Local microbubble concentration by defocused volumetric shadowgraphy with a single camera

Wout Cornel; Jerry Westerweel; Christian Poelma

doi:10.3929/ethz-b-000279233

Local microbubble concentration by defocused volumetric shadowgraphy with a single camera

Wout Cornel, Jerry Westerweel, Christian Poelma

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

The challenge presented in this research is to determine the local volumetric bubble concentration (or void fraction) in the center of a microbubble cloud with limited optical access and without disturbing the flow. By applying defocused volumetric shadowgraphy to an aerated water column we were able to measure the characteristics of single microbubbles in the control volume for a void fraction of 0.078 percent. The time-averaged local bubble concentration in the center of the water column was measured over four periods (800 seconds each) to investigate the repeatability. Two reference methods, based on differential pressure (ΦV = 0.081 percent ± 0.011) and direct observation of the bubble's in-depth z-position, both validate the results independently.

Original language	English
Title of host publication	Proceedings 18th International Symposium on Flow Visualization
Editors	Thomas Rösgen
Place of Publication	Zürich, Switzerland
Publisher	ETH Zürich
Number of pages	11
DOIs	https://doi.org/10.3929/ethz-b-000279233
Publication status	Published - 2018
Event	ISFV18: 18th International Symposium on Flow Visualization - Zürich, Switzerland Duration: 26 Jun 2018 → 29 Jun 2018 Conference number: 18 http://www.isfv18.ethz.ch/

Conference

Conference	ISFV18: 18th International Symposium on Flow Visualization
Abbreviated title	ISFV18
Country/Territory	Switzerland
City	Zürich
Period	26/06/18 → 29/06/18
Internet address	http://www.isfv18.ethz.ch/

Keywords

local bubble concentration
defocused volumetric shadowgraphy
microbubbles
two-phase
flow induced by rising gas bubbles
defocused shadowgraphy imaging
local void fraction
single camera
imaging

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10.3929/ethz-b-000279233

Paper 164a-2Final published version, 2.29 MBLicence: Other

Cite this

@inproceedings{53eecccc14934344a05a99b3dc5f1daa,

title = "Local microbubble concentration by defocused volumetric shadowgraphy with a single camera",

abstract = "The challenge presented in this research is to determine the local volumetric bubble concentration (or void fraction) in the center of a microbubble cloud with limited optical access and without disturbing the flow. By applying defocused volumetric shadowgraphy to an aerated water column we were able to measure the characteristics of single microbubbles in the control volume for a void fraction of 0.078 percent. The time-averaged local bubble concentration in the center of the water column was measured over four periods (800 seconds each) to investigate the repeatability. Two reference methods, based on differential pressure (ΦV = 0.081 percent ± 0.011) and direct observation of the bubble's in-depth z-position, both validate the results independently.",

keywords = "local bubble concentration, defocused volumetric shadowgraphy, microbubbles, two-phase, flow induced by rising gas bubbles, defocused shadowgraphy imaging, local void fraction, single camera, imaging",

author = "Wout Cornel and Jerry Westerweel and Christian Poelma",

year = "2018",

doi = "10.3929/ethz-b-000279233",

language = "English",

editor = "Thomas R{\"o}sgen",

booktitle = "Proceedings 18th International Symposium on Flow Visualization",

publisher = "ETH Z{\"u}rich",

note = "ISFV18: 18th International Symposium on Flow Visualization, ISFV18 ; Conference date: 26-06-2018 Through 29-06-2018",

url = "http://www.isfv18.ethz.ch/",

}

Cornel, W , Westerweel, J & Poelma, C 2018, Local microbubble concentration by defocused volumetric shadowgraphy with a single camera. in T Rösgen (ed.), Proceedings 18th International Symposium on Flow Visualization. ETH Zürich, Zürich, Switzerland, ISFV18: 18th International Symposium on Flow Visualization, Zürich, Switzerland, 26/06/18. https://doi.org/10.3929/ethz-b-000279233

Local microbubble concentration by defocused volumetric shadowgraphy with a single camera. / Cornel, Wout ; Westerweel, Jerry ; Poelma, Christian.
Proceedings 18th International Symposium on Flow Visualization. ed. / Thomas Rösgen. Zürich, Switzerland: ETH Zürich, 2018.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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T1 - Local microbubble concentration by defocused volumetric shadowgraphy with a single camera

AU - Cornel, Wout

AU - Westerweel, Jerry

AU - Poelma, Christian

N1 - Conference code: 18

PY - 2018

Y1 - 2018

N2 - The challenge presented in this research is to determine the local volumetric bubble concentration (or void fraction) in the center of a microbubble cloud with limited optical access and without disturbing the flow. By applying defocused volumetric shadowgraphy to an aerated water column we were able to measure the characteristics of single microbubbles in the control volume for a void fraction of 0.078 percent. The time-averaged local bubble concentration in the center of the water column was measured over four periods (800 seconds each) to investigate the repeatability. Two reference methods, based on differential pressure (ΦV = 0.081 percent ± 0.011) and direct observation of the bubble's in-depth z-position, both validate the results independently.

AB - The challenge presented in this research is to determine the local volumetric bubble concentration (or void fraction) in the center of a microbubble cloud with limited optical access and without disturbing the flow. By applying defocused volumetric shadowgraphy to an aerated water column we were able to measure the characteristics of single microbubbles in the control volume for a void fraction of 0.078 percent. The time-averaged local bubble concentration in the center of the water column was measured over four periods (800 seconds each) to investigate the repeatability. Two reference methods, based on differential pressure (ΦV = 0.081 percent ± 0.011) and direct observation of the bubble's in-depth z-position, both validate the results independently.

KW - local bubble concentration

KW - defocused volumetric shadowgraphy

KW - microbubbles

KW - two-phase

KW - flow induced by rising gas bubbles

KW - defocused shadowgraphy imaging

KW - local void fraction

KW - single camera

KW - imaging

U2 - 10.3929/ethz-b-000279233

DO - 10.3929/ethz-b-000279233

M3 - Conference contribution

BT - Proceedings 18th International Symposium on Flow Visualization

A2 - Rösgen, Thomas

PB - ETH Zürich

CY - Zürich, Switzerland

T2 - ISFV18: 18th International Symposium on Flow Visualization

Y2 - 26 June 2018 through 29 June 2018

ER -

Local microbubble concentration by defocused volumetric shadowgraphy with a single camera

Abstract

Conference

Keywords

Access to Document

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Cite this