Open AccessSimulation of the influence of convection velocity on upstream dendritic growth using phase-field method
Author(s) -
Yujuan Chen,
Changle Chen
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.4585
Subject(s) - upstream (networking) , dendrite (mathematics) , crystal (programming language) , supercooling , materials science , convection , crystal growth , phase (matter) , mechanics , field (mathematics) , growth velocity , flow (mathematics) , upstream and downstream (dna) , vector field , physics , thermodynamics , geometry , biology , computer network , mathematics , quantum mechanics , computer science , pure mathematics , programming language , endocrinology
The phase-field model based on the Tong and Beckermann model coupled with the flow field is used to simulate two-dimensional microstructural dendrite growth of metal by way of finite difference method. The effect of different convection velocities on metal dendritic crystal growth is studied. The result shows that the upstream and downstream dendritic crystal present asymetric pattern: the growth velocity of upstream is much fasfer than downstream. As the velocity of convection increasesactual supercooling of upstream dendritic crystal increasesthe growth velocity of dendritic crystalis also speeded up. This is because of the bigger convection velocity leads to stronger flushing to the upstream dendritic crystal and the greater actual supercooling of upstream dendritic crystalmaking the dendritic crystal to grow faster.