Parameters of gas dissolution in liquids obtained by isothermal pressure decay

Abstract

in Wiley InterScience (www.interscience.wiley.com).A rapid and effective data analysis and interpretation approach is developed and validated for simultaneous determination of the film-mass-transfer and diffusion coefficients from time-limited experimental data obtained by dissolving gas in liquids by the pressure-decay method under isothermal conditions. Whereas previous approaches require experimental data until equilibrium and only determine the diffusion coefficient, accurate and rapid estimation of both parameters are achieved using a shorter set of time-limited data, thereby reducing the errors owing to swelling by significant gas dissolution at later times. The equilibrium conditions can be predicted theoretically stemming from an analysis of the time-limited data. This provides the estimates of the equilibrium pressure and gas solubility. This methodology not only yields accurate parameter values, but also alleviates the sufficiently large-time collection of pressuredecay data needed to essentially achieve equilibrium.

Quantification of Density-Driven Natural Convection for Dissolution Mechanism in CO2 Sequestration

“…Other researchers have proposed and developed different mathematical solutions by modeling the interface boundary condition differently. With dependence on how the interface boundary condition is defined, a range of simple to very complex solutions can be expected for this problem Mehrotra 2000, 2002;Civan and Rasmussen 2006;Rasmussen and Civan 2009;Tharanivasan et al 2004;Etminan et al 2010). It is evident that there is not a considerable error in using simple method for determination of diffusion coefficient.…”

Suggesting a numerical pressure-decay method for determining CO2 diffusion coefficient in water

“…Diffusivity can be calculated based on the inverse techniques presented by (I) Zhang et al [39], (II) Sheikha et al [40] and (III) Rasmussen and Civan [42]. These techniques were used before to find diffusivity of gases into liquids, when only diffusion was the dominant mechanism [9,47,66].…”

“…The results (outputs) are in good agreement to the given (input) values. For better comprehension please read the assumptions and derivations of illustrated models in the references [39,40,42].…”

“…According to their assumptions, Henry's law applies for equilibrium conditions at the upper liquid boundary. Rasmussen and Civan [42] developed an approach for simultaneous determination of the film mass transfer and DC from time-limited data. They used a Robin-type boundary condition at the interface which could predict non-equilibrium behavior of dissolution.…”

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

“…The diffusion of carbon dioxide into various fluids [48][49][50][51][52][53][54][55][56][57][58][59][60] and the diffusion of refrigerants into lubricant oils [40,[61][62][63][64] are described in the literature. Despite this effort, the diffusion of carbon dioxide into synthetic oils had yet to be reported.…”