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Workshop meeting Lorentz Center Contact Line Instabilities

Hein Castelijns, Alexander Zdravkov ASML. Workshop meeting Lorentz Center Contact Line Instabilities. Influence of surface tension gradients: thermal gradient and surfactants. Participants. Hein Castelijns Alexander Zdravkov Chuangxin Zhao Mariano Galvagno Michael Köpf Marco Baragona

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Workshop meeting Lorentz Center Contact Line Instabilities

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

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

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

  4. Subject 2: Laurent Limat “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

  5. Subject 3: ASML 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? Qvapor movie Droplet size ~ 3 mm, initi ~ 4°, end ~ 15°, velocity ~ 5 mm/s

  6. Subject 3: ASML 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

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