Christiane Schlawitschek's research while affiliated with Technische Universität Darmstadt and other places
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Publications (5)
In this study, hydrodynamics and heat transport during the impact of single and multiple drops onto a hot wall are studied numerically. The heat transfer in the vicinity of the three-phase contact line, where solid, liquid and vapour meet, contributes significantly to the global heat transfer. The microscale processes in the region of the three-pha...
The present work addresses the influence of the wall superheat, drop impact velocity, and impact diameter on hydrodynamics, heat transport, and evaporation during drop impingement onto a heated solid wall in a pure vapor atmosphere. A generic experimental setup has been designed and built with a temperature-controlled cell that allows investigation...
A numerical method based on the Volume-of-Fluid approach has been used for simulating the simultaneous collision of two drops with a solid substrate. Heat transfer in the substrate and in the drop have been evaluated during the drop spreading and receding phases. The numerical model includes the liquid evaporation from the drop surface and especial...
We study the role of solid-liquid interface thermal resistance (Kapitza resistance) on the evaporation rate of droplets on a heated surface by using a multi-scale combination of molecular dynamics (MD) simulations and analytical continuum theory. We parameterize the nonbonded interaction potential between perfluorohexane (C6F14 ) and a face-centere...
Electrocoalescence of aqueous droplets in oil emulsions is commonly contemplated for enhancing separation. High voltage electric fields can induce charges to drops evoking merging of adjacent droplets. The newly formed larger drops then sink faster in gravitational common settlers. Therefore, separation performance of an electrostatic coalescer is...
Citations
... Especially for very thin solid substrates having low total heat capacity, as well as for solid substrates with low thermal effusivity the sudden temperature drop is very pronounced (strong pre-cooling) [13,14]. Strong pre-cooling results in lower heat transfer for the second drop impact compared to the initial drop impact, since the driving temperature difference is reduced [13,14,17]. However, in the case of thicker substrates, where low pre-cooling is observed, heat transfer is higher for the second drop impact compared to the initial drop impact [14,[17][18][19]. ...
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... A few recent studies 2,21-25 have specifically investigated the heat transfer during a drop impact on SHP surfaces. The heat transfer analysis presented therein utilized infrared (IR) imaging, however, often relied on measuring droplet surface temperature, 25,26 assumed uniform temperature into the substrate, 22 or the surface temperature after the droplet has left the surface. 2 Recently, some studies [29][30][31][32][33] have reported a detailed methodology to interpret the solid-liquid interface temperature using IR imaging. ...
... The theoretical predictions based on the similarity solution for the heat flux (Roisman, 2010b) agree very well with direct numerical computations of heat transfer in a spreading drop (Berberović et al., 2011;Schremb et al., 2017;Batzdorf et al., 2017). ...
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... The Kapitza resistance at solid-fluid interfaces of many material pairings has been studied by NEMD simulations [12][13][14][15] , often with water as fluid component [16][17][18] . Besides the variation of the material pairings, the influence of single simulation parameters like the channel width 19,20 , the surface geometry 13,21 , the temperature or the thermostating 17,[22][23][24] , the fluid density 25,26 , and the solid-fluid 4,9,10,18,[27][28][29] as well as the solid-solid interaction 3,6,30,31 were determined by MD simulations. ...
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... Electrostatic fields applied in the electrocoalescence are presented in three different forms. These forces are alternating current (AC) (Lesaint et al., 2009;Suemar et al.), direct current (DC) (Wallau et al., 2016), and pulsed DC (Zhang et al., 2012). AC field is the most common and oldest electric field and can be utilized in a broad range of crude oil emulsions. ...
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