Transition Process from Laminar to Oscillatory Marangoni Convection in a Liquid Bridge under Normal and Micro Gravity

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  • Transition Process from Laminar to Osci

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This paper will clarify the effect of temperature difference between hot disk and cool disks (L1T), and non-dimensional liquid bridge volume (V /Vo) on the transition process from periodic temperature oscillation to chaotic temperature oscillation under 1 g and µg conditions. As temperature differences between the two disks that were suspending a liquid bridge increased, period doubling cascade was observed (D=5 mm, L=2 mm, V /Vo=90 vol %, v= 1 cSt). The regime of steady and oscillatory states was clarified on the L1T-V /Vo plane under 1 gandµgconditions (D=5 mm, L= 1.6 mm, v=2 cSt). The discontinuity of the boundary line between the steady and oscillatory states was observed at approximately V /Vo=70- 80 vol% under 1 g conditions, while under µg conditions the onset of temperature oscillation was observed at approximately the same range: V /Vo=70-80 vol%. From these results, the critical temperature difference at which the steady state would change to the oscillatory state under µg conditions appeared to be smaller than that under 1 g around V /Vo=70-80 vol%; that is, gravity seemed to be one of the factors in temperature field stability for Marangoni convection. By comparing the regime of periodic and quasi-periodic states on the L1T-V /Vo plane with 1 g and µg conditions, gravity appeared to be one of the instability factors that is related to the transition process from a periodic state to a quasi-periodic state.

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