Abstract
The relaxation time affects significantly the radius of a drop relaxing before spin coating especially for the liquids of low viscosity. Even for a fixed volume of liquid and rotation speed, the initial film thickness and the corresponding rotational Reynolds number are all changed. Furthermore, the critical radius for the onset of rivulet instability is dramatically altered. In the previous study, we reported a “turning phenomenon” for the Coriolis effect: it destabilizes high Bond number flows and stabilizes low Bond number flows. However, a comparison among variations of critical radius with rotational Reynolds numbers for different relaxation times shows that it is not the Coriolis force but the effect of a disturbance in a spreading drop of a fluid of low viscosity that causes this “turning phenomenon”.
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