単一キャビティからの非線形発泡挙動に関する実験的研究

概要

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One of the most difficult and critical factors in modeling of boiling phenomena is the bubbling behavior of nucleation sites. In this work, a single artificial cavity was manufactured on a Cu thin plate and was heated by laser irradiation in a water pool with saturated boiling condition. Three types of artificial cavities were tested, which of those were conical, cylindrical and reentrant. Conical cavities showed highly intermittent bubbling with large temperature fluctuations and required rather high superheat to maintain bubbling. Phase map was reconstructed from the temperature time series and revealed rather simple structure of bubbling. Further nonlinear analysis was carried out and strong possibility of the existence of low dimensional deterministic chaos was indicated. Cylindrical cavities showed continuous and stable bubbling from a rather low superheat. Only small temperature fluctuations were observed and return map was constructed from succeeding bubbling interval, showing from simple to highly nonlinear bubbling behavior. Reentrant cavities showed similar behavior to those of cylindrical type, but little more complicated.
社団法人日本機械学会の論文
2000-12-25