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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, an alkaline hydrolysis reaction was used as the model reaction to investigate the performance of liquid-liquid slug flow microchannel, and the specific interfacial area was determined through the photographic snapshot method physically by means of measuring the lengths of relevant slugs.
Abstract: An alkaline hydrolysis reaction was used as the model reaction to investigate the performance of liquid–liquid slug flow microchannel. The specific interfacial area was determined through the photographic snapshot method physically by means of measuring the lengths of relevant slugs. The overall volumetric mass transfer coefficients were calculated through the Danckwerts’ model chemically. The influences of various operating conditions on the slug length, the overall volumetric extraction rate and the mass transfer coefficient were investigated quantitatively. A decreasing trend of volumetric mass transfer coefficients along the channel length was found. The linear dependence of the volumetric extraction rate on the volumetric mass transfer coefficient indicates that the overall rate of the process is determined by the mass transfer process. In addition, the volumetric mass transfer coefficients were correlated for different channel lengths.
72 citations
TL;DR: It was shown that the most critical effect on process performance was the effect of velocity on biofilm structure, and values of the overall mass transfer coefficient of a tracer through the diffusion boundary layer, the biofilm, and the membrane were shown to be identical during different experiments at the maximum biofilm thickness.
Abstract: The effect of liquid flow velocity on biofilm development in a membrane-aerated biofilm reactor was investigated both by mathematical modeling and by experiment, using Vibrio natriegens as a test organism and acetate as carbon substrate. It was shown that velocity influenced mass transfer in the diffusion boundary layer, the biomass detachment rate from the biofilm, and the maximum biofilm thickness attained. Values of the overall mass transfer coefficient of a tracer through the diffusion boundary layer, the biofilm, and the membrane were shown to be identical during different experiments at the maximum biofilm thickness. Comparison of the results with published values of this parameter in membrane attached biofilms showed a similar trend. Therefore, it was postulated that this result might indicate the mechanism that determines the maximum biofilm thickness in membrane attached biofilms. In a series of experiments, where conditions were set so that the active layer of the membrane attached biofilm was located close to the membrane biofilm interface, it was shown that the most critical effect on process performance was the effect of velocity on biofilm structure. Biofilm thickness and effective diffusivity influenced reaction and diffusion in a complex manner such that the yield of biomass on acetate was highly variable. Consideration of endogenous respiration in the mathematical model was validated by direct experimental measurements of yield coefficients. Good agreement between experimental measurements of acetate and oxygen uptake rates and their prediction by the mathematical model was achieved.
71 citations
TL;DR: In this paper, the thickness of the diffusion layer was determined as a function of the volume rate of the gas evolution for both hydrogen and oxygen evolving electrodes in alkaline solution, and it was concluded from the experimental results that the mass transfer can be explained on the basis of the hydrodynamic model when no coalescence of gas bubbles occurs and on that of the penetration model when coalescence occurs frequently.
71 citations
TL;DR: In this article, a detailed mathematical model is developed to optimize the operating conditions of absorption-desorption cycle, which is necessary for carbon dioxide capture technology based on chemical gas-liquid absorption using alkanolamine solutions.
71 citations
TL;DR: The tools established here to estimate rheology and mass transfer during the T. reesei growth phase could be used in the future for cost estimation and process optimisation, and the use of model fluids is a good way to investigate hydrodynamics andmass transfer inside large mock-ups.
71 citations