Browsing by Author "Gonzalez, Eduardo"

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    Barred-beach morphological control on infragravity motion
    (2012) Almar, R.; Cienfuegos Carrasco, Rodrigo Alberto; Gonzalez, Eduardo; Catalán, P.; Michallet, H.; Bonneton, P.; Castelle, B.; Suarez, L.
    A conceptual analysis of the coupling between bars and infragravity waves is performed combining laboratory experiments and numerical modeling. Experiments are carried out in a wave flume with a barred profile. The Boussinesq fully-nonlinear model SERR1D is validated with the laboratory data and a sensitivity analysis is performed next to study the influence on the infragravity wave dynamics of bar amplitude and location, and swash zone slope. A novel technique of incident and reflected motions separation that conserves temporal characteristics is applied. We observe that changing bar characteristics induces substantial variations in trapped energy. Interestingly, a modification of swash zone slope has a large influence on the reflected component, controlling amplitude and phase time-lag, and consequently on the resonant pattern. Variations of trapped infragravity energy induced by changes of swash zone slope reach 25 %. These changes in infragravity pattern consequently affect short-wave dynamics by modifying the breakpoint location and the breaking intensity. Our conceptual investigation suggests the existence of a morphological feedback through the action of evolving morphology on infragravity structures which modulates the action of short-waves on the morphology itself.
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    Solubility and Thermodynamic Parameters of H2S/CH4 in Ionic Liquids Determined by 1H NMR
    (2024) Zarraga, Jeannette; Zapata, Mariana; Ibarra, Darmenia; Duarte, Darlin; Morillo, Angel; Llovera, Ligia; Gonzalez, Eduardo; Ferrer, Victor; Chirinos, Juan
    Natural gas remains an important global source of energy. Usually, sour gas from the well or refinery stream contains H2S among other contaminants that should be removed to fulfill permissible standards of use. Despite the use of different gas-liquid sour gas upgrading technologies, ionic liquids (ILs) have been recognized as promising materials to remove H2S from sour gas. However, data concerned with thermodynamic solution functions of H2S in ILs have scarcely been reported in the literature. In this work, solution H-1 NMR spectroscopy was employed for quantifying H2S soluble in [BMIM][Cl] and for gaining a better understanding of the H2S-IL interaction. Experiments were carried out in a Young-Tap NMR tube containing a saturated solution of H2S/CH4/[BMIM][Cl] and recording spectra from 298 to 333 K. The thermodynamic solution functions, determined from the Van't Hoff equation, showed that solubility of the H2S in the [BMIM][Cl] is an exothermic gas-liquid physisorption process (Delta H-sol degrees = -66.13 kJmol(-1)) with a negative entropy change (Delta S-sol degrees = -168.19 JK(-1) mol(-1)). H-1 NMR spectra of the H2S/[BMIM][Cl] solution show a feature of strong solute-solvent interactions. However, solubility enthalpy is a fifth of the H-S bond energy value. Results from H-1 NMR spectroscopy also agree with those from the bench dynamic experiments.