Besides the mentioned problems in his doctoral work Manuel's
interest, initiated at ULB, on some rather basic questions of (mostly
non-equilibrium) thermodynamics and statistical physics continued
over decades. We may mention his analysis, several years later, of the
domain of the validity of the so-called Boussinesq (and Overbeck)
hydrodynamic equations of standard use in the literature of hydrodynamic
instabilities. He identified the significant parameters to be used
in the first and succesive approximations. He also studied the general
lay-out of most hydrodynamic instabilities with particular emphasis
on buoyancy-driven (Rayleigh–Benard) instabilities and surfacetension-
gradient-driven (Bénard–Marangoni) instabilities. Another
related problem was the assessment of the validity of John Ross' nonlinear
non-equilibrium thermodynamics. With him he targeted not
only the basic understanding of all transport processes and reactive
systems but also the purely thermodynamic approach to hydrodynamic
instabilities with quite satisfactory experimental verification of predictions.
The same spirit is in the work with Victor Starov when dealing
with wetting and spreading processes and, to a certain extent, in
the work in collaboration with Ramon G. Rubio and colleagues.
Besides the mentioned problems in his doctoral work Manuel's
interest, initiated at ULB, on some rather basic questions of (mostly
non-equilibrium) thermodynamics and statistical physics continued
over decades. We may mention his analysis, several years later, of the
domain of the validity of the so-called Boussinesq (and Overbeck)
hydrodynamic equations of standard use in the literature of hydrodynamic
instabilities. He identified the significant parameters to be used
in the first and succesive approximations. He also studied the general
lay-out of most hydrodynamic instabilities with particular emphasis
on buoyancy-driven (Rayleigh–Benard) instabilities and surfacetension-
gradient-driven (Bénard–Marangoni) instabilities. Another
related problem was the assessment of the validity of John Ross' nonlinear
non-equilibrium thermodynamics. With him he targeted not
only the basic understanding of all transport processes and reactive
systems but also the purely thermodynamic approach to hydrodynamic
instabilities with quite satisfactory experimental verification of predictions.
The same spirit is in the work with Victor Starov when dealing
with wetting and spreading processes and, to a certain extent, in
the work in collaboration with Ramon G. Rubio and colleagues.
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