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Abstract
Dynamic and static force balances were applied to analyze bubble departure processes on a flat plate and on a thin wire. For the flat plate cases, the dominating forces were the pressure force, the surface tension force, and the buoyancy force. The departure radius under microgravity might diverge to infinity, approach a constant, or have no solution for asymptotic growth period. For the thin wire case, force balance with the attached region taken as a narrow rectangle was analyzed and from which the dominating forces were the drag force and the pressure force. Bubble departure radius under microgravity approached a constant when valid solution existed. Experimental observations in literature agreed well with the present analysis. The safety problem was also discussed in this study.