Spin-affected droplet coalescence and separation undergoing off-center collision

Chengming He; Jun Hu; Lianjie Yue; Peng Zhang

doi:10.2218/iclass.2021.5945

Spin-affected droplet coalescence and separation undergoing off-center collision

Chengming He, Jun Hu, Lianjie Yue, Peng Zhang^*

^*Corresponding author for this work

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

A recent study (Phys. Review Fluids 5, 113601, 2020) has demonstrated the importance of initial droplet spin on their bouncing, coalescence, and separation for a specific case upon head-on collision. In this paper, a computational study by using the Volume-of-Fluid (VOF) method was performed to investigate the spin-affected coalescence-separation transition for more practical situations of off-center collision. First, a parametric study on droplet separation modes with varying spinning speed (ω₀) and impact parameter (B) was analysed, showing that droplet spin influences reflexive and stretching separations with different mechanisms. Second, the influence of spin chirality on coalescence-separation boundary transition was studied. A prominent finding is that the spin angular momentum of the merged droplet accounts for the droplet separation, in which increasing spin angular momentum by a droplet spin suppress reflective separation while promote stretching separation, and decreasing spin angular momentum by a opposite droplet spin negligibly influence reflexive separation while suppress stretching separation. © 2021 ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems. All Rights Reserved.

Original language	English
Title of host publication	ICLASS Edinburgh 2021
Publisher	ILASS - Europe, Institute for Liquid Atomization and Spray Systems
DOIs	https://doi.org/10.2218/iclass.2021.5945
Publication status	Published - 2021
Externally published	Yes
Event	15th International Conference on Liquid Atomization and Spray Systems (ICLASS 2021) - University of Edinburgh, Edinburgh, United Kingdom Duration: 29 Aug 2021 → 2 Sept 2021 https://ilasseurope.org/events/iclass-2021-proceedings/

Publication series

Name	ICLASS Edinburgh
Number	1
Volume	1

Conference

Conference	15th International Conference on Liquid Atomization and Spray Systems (ICLASS 2021)
Country/Territory	United Kingdom
City	Edinburgh
Period	29/08/21 → 2/09/21
Internet address	https://ilasseurope.org/events/iclass-2021-proceedings/

Funding

This work was supported by the China Postdoctoral Science Foundation (2020M680690), by Hong Kong RGC/GRF (through Grant No. PolyU 152188/20E) and by the Hong Kong Polytechnic University DGRF (through Grants No. G-UAHP)

Research Keywords

Droplet spin
Ligament breakup
Separation
Spin chirality
VOF simulation

Access Output

10.2218/iclass.2021.5945

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@inproceedings{23a694efca5b4ed58577a8125e82573d,

title = "Spin-affected droplet coalescence and separation undergoing off-center collision",

abstract = "A recent study (Phys. Review Fluids 5, 113601, 2020) has demonstrated the importance of initial droplet spin on their bouncing, coalescence, and separation for a specific case upon head-on collision. In this paper, a computational study by using the Volume-of-Fluid (VOF) method was performed to investigate the spin-affected coalescence-separation transition for more practical situations of off-center collision. First, a parametric study on droplet separation modes with varying spinning speed (ω0) and impact parameter (B) was analysed, showing that droplet spin influences reflexive and stretching separations with different mechanisms. Second, the influence of spin chirality on coalescence-separation boundary transition was studied. A prominent finding is that the spin angular momentum of the merged droplet accounts for the droplet separation, in which increasing spin angular momentum by a droplet spin suppress reflective separation while promote stretching separation, and decreasing spin angular momentum by a opposite droplet spin negligibly influence reflexive separation while suppress stretching separation. {\textcopyright} 2021 ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems. All Rights Reserved.",

keywords = "Droplet spin, Ligament breakup, Separation, Spin chirality, VOF simulation",

author = "Chengming He and Jun Hu and Lianjie Yue and Peng Zhang",

year = "2021",

doi = "10.2218/iclass.2021.5945",

language = "English",

series = "ICLASS Edinburgh",

publisher = "ILASS - Europe, Institute for Liquid Atomization and Spray Systems",

number = "1",

booktitle = "ICLASS Edinburgh 2021",

note = "15th International Conference on Liquid Atomization and Spray Systems (ICLASS 2021) ; Conference date: 29-08-2021 Through 02-09-2021",

url = "https://ilasseurope.org/events/iclass-2021-proceedings/",

}

He, C, Hu, J, Yue, L & Zhang, P 2021, Spin-affected droplet coalescence and separation undergoing off-center collision. in ICLASS Edinburgh 2021., 205, ICLASS Edinburgh, no. 1, vol. 1, ILASS - Europe, Institute for Liquid Atomization and Spray Systems, 15th International Conference on Liquid Atomization and Spray Systems (ICLASS 2021), Edinburgh, United Kingdom, 29/08/21. https://doi.org/10.2218/iclass.2021.5945

Spin-affected droplet coalescence and separation undergoing off-center collision. / He, Chengming; Hu, Jun; Yue, Lianjie et al.
ICLASS Edinburgh 2021. ILASS - Europe, Institute for Liquid Atomization and Spray Systems, 2021. 205 (ICLASS Edinburgh; Vol. 1, No. 1).

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - Spin-affected droplet coalescence and separation undergoing off-center collision

AU - He, Chengming

AU - Hu, Jun

AU - Yue, Lianjie

AU - Zhang, Peng

PY - 2021

Y1 - 2021

N2 - A recent study (Phys. Review Fluids 5, 113601, 2020) has demonstrated the importance of initial droplet spin on their bouncing, coalescence, and separation for a specific case upon head-on collision. In this paper, a computational study by using the Volume-of-Fluid (VOF) method was performed to investigate the spin-affected coalescence-separation transition for more practical situations of off-center collision. First, a parametric study on droplet separation modes with varying spinning speed (ω0) and impact parameter (B) was analysed, showing that droplet spin influences reflexive and stretching separations with different mechanisms. Second, the influence of spin chirality on coalescence-separation boundary transition was studied. A prominent finding is that the spin angular momentum of the merged droplet accounts for the droplet separation, in which increasing spin angular momentum by a droplet spin suppress reflective separation while promote stretching separation, and decreasing spin angular momentum by a opposite droplet spin negligibly influence reflexive separation while suppress stretching separation. © 2021 ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems. All Rights Reserved.

AB - A recent study (Phys. Review Fluids 5, 113601, 2020) has demonstrated the importance of initial droplet spin on their bouncing, coalescence, and separation for a specific case upon head-on collision. In this paper, a computational study by using the Volume-of-Fluid (VOF) method was performed to investigate the spin-affected coalescence-separation transition for more practical situations of off-center collision. First, a parametric study on droplet separation modes with varying spinning speed (ω0) and impact parameter (B) was analysed, showing that droplet spin influences reflexive and stretching separations with different mechanisms. Second, the influence of spin chirality on coalescence-separation boundary transition was studied. A prominent finding is that the spin angular momentum of the merged droplet accounts for the droplet separation, in which increasing spin angular momentum by a droplet spin suppress reflective separation while promote stretching separation, and decreasing spin angular momentum by a opposite droplet spin negligibly influence reflexive separation while suppress stretching separation. © 2021 ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems. All Rights Reserved.

KW - Droplet spin

KW - Ligament breakup

KW - Separation

KW - Spin chirality

KW - VOF simulation

UR - http://www.scopus.com/inward/record.url?scp=85180790286&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85180790286&origin=recordpage

U2 - 10.2218/iclass.2021.5945

DO - 10.2218/iclass.2021.5945

M3 - RGC 32 - Refereed conference paper (with host publication)

T3 - ICLASS Edinburgh

BT - ICLASS Edinburgh 2021

PB - ILASS - Europe, Institute for Liquid Atomization and Spray Systems

T2 - 15th International Conference on Liquid Atomization and Spray Systems (ICLASS 2021)

Y2 - 29 August 2021 through 2 September 2021

ER -

Spin-affected droplet coalescence and separation undergoing off-center collision

Abstract

Publication series

Conference

Funding

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this