Flow structures and dynamics in the wakes of sliding bubbles

被引：20

作者：

Meehan, R. O'Reilly ^{[1
]}

Donnelly, B. ^{[2
]}

Nolan, K. ^{[2
]}

Persoons, T. ^{[1
]}

Murray, D. B. ^{[1
]}

机构：

[1] Trinity Coll Dublin, Dept Mech & Mfg Engn, Dublin 2, Ireland

[2] Nokia, Bell Labs Res, Efficient Energy Transfer nET Dept, Thermal Management Res Grp, Dublin 15, Ireland

来源：

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | 2016年 / 84卷

关键词：

Sliding bubble; Wake structures; Particle image velocimetry; HEAT-TRANSFER; REYNOLDS-NUMBER; WALL; SPHERE; MODEL; TUBE;

D O I：

10.1016/j.ijmultiphaseflow.2016.03.010

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

An experimental investigation is reported for the flow structures in the wake of an air bubble sliding under an inclined surface in quiescent water. Time-resolved particle image velocimetry (PIV) is used to study the wakes of sliding bubbles for a range of measurement planes, bubble diameters and surface inclination angles. Additionally, key aspects of the bubble's motion are measured simultaneously using a novel method that accounts for the motion of the bubble's interface. Thus, vortex shedding may be linked to changes in the bubble shape and path. Analysis of the measured velocity and vorticity fields reveals a wake structure consisting of a near wake that moves in close proximity to the bubble, shedding vorticity at the inversion points of the bubble path. Downstream of the bubble in the far wake, these structures evolve into asymmetrical, oppositely oriented hairpin vortices that are generated in the near wake. These hairpin vortices bear similarities to those observed behind freely rising bubbles and near-wall bluff bodies and are found to cause significant motion of the bulk fluid. This bulk fluid motion has the potential to offer significant convective cooling of adjacent heated surfaces, such as submerged electronics components. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：145 / 154

页数：10

共 29 条

[11] Numerical investigation of rising bubble wake and shape variations
Gaudlitz, Daniel
Adams, Nikolaus A.
[J]. PHYSICS OF FLUIDS, 2009, 21 (12) : 1 - 9
[12] Greco M, 2005, WIT TRANS BUILT ENV, V84, P205
[13] Heat transfer to sliding bubbles on a tube under evaporating and non-evaporating conditions
Houston, SD
Cornwell, K
[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1996, 39 (01) : 211 - 214
[14] Model and experiments of a drop impinging on an immersed wall
Klaseboer, E
Chevaillier, JP
Maté, A
Masbernat, O
Gourdon, C
[J]. PHYSICS OF FLUIDS, 2001, 13 (01) : 45 - 57
[15] Lunde K., 1997, ASME FED SUMM M VANC
[16] BUBBLE RISE UNDER AN INCLINED PLATE
MAXWORTHY, T
[J]. JOURNAL OF FLUID MECHANICS, 1991, 229 : 659 - 673
[17] An experimental investigation of the motion of single bubbles under a slightly inclined surface
Perron, A.
Kiss, L. I.
Poncsak, S.
[J]. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2006, 32 (05) : 606 - 622
[18] Persoons T., 2014, P 17 LISB S APPL LAS
[19] Model and experimental visualizations of the interaction of a bubble with an inclined wall
Podvin, B.
Khoja, S.
Moraga, F.
Attinger, D.
[J]. CHEMICAL ENGINEERING SCIENCE, 2008, 63 (07) : 1914 - 1928
[20] Experimental study of flow pattern and heat transfer associated with a bubble sliding on downward facing inclined surfaces
Qiu, D
Dhir, VK
[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2002, 26 (6-7) : 605 - 616

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