https://scholars.lib.ntu.edu.tw/handle/123456789/81487
標題: | Onset of Salt-Finger Convection in Anisotropic and Inhomogeneous Porous Media | 作者: | 陳發林 Lu, J. W. Chen, Falin |
公開日期: | 1992 | 卷: | v.35 n.12 | 起(迄)頁: | 3451-3464 | 來源出版物: | International Journal of Heat and Mass Transfer | 摘要: | In the experiment of directional solidification of binary solutions, the salt-finger convection is usually found to occur prior to the onset of plume convection. The plume containing cold solute-rich liquid is ejected from the dendritic mushy zone, an anisotropic and inhomogeneous porous medium. The salt-finger convection is accordingly believed to be responsible for the formation of plume convection. In this paper, we seek the relation between the onset of salt-finger and plume convection in the mushy zone by a linear stability analysis. We begin with a general study on the influences of the anisotropic and inhomogeneous permeability, thermal diffusivity, and solute diffusivity on the stability characteristics of salt-finger convection in the porous medium. Based on the results obtained, we consider the salt-finger instability in a real dendritic mushy zone identified from the experiment and find that the onset solute Rayleigh number Rsmc of salt-finger convection is invariably much larger than that of plume convection. It is therefore our belief that there is no salt-finger convection in the mush when the plume is initially ejected from the mush. © 1992. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/123852 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026977401&doi=10.1016%2f0017-9310%2892%2990231-G&partnerID=40&md5=6f7a6b365980baa231c75e6f99945c7d |
ISSN: | 00179310 | DOI: | 10.1016/0017-9310(92)90231-G | SDG/關鍵字: | Porous materials; Solidification; Solutions; Stability; Thermal diffusion; Binary solutions; Directional solidification; Mushy zone; Plume convection; Salt-finger convection; Heat convection |
顯示於: | 應用力學研究所 |
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