Topic
Mass transfer coefficient
About: Mass transfer coefficient is a research topic. Over the lifetime, 7827 publications have been published within this topic receiving 168354 citations.
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TL;DR: In this article, gas holdup, bubble behavior, interfacial area and gas-liquid mass transfer in a 5m internal-loop air-lift reactor with non-Newtonian fluid were studied in the superficial gas velocity (Ug) range of 2-12 cm/s.
68 citations
TL;DR: In this article, a rate-based algorithm was used to yield a predictive tool for MDEA gas scrubbing processes, assuming that thermodynamic equilibrium exists only at the gas-liquid interphase, but not in the boundary layers, where temperature and concentration gradients are present.
Abstract: A rate-based algorithm was used to yield a predictive tool for MDEA gas scrubbing processes. The model adopts the two-film theory, assuming that thermodynamic equilibrium exists only at the gas–liquid interphase, but not in the boundary layers, where temperature and concentration gradients are present. Correspondingly chemical equilibrium among the reacting species in the liquid phase is assumed for the bulk phase, but not for the liquid boundary layer. Mass transfer is modelled using calculated mass transfer coefficients in combination with an enhancement model to account for the chemical reactions. Correlations for geometric data, like hold-up and interfacial area, and for reaction rates are provided to give reliable results. The latter correlations are also used to describe the desorption process, which is calculated with an equilibrium approach, considering the kinetics of CO 2 desorption. The so obtained tool is tested against measurements done recently by Lurgi GmbH at a commercially operated selective MDEA plant in Germany. A closed absorption and desorption loop was build up using Aspen RATEFRAC™, capable of modelling the whole process with all necessary equipment.
68 citations
TL;DR: In this paper, a simplified method is presented for estimating the film mass transfer and the surface diffusion coefficients from batch adsorption kinetic data without solving partial differential equations, which shows a reasonable agreement with the experimental kinetics.
67 citations
TL;DR: In this paper, a new method called hD-Le separative evaluation method was developed for determining coupled heat and mass transfer coefficients between air and liquid desiccant, through which the heat and Mass Transfer Coefficients (MTC) were calculated to obtain from experimental inlet and outlet parameters of air and Desiccant solution.
67 citations
TL;DR: In this paper, the effect of employing sonication on the diffusion of sodium salt (NaCl) and a salt replacer (SR) into pork meat was investigated and the mass transfer equation was solved using the Runge-Kutta method.
Abstract: Summary
In an attempt to reduce the high intake of dietary salt, the processed meat industry is continuously looking for alternative solutions for salt replacement. The objective of this study was to investigate the effect of employing sonication on the diffusion of sodium salt (NaCl) and a salt replacer (SR) into pork meat. Ultrasound-assisted brining experiments were carried out using 5% NaCl or SR at power levels of 9.0 and 54.9 W cm−2 for 120 min. Samples were assessed for cooking loss, water mobility, deformation, while thermal behaviour was analysed using differential scanning calorimetry (DSC). Experimental data obtained were used to estimate the mass transfer coefficient of the brining process. The mass transfer equation was solved using the Runge–Kutta method. Results showed that the ultrasonic treatment had a low influence on the mass transfer of salt into pork samples. Only at high ultrasonic power was the mass transfer coefficient higher than the static brining. This study has improved our understanding of the effect of sonication on diffusion of NaCl and SR in pork meat and will enable a more systemic approach to future healthy meat product development.
67 citations