Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer

NUMERICAL INVESTIGATION OF STABILITY AND EVOLUTION OF AN EVAPORATING LIQUID FILM ON A HEATED STRUCTURED WALL

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

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.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH