Presentation on theme: "Workshop 1 (Room 331, Gratama): Contactline at micron and submicron scale and air entrainment: unresolved issues Mark Franken Muhammad Akram Reza Olesya."— Presentation transcript:
Workshop 1 (Room 331, Gratama): Contactline at micron and submicron scale and air entrainment: unresolved issues Mark Franken Muhammad Akram Reza Olesya Bliznyuk Pechun Tsai Sandra van der Graaf Sedat Tokgo Tak Shing Chang Yves Pommeau Dieter ‘t Mannetje Frits Dijksman Hanneke Gelderblom Jacco Snoeijer James Seddon Jens Eggers Jens Hartig Koen Winkels Facilitators: Jaap den Toonder, Ramin Badie
Workshop 2 (Room 201): Inkjet Printing Alvaro G. Marin Arjan van der Bos Charlotte Kjellander David Seveno Detlef Lohse O. Vinogradova Roger Jeurissen Facilitators: Hans Reinten, Herman Wijshoff S. Chibbaro Theo Driessen V. Ajaev
Workshop 3 (room 363): Surface tension gradients Facilitators: Alexander Zdravkov, Hein Castelijns Chuangxin Zhao Marco Baragona Mariano Galvagno Michael Kopf Sebastiaan Schmieschek
Workshop 4 (room 355): Thin layer breakup: prediction in mesoscopic domain Facilitators: Michel Riepen, Christian Berendsen Anton Darhuber Berend Brasjen Hyungsoo Kim Jos Zeegers Jung Min Oh Maosheng Ren Marleen van Aartrijk
Workshop 1 (Room 331, Gratama): Contactline at micron and submicron scale and air entrainment: unresolved issues
Length and Time Scales At air entrainment during plunging of a plate in liquid bath contactline is no longer straight but zigzag Entrainment of air at different length scales Deposition speed of fluid vs. nanobubbles number density Nanobubbles on photoresist Multiscale and more on different length scales Contactline dissipation at submicron scales Real contact angle vs. apparent contact angle Capillary waves on interfaces and contactline Bubble formation upon impact of micron size drops on meniscus Nucleation of films below transition (during withdrawing a plate from the bath)
Geometry/Shape How does the shape of two drop surfaces change at the time of collision? What about the shape of the meniscus during drop impact and at different speeds?
Surface Properties Air entrainment for sliding drops on superhydrophobic surfaces and at different Reynolds number Roughness: transition to Cassie-Baxter under movement Hysteresis still not clarified well: not being able to predict based on first principles Model for effect of random roughness Contactline running over structures and air entrainment coupling between defects and dynamics Surface topography Air entrainment at pinning
Liquid properties High index fluids Heating effects due to dissipation Coalescence and collision of two types of miscible fluids
External forces Hysteresis under ultrasound field (4X) What is the effect of shaking Electrostatic forces and contactline dynamics
Non-coalescence; non-entrainment Many experiments drops bounce on an oil bath when the bath is shaken (Couder); not understood why it only works for certain fluids Dependence of entrainment on molecular weight of the gas; pressure forces?
Others What is the effect of precursor film: speed and entrainment Why are nanobubbles stable Why are nanobubbles formed Wave break-up (into tiny drops); effect of capillarity More equations on moving contactline: beyond lubrication approximation