Workshop meeting Lorentz Center Contact Line Instabilities Influence of surface tension gradients: thermal gradient and surfactants Hein Castelijns, Alexander.

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Workshop meeting Lorentz Center Contact Line Instabilities Influence of surface tension gradients: thermal gradient and surfactants Hein Castelijns, Alexander Zdravkov ASML

Slide 2 | Participants Hein Castelijns Alexander Zdravkov Chuangxin Zhao Mariano Galvagno Michael Köpf Marco Baragona Uwe Thiele Laurent Limat

Slide 3 | Subject 1: Liquid metal (weld pool) Inward Marangoni flow  air entrainment in weld Forward Marangoni flow  instability (fingering) Outcome: suggestions to literature and possibly numerical modelling Chuangxin Zhao

Slide 4 | Subject 2: “Coffee stain” / pattern formation in drying droplets/films  How Marangoni effects come into play? Outcome: References to recent papers, e.g. on coffee stain avoidance by Marangoni flow ASML has interest in drying stain formation Discussion about model applicability Laurent Limat

Slide 5 | Manipulation of droplet on (hydrophilic) surface Questions: How to use  to maximize droplet velocity? What is the effect of the precursor film on this phenomenon? Subject 3: Q vapor movie ASML Droplet size ~ 3 mm,  initi ~ 4°,  end ~ 15°, velocity ~ 5 mm/s

Slide 6 | Manipulation of droplet on (hydrophilic) surface Outcome: discussion about phenomenon and modelling suggestion to look at surfactant systems (self-running droplets) other types of droplet manipulation (vibration etc.) surface structure  slip? localizing  in application Subject 3: ASML

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