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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(01) [January 2005] >
| Title: | Simulation and experimental verification of solutal convection in the initial stages of crystal growth from an aqueous solution |
| Authors: | Verma, Sunil
Srivastava, Atul
Prabhakar, Vivek
Muralidhar, K
Wadhawan, V K |
| Keywords: | Computer simulation
Convection
Heat transfer
Crystal growth from solution
Potassium dihydrogen phosphate
Shadowgraphy |
| Issue Date: | Jan-2005 |
| Publisher: | CSIR |
| IPC Code: | C3 0B 7/00 |
| Abstract: | Three-dimensional, unsteady numerical simulation
of transport phenomena during the initial stages of growth of the KDP crystal
from its aqueous solution and comparison with experiments have been presented.
The convective field in the solution is set-up due to density differences
between the supersaturated solution in the bulk and the saturated solution in
the vicinity of the crystal. The flow field in the solution has been visualized
using a shadowgraph technique. Numerical as well as experimental results of the
growth under free convection show that convection is initially set-up in the
vicinity of the crystal, while the solution in the rest of the growth chamber
is relatively stagnant. The initial flow patterns show symmetry to a great
extent. The influence of the crystal rotation on the concentration field has
been additionally studied through numerical simulations. When the crystal is
rotated, the gradients in concentration between the region near to the crystal
and far away from it are high. This is a desirable requirement for a higher
crystal growth rate. With the passage of time, the length scales of convection
span the growth chamber, and a purely unsteady flow field is established. The
numerical simulation could not be continued for such long durations owing to
excessive requirement of computational resources. However, a good agreement
between simulation and experiments for short times indicates that the imaging
of the flow field provides a useful strategy for continuous monitoring of
crystal growth. |
| Page(s): | 24-33 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(01) [January 2005]
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