THERMAL-CONVECTION IN PHYSICAL VAPOR TRANSPORT OF MERCUROUS CHLORIDE (HG2CL2) FOR RECTANGULAR ENCLOSURES

Citation
Gt. Kim et al., THERMAL-CONVECTION IN PHYSICAL VAPOR TRANSPORT OF MERCUROUS CHLORIDE (HG2CL2) FOR RECTANGULAR ENCLOSURES, Modelling and simulation in materials science and engineering, 5(3), 1997, pp. 289-309
Citations number
25
Categorie Soggetti
Material Science","Physics, Applied
ISSN journal
09650393
Volume
5
Issue
3
Year of publication
1997
Pages
289 - 309
Database
ISI
SICI code
0965-0393(1997)5:3<289:TIPVTO>2.0.ZU;2-O
Abstract
The convective Bow structures in the physical vapour transport process for mercurous chloride (Hg2Cl2) are investigated for two-dimensional rectangular enclosures at various aspect ratios (width-to-transport le ngth) and two different wall boundary conditions: conducting and insul ating. For a low aspect ratio of 0.124, the core of the flow is domina ted by a unicellular convective structure at a Rayleigh number 1.51 x 10(4) for conducting walls. For increasing Rayleigh number, the flow f ield bifurcates to asymmetric multicells. In contrast to conducting wa ll boundary conditions, the insulating wall boundary conditions tend t o suppress the formation of secondary cells. As the aspect ratio decre ases, the Rayleigh number at which transient convective flow arises de creases.