Developing structure of two-phase flow in a large diameter pipe at low liquid flow rate
スポンサーリンク
概要
- 論文の詳細を見る
In order to develop the interfacial area transport equation for the interfacial transfer terms in the two-fluid model, accurate data sets on axial development of local parameters such as void fraction, interfacial area concentration, interfacial gas velocity and Sauter mean diameter are indispensable to verify the modeled source and sink terms in the interfacial area transport equation. From this point of view, local measurements of both group 1 spherical/distorted bubbles and group 2 cap/slug bubbles in vertical upward air–water two-phase flow in a large diameter pipe with 200 mm in inner diameter and 26 m in height were performed at three axial locations of z/D = 41.5, 82.8 and 113 as well as 11 radial locations from r/R = 0–0.95 by using four-sensor probe method. Here, z, r, D and R are the axial distance from the inlet, radial distance from the pipe center, pipe diameter and pipe radius, respectively. The liquid flow rate and the void fraction ranged from 0.0505 m/s to 0.312 m/s and from 1.98% to 32.6%, respectively in the present experiment. The flow condition covered extensive region of bubbly flow, cap turbulent flow as well as their transition. The extensive analysis on the radial profiles of local flow parameters and their axial developments demonstrate the development of interfacial structures along the flow direction due to the bubble coalescence and breakup and the gas expansion. The significant decrease in void faction and interfacial area concentration and the increase in Sauter mean diameter and interfacial velocity were observed when the gradual flow regime transition occurred. Finally, the net change in the interfacial area concentration due to the bubble coalescence and breakup was quantitatively investigated in the present paper to reflect the true transfer mechanisms in observed two-phase flows.
論文 | ランダム
- 特集 レアメタル
- 経験 PCR法が起因菌決定に有用であった重症肺炎2症例の経験
- 一酸化窒素(NO)吸入により肺動脈圧低下と肺酸素化能の悪化を生じた敗血症を伴う急性呼吸窮迫症候群(ARDS)の1症例
- 地域看護学専攻科における産業保健活動論の教育方法の検討(1)産業現場の見学を導入して
- 「地域看護学見学実習」での学びと今後の課題--実習記録の分析から