TY - GEN
T1 - Dynamics and conformation of single polymer chain in a slot coating flow
AU - Lee, Jeong Yong
AU - Ryu, Bo Kyung
AU - Lee, Joo Sung
AU - Jung, Hyun Wook
AU - Hyun, Jae Chun
PY - 2008
Y1 - 2008
N2 - To guarantee good mechanical and optical properties of coating products, it is important to control molecular orientation of polymer chains in liquids to be coated on the web or substrate. In this study, Brownian dynamics (BD) and the conventional computational flow dynamics (CFD) simulations have been incorporated to elucidate dynamics and conformation of a polymer molecule in coating flow regime. Flexible polymer chain, e.g., λ-DNA molecule here, changes its conformation, relying on its flow strength (Weissenberg number, Wi) and flow type parameter (α). Interestingly, in slot coating flow, the chain can be more extended by the extension-like flow field near the downstream free surface curvature. Due to the complex flow field within the slot coating bead region, the extensibility of polymer chain moving along the streamline has also been investigated by correlating with the effective Wieff and process conditions such as coating gap, web speed, and so on.
AB - To guarantee good mechanical and optical properties of coating products, it is important to control molecular orientation of polymer chains in liquids to be coated on the web or substrate. In this study, Brownian dynamics (BD) and the conventional computational flow dynamics (CFD) simulations have been incorporated to elucidate dynamics and conformation of a polymer molecule in coating flow regime. Flexible polymer chain, e.g., λ-DNA molecule here, changes its conformation, relying on its flow strength (Weissenberg number, Wi) and flow type parameter (α). Interestingly, in slot coating flow, the chain can be more extended by the extension-like flow field near the downstream free surface curvature. Due to the complex flow field within the slot coating bead region, the extensibility of polymer chain moving along the streamline has also been investigated by correlating with the effective Wieff and process conditions such as coating gap, web speed, and so on.
KW - Coating flows
KW - Conformation
KW - Extension flow
UR - http://www.scopus.com/inward/record.url?scp=51149100560&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51149100560&partnerID=8YFLogxK
U2 - 10.1063/1.2964654
DO - 10.1063/1.2964654
M3 - Conference contribution
AN - SCOPUS:51149100560
SN - 9780735405493
T3 - AIP Conference Proceedings
SP - 255
EP - 257
BT - The XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting
T2 - 15th International Congress on Rheology
Y2 - 3 August 2008 through 8 August 2008
ER -