Wetting, flow & pH

This project studies molecular processes in dynamic wetting, including how they affect larger scales and interface with continuum models. Although wetting is a phenomenon that can be observed by eye at the macroscale, processes at the molecular scale can play an important role, especially at the three-phase contact line, where solid, liquid and gas meet. Here displacements of small groups of molecules determine how fast the contact line, and thereby the wetting advances. Molecular dynamics is a powerful tool to study these processes. Information obtained at the molecular scale can then transferred to model at larger scale in a multi-scale modeling framework. Current work projects concern fundamentals of contact line motion of water on hydrophilic substrates, electrowetting and wetting on rough surfaces.

There is an opening for a PhD-student on assembly of biomolecules using pH in flow.

Contributors:

Recent Publications:

  • Lācis, U., Pellegrino, M., Sundin, J., Amberg, G., Zaleski, S., Hess, B. and Bagheri, S., Nanoscale sheared droplet: Volume-of-Fluid, phase-field and no-slip molecular dynamics, preprint: arXiv:2112.09682v1
  • Lācis, U., Johansson, P., Fullana, T., Hess, B., Amberg, G., Bagheri, S. and Zalenski, S., Steady moving contact line of water over a no-slip substrate, The European Physical Journal Special Topics, vol. 229, 1897–1921 (2020). doi:https://doi.org/10.1140/epjst/e2020-900280-9
  • Johansson, P. and Hess, B., Electrowetting diminishes contact line friction in molecular wetting, Physical Review Fluids (2020), 5, 064203. doi:10.1103/PhysRevFluids.5.064203
  • Johansson, P. and Hess, B., Molecular origin of contact line friction in dynamic wetting, Physical Review Fluids (2018), 3, 074201. doi:10.1103/PhysRevFluids.3.074201
  • Johansson, P., Carlson, A. and Hess, B., Water–substrate physico-chemistry in wetting dynamics, Journal of Fluid Mechanics (2015), 781, 695-711. doi:10.1017/jfm.2015.517