Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

Won Gi Ahn; Si Hyung Lee; Jaewook Nam; See Jo Kim; Kwan Young Lee; Hyun Wook Jung

doi:10.1007/s11998-018-0059-2

Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

Won Gi Ahn, Si Hyung Lee, Jaewook Nam, See Jo Kim, Kwan Young Lee, Hyun Wook Jung

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.

Original language	English
Pages (from-to)	1067-1076
Number of pages	10
Journal	Journal of Coatings Technology and Research
Volume	15
Issue number	5
DOIs	https://doi.org/10.1007/s11998-018-0059-2
Publication status	Published - 2018 Sept 1

Bibliographical note

Funding Information:
Acknowledgments This work was supported by the National Research Foundation of Korean (NRF) grant funded by the Korean government (MSIP) (NRF-2016R1A5A1009592) and the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No.10067706).

Keywords

Dynamic contact angle
Operability window
Slot coating
Static contact angle
Upstream meniscus

ASJC Scopus subject areas

General Chemistry
Surfaces and Interfaces
Surfaces, Coatings and Films
Colloid and Surface Chemistry

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10.1007/s11998-018-0059-2

Cite this

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title = "Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows",

abstract = "The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.",

keywords = "Dynamic contact angle, Operability window, Slot coating, Static contact angle, Upstream meniscus",

author = "Ahn, {Won Gi} and Lee, {Si Hyung} and Jaewook Nam and Kim, {See Jo} and Lee, {Kwan Young} and Jung, {Hyun Wook}",

note = "Funding Information: Acknowledgments This work was supported by the National Research Foundation of Korean (NRF) grant funded by the Korean government (MSIP) (NRF-2016R1A5A1009592) and the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No.10067706).",

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doi = "10.1007/s11998-018-0059-2",

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T1 - Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

AU - Ahn, Won Gi

AU - Lee, Si Hyung

AU - Nam, Jaewook

AU - Kim, See Jo

AU - Lee, Kwan Young

AU - Jung, Hyun Wook

N1 - Funding Information: Acknowledgments This work was supported by the National Research Foundation of Korean (NRF) grant funded by the Korean government (MSIP) (NRF-2016R1A5A1009592) and the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No.10067706).

PY - 2018/9/1

Y1 - 2018/9/1

N2 - The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.

AB - The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.

KW - Dynamic contact angle

KW - Operability window

KW - Slot coating

KW - Static contact angle

KW - Upstream meniscus

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Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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