Abstract
If a light hot block solution is set near the top surface of bulk water, the solution may enlarge beneath the surface owing to the thermal buoyancy. The heat diffuses very faster than the solute and then the density of chilled solution becomes larger than bulk water. Therefore, the solution moves downward with fingers. Numerical analyses of fingers in an enclosure were carried out for a three-dimensional flow by using the finite difference method. Calculations were carried out at the Prandtl number Pr=6, the Lewis number Le=100, the buoyancy ratio N_O=0.5 and the Rayleigh number Ra_O=10_6. The light hot block solution enlarged beneath the surface first, especially for the large block solution. In the case of small block solution, the block solution developed to a single salt-finger with a head and tail. In the case of middle block solution, a single finger with four head fingers were formed after the diffusion of heat. However, in the case of large block solution, the solution enlarged clearly beneath the surface and many salt-fingers occurred with time.
