (obstacle height/cavity height) of 0.2, 0.4 and 0.6 for a range of buoyancy number N=0 to -4 with the effect of opposing flow. The results indicate that for |N|< 1, the Nusselt and Sherwood numbers decrease as buoyancy ratio increases,while for |N|>1, they increase with |N|. As the Lewis number increases, higher buoyancy ratio is required to overcome the thermal effects and the minimum value of the Nusselt and Sherwood numbers occur at higher buoyancy ratios. The increase in the Rayleigh or Lewis number results in the formation of the multi-cell flow in the enclosure and the vortices will vanish as |N| increases.

关键词: Lattice Boltzmann method, Double diffusion, Hot obstacle, Opposing buoyancy force

Abstract: Double diffusion convection in a cavity with a hot square obstacle inside is simulated using the lattice Boltzmann method. The results are presented for the Rayleigh numbers 10⁴,10⁵ and 10⁶, the Lewis numbers 0.1, 2 and 10 and aspect ratio A (obstacle height/cavity height) of 0.2, 0.4 and 0.6 for a range of buoyancy number N=0 to -4 with the effect of opposing flow. The results indicate that for |N|< 1, the Nusselt and Sherwood numbers decrease as buoyancy ratio increases,while for |N|>1, they increase with |N|. As the Lewis number increases, higher buoyancy ratio is required to overcome the thermal effects and the minimum value of the Nusselt and Sherwood numbers occur at higher buoyancy ratios. The increase in the Rayleigh or Lewis number results in the formation of the multi-cell flow in the enclosure and the vortices will vanish as |N| increases.

Key words: Lattice Boltzmann method, Double diffusion, Hot obstacle, Opposing buoyancy force

Mohsen Nazari, Ladan Louhghalam, Mohamad Hassan Kayhani. Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 22-30.

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Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

Lattice Boltzmann simulation of double diffusive natural convection in a square cavity with a hot square obstacle

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