Secondary instability induced by thermocapillary effect in half-zone liquid bridge of high Prandtl number fluid

We investigate the secondary instability of thermocapillary-driven convection in a high-Pr liquid bridge (Pr = 4) of half-zone geometry via direct numerical simulation. The convection is known to exhibit a three-dimensional time-dependent ‘oscillatory’ state with a distinct azimuthal modal structure, that is, spatio-temporally periodic state after the onset of the primary instability. We indicate that the convection exhibits another transition...