Filling a hole by capillary flow of liquid metal–equilibria and instabilitiesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:The importance of the problem of hole-filling by a molten metal lies in the application of brazing for repairs in space, under microgravityconditions. The negligible effects of gravity and dominance of capillary forces can be approximated under terrestrial conditions, providedthat the hole and the quantity of liquid are small, as quantified by the Bond number. In this paper, we report experimental results, modeling,and analysis of the hole-filling problem using the liquid aluminum brazing alloy on aluminum substrate. Depending on the hole size, thecapillary driven flow may result in the hole being either filled or not filled. The equilibrium problem (energy minimization) has multiplesolutions in some regions of the parameter space. Therefore, the experimental outcomes may depend on the availability of sufficiently strongperturbation, required to dislodge the system from a metastable equilibrium. We report good agreement between experimental results andtheoretical/computational predictions. In general, a deeper and narrower hole favors the filled outcome.