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Color-coded visualization of microbubble clouds interacting with eddies in a spatially developing turbulent boundary layer

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Title: Color-coded visualization of microbubble clouds interacting with eddies in a spatially developing turbulent boundary layer
Authors: Park, Hyun Jin Browse this author
Saito, Daichi Browse this author
Tasaka, Yuji Browse this author →KAKEN DB
Murai, Yuichi Browse this author →KAKEN DB
Keywords: Drag reduction
Turbulent boundary layer
Flow visualization
Issue Date: Dec-2019
Publisher: Elsevier
Journal Title: Experimental thermal and fluid science
Volume: 109
Start Page: UNSP 109919
Publisher DOI: 10.1016/j.expthermflusci.2019.109919
Abstract: Three-dimensional distribution of microbubbles dispersed in a turbulent boundary layer spatially developing along a flat plate is investigated experimentally. The aim of study is to find out visually how microbubbles interact with turbulent eddies to achieve frictional drag reduction on a wall. Setting conditions of the experiments are stream Reynolds number up to 2.3 x 10(4), microbubble volume fraction inside boundary layer less than 10(-5), and microbubble Stokes number smaller than 10(-3). Stream-wise vortices in the boundary layer were visualized by flake optics, of which spacing expands with injection of microbubbles. 3-D microbubble distributions were visualized by a color-coded volumetric illumination. The result showed preferentially accumulated microbubble clouds to low-speed streaks close to viscous sublayer and to hair-pin vortices in the buffer layer, leading to reduced diffusivity of microbubbles relative to the turbulent momentum diffusivity.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 朴 炫珍

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