2023-02-08T19:10:24Zhttps://kansai-u.repo.nii.ac.jp/?action=repository_oaipmhoai:kansai-u.repo.nii.ac.jp:000106542023-01-31T06:39:45Z00528:01530:01537
離散気泡モデルによる二相流ダイナミクスの解明jpnTwo-phase flow dynamicsDiscrete bubble modelVoid wave propagationFlow patternProbability density functionOscillatory two-phase flowhttp://hdl.handle.net/10112/5954Journal ArticleInvestigation on Two-phase Flow Dynamics with Discrete Bubble Model網, 健行梅川, 尚嗣小澤, 守庄司, 正弘Conventional modeling including drift-flux model and two-fluid model is based on “continuous flow hypothesis”, being constructed by time-averaging, and thus both phases are defined in every spatio-temporal space. This makes it possible to apply to a variety of two-phase flow dynamics, while the intrinsic void fraction fluctuations, typically observed in slug and churn flows, are hardly simulated. In order to break through such a problem caused by time-averaging, discrete bubble model based on one-dimensional mass conservation equation, i.e. void propagation equation, has been developed. This model takes into account, as momentum effects, the wake effect induced by preceding bubbles, the local pressure fluctuation and the compressibility of gas phase together with the phase re-distribution due to geometrical constrains. Thus obtained spatio-temporal fluctuation characteristics of void fraction well simulated inherent two-phase behavior not only in a steady flow but also in an oscillatory flow.Thermal science and engineering154197209200709189963publisher日本伝熱学会https://kansai-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10654&item_no=1&attribute_id=19&file_no=12019-05-22