Below, we focus on
Manuel's contributions to hydrodynamics and, in particular, to interfacial
phenomena in general. In a sequential way let us identify his
research achievements in thermodynamics and statistical mechanics
(basic questions including basic aspects of hydrodynamic instabilities),
about the role of cross-transport processes in various problems,
interfacial instabilities due to surfactants, and surface-tensiongradients
(the Marangoni effect); Bénard convection and derivatives,
patterned convection and the evolution of pattern defects, interfacial
transverse and longitudinal–dilational waves, the onset and growth of
solitary waves and solitons in various systems including interfaces, interfacial
instabilities, and waves excited by parametric excitation-coupled
or not to the Marangoni effect in single and layered structures-, the
self-propulsion or the super-drag of active drops due to instabilities
triggered by the Marangoni effect, the aspects of wetting and spreading
dynamics, and the dynamics of falling liquid films.