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DOI: 10.1615/ICHMT.2017.CHT-7.810
pages 785-788

Achim Bender
Institute for Technical Thermodynamics, Technische Universitat Darmstadt, Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany

Peter Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Tatiana Gambaryan-Roisman
Institute of Technical Thermodynamics and Center of Smart Interfaces, Technische Universitat Darmstadt, Alarich-Weiss-Str. 10, 64287, Darmstadt, Germany


Thin liquid films evaporating on heated structured surfaces can be found in many industrial applications. and gasoline fuels, for example, are known to form films on the cylinder surface after injection. Deposits, which have a negative effect on the combustion process, can form from those films especially in the vicinity of three-phase contact lines. Thus, it is important to understand the impact of influencing factors on film topology and stability as well as heat and mass transfer to prevent deposit formation. In this work, the effect of evaporation and wall structure on the development of liquid films and the resulting heat and mass transfer is examined. Temperature gradients develop at the liquid-gas interface and lead to Marangoni convection. Film evaporation and the unequal heating of the liquid due to the structured wall have competing effects on the film stability. Long-Wave theory is used to reduce the complexity of the problem. The resulting equation is a fourth order partial differential equation, which is solved numerically using finite differences and a Crank-Nicolson scheme. Grid and time step independence is ensured. The influence of evaporation rate and wall structure on film development and rupture time as well as heat and mass transfer within the film is discussed.

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