2022年秋の大会

講演情報

一般セッション

III. 核分裂工学 » 304-1 伝熱・流動(エネルギー変換・輸送・貯蔵を含む)

[2L10-15] 気液二相流1

2022年9月8日(木) 14:45 〜 16:25 L会場 (E1棟4F 44番教室)

座長:坂下 弘人(北大)

15:00 〜 15:15

[2L11] Measurement of Bubbly Layer Void Fraction at the Point of Onset of Significant Void in Subcooled Flow Boiling

*Binh Thanh Nguyen1, Tomio OKAWA1, Ryoma TSUJIMURA1 (1. UEC)

キーワード:2 phase flow, Onset of significant void, Void fraction measurement

In two-phase flow, the formation of a large bubble is an important phenomenon, it is directly related to the inception of departure from nucleate boiling. However, thermal-hydraulic condition imposes a strong impact on the point of onset of significant void, therefore it is troublesome to quantitively detect the point of significant void in subcooled flow boiling. Based on the theoretical assumption of the flow regime transition from bubbly flow to slug flow in the subcooled flow boiling at the bubbly layer by Okawa (2021), the critical local void fraction at the point of onset of significant void is said to be 30%. Therefore, in the present study, by the use of an optical void probe, the experimental measurement for the void fraction at the near-heated wall region was done to quantitively verify the critical void fraction at the point of onset of significant void.