%0 Journal Article
%T The stratification phenomenain the thermal and solutal fields of double-diffusive convection in a circular cylinder<br>The stratification phenomena in the thermal and solutal fields of double-diffusive convection in a circular cylinder
%A Lu Wen-Qiang
%A Shi Kefeng
%A <br>SHI
%A Kefeng
%A LU
%A Wenqiang
%J 科学通报(英文版)
%D 2006
%I 
%X The structure of double diffusive convec-tion in a circular cylinder cavity has been numerically studied. The numerical results exhibit some new characters of non-horizontal stratifications of thermal and solutal fields: in the stratification state, the iso-thermal lines near the sidewall are higher than that near the symmetry axis, while the isoconcentration lines near the symmetry axis are relatively high. The mechanism of these non-horizontal stratifications is illustrated by comparing double-diffusive convection with natural convection driven by thermal buoyancy or solutal buoyancy alone. The effects of Lewis number Le and buoyancy ratio N on the non-hor- izontal stratifications of thermal and solutal fields are also investigated. The results show that: at a given time (t = 0.2), with an increase in Le (Le = 0-15), the area influenced by solute diffusion decreases; for isothermal line, the gradients of it initially increase, but it tends to be horizontal at the top of the cavity when the Lewis number is higher than 10. When N varies from 0 to 2, the isoconcentration lines tend to be horizontal while the gradients of isothermal line increase.
%K circular cylinder
%K natural convection
%K double- diffusive convection
%K buoyancy force
%K stratification phenom-ena<br>自然对流
%K 双向扩散对流
%K 分层现象
%K 传热学
%K 圆筒
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=EAC3F68A39FE785C66AE7EA23BA59587&yid=37904DC365DD7266&vid=987EDA49D8A7A635&iid=B31275AF3241DB2D&sid=F4DCFB3CB96519BF&eid=9409F3EB075DCD5B&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=22