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Numerical Investigation of Stability and Evolution of an Evaporating Liquid Film on a Heated Structured Wall

Bender, Achim and Stephan, Peter and Gambaryan-Roisman, Tatiana (2017):
Numerical Investigation of Stability and Evolution of an Evaporating Liquid Film on a Heated Structured Wall.
Napoli (Italy), May 28-June 1, 2017, DOI: 10.1615/ICHMT.2017.CHT-7.810,
[Conference or Workshop Item]

Abstract

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.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Bender, Achim and Stephan, Peter and Gambaryan-Roisman, Tatiana
Title: Numerical Investigation of Stability and Evolution of an Evaporating Liquid Film on a Heated Structured Wall
Language: English
Abstract:

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.

Journal or Publication Title: Proceedings of CHT-17 ICHMT International Symposium on Advances in Computational Heat Transfer May 28-June 1, 2017, Napoli, Italy
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Event Location: Napoli (Italy)
Event Dates: May 28-June 1, 2017
Date Deposited: 17 Aug 2018 12:43
DOI: 10.1615/ICHMT.2017.CHT-7.810
Official URL: http://dx.doi.org/10.1615/ICHMT.2017.CHT-7.810
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