Unstable Thermocapillary Flow Inside A NaNO. Float Zone
Author(s)
C.T. Nguyen, H. Bazzi & N. Galanis
Abstract
Unstable thermocapillary flow inside a
float zone
C. T. Nguyen', H. Bazzi* & N. Galanis^
* School of Engineering, Universite de Moncton (N. B.), Canada.
^Faculty of Engineering, Universite de Sherbrooke (Quebec), Canada.
Abstract
In this study, we have numerically investigated the problem of the transition from
an axisymmetric state to an unstable i.e. oscillatory state in a liquid float zone
which is held suspended between a pair of coaxial disks. The system of governing
equations corresponding to a time-dependent-3D model was successfully solved
by employing the modified-SIMPLE method. Results have shown that for a low
Marangoni number, the flow consists of a steady, axisymmetric and toroidal
structure exhibiting a 'purely' axial fluid circulation on the free surface. The
vortex center is observed beneath that surface near the hot disk. When the
Marangoni number increases beyond the critical value MacR, MacR« 9750, the
transition to an oscillatory state occurs. The flow and the t
Keywords
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