Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies



+44 (0)20 7594 1601c.markides Website




404ACE ExtensionSouth Kensington Campus






BibTex format

author = {Denner, F and Charogiannis, A and Pradas, M and Markides, C and van, Wachem B and Kalliadasis, S},
doi = {10.1017/jfm.2017.867},
journal = {Journal of Fluid Mechanics},
pages = {491--519},
title = {Solitary waves on falling liquid films in the inertia-dominated regime},
url = {},
volume = {837},
year = {2018}

RIS format (EndNote, RefMan)

AB - We offer new insights and results on the hydrodynamics of solitary waves on inertiadominatedfalling liquid films using a combination of experimental measurements,direct numerical simulations (DNS) and low-dimensional (LD) modelling. The DNSare shown to be in very good agreement with experimental measurements in termsof the main wave characteristics and velocity profiles over the entire range ofinvestigated Reynolds numbers. And, surprisingly, the LD model is found to predictaccurately the film height even for inertia-dominated films with high Reynoldsnumbers. Based on a detailed analysis of the flow field within the liquid film, thehydrodynamic mechanism responsible for a constant, or even reducing, maximumfilm height when the Reynolds number increases above a critical value is identified,and reasons why no flow reversal is observed underneath the wave trough above acritical Reynolds number are proposed. The saturation of the maximum film heightis shown to be linked to a reduced effective inertia acting on the solitary waves asa result of flow recirculation in the main wave hump and in the moving frame ofreference. Nevertheless, the velocity profile at the crest of the solitary waves remainsparabolic and self-similar even after the onset of flow recirculation. The upper limitof the Reynolds number with respect to flow reversal is primarily the result ofsteeper solitary waves at high Reynolds numbers, which leads to larger streamwisepressure gradients that counter flow reversal. Our results should be of interest in theoptimisation of the heat and mass transport characteristics of falling liquid films andcan also serve as a benchmark for future model development.
AU - Denner,F
AU - Charogiannis,A
AU - Pradas,M
AU - Markides,C
AU - van,Wachem B
AU - Kalliadasis,S
DO - 10.1017/jfm.2017.867
EP - 519
PY - 2018///
SN - 0022-1120
SP - 491
TI - Solitary waves on falling liquid films in the inertia-dominated regime
T2 - Journal of Fluid Mechanics
UR -
UR -
VL - 837
ER -