Effect of Microbubbles on the Creation of Localized Turbulence in a Circular Pipe Flow
-
- NAKAMURA Kotaro
- 北海道大学工学院
-
- TASAKA Yuji
- 北海道大学工学院
-
- MURAI Yuichi
- 北海道大学工学院
Bibliographic Information
- Other Title
-
- 管内流れの局所乱流塊形成におけるマイクロバブルの影響
- カン ナイ ナガレ ノ キョクショ ランリュウカイ ケイセイ ニ オケル マイクロバブル ノ エイキョウ
Search this article
Abstract
<p>We experimentally examined influences of microbubbles on generation of a localized turbulent puff in a circular pipe flow. Central velocity fluctuations in the pipe flow measured by LDV were utilized to distinguish status of flows: It enables to distinguish ‘decaying disturbances’ that emerges on intermediate state in between puffs and laminar flows. Forty trials to investigate status of flows were performed at different intensity of perturbation controlled to create turbulent puffs at fixed Reynolds number, Re = 1,900 for both of single phase and microbubbly liquid with volume fraction lower than 0.018%. The results indicated that the adding microbubble enhances creation of turbulent puffs and prevents decaying of disturbances. This means that dilute microbubble promotes flow transition. Finally, we quantify the results by using two methods which are based on a velocity dropping value and correlation coefficient. These methods make it possible to classify status of flows in a pipe.</p>
Journal
-
- JAPANESE JOURNAL OF MULTIPHASE FLOW
-
JAPANESE JOURNAL OF MULTIPHASE FLOW 31 (1), 20-28, 2017
THE JAPANESE SOCIETY FOR MULTIPHASE FLOW
- Tweet
Details 詳細情報について
-
- CRID
- 1390001204436689408
-
- NII Article ID
- 130006827662
-
- NII Book ID
- AN10088286
-
- ISSN
- 18815790
- 09142843
-
- NDL BIB ID
- 028082430
-
- Text Lang
- ja
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
-
- Abstract License Flag
- Disallowed