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 paper, a model for a spiral-wound reverse osmosis system using the three-parameter membrane transport model by Spiegler-Kedem is presented, where the pressure drops in the permeate channel, feed channel and also the variation of the mass transfer coefficient along the feed channel were taken into account.
90 citations
TL;DR: In this paper, the authors studied the flooding and mass transfer characteristics of a rotating packed bed (RPB) incorporating the split packing design innovation, and compared the results with existing literature data on packed columns and conventional HiGee to evaluate the process intensification potential.
Abstract: The flooding and mass transfer characteristics of a rotating packed bed (RPB) incorporating the split packing design innovation is studied. The air−water system is used for characterizing the flooding behavior, while mass transfer is studied for the chemisorption of CO2 in aqueous NaOH. Danckwert’s chemical method is used to infer the effective specific interfacial area (ae) for mass transfer. The variation in the liquid side volumetric mass transfer coefficient (kLae) with operating conditions is also measured. Consistently higher values of ae and kLae are observed for counter-rotation of the adjacent packing rings compared to co-rotation. The flooding and mass transfer results are compared with existing literature data on packed columns and conventional HiGee to evaluate the process intensification potential of the novel HiGee. The flooding limits are comparable to conventional HiGee, while the reported ae and kLae values are higher.
90 citations
TL;DR: In this paper, the adsorption and photocatalysis kinetics of metsulfuron-methyl (MM) onto titanium oxide (TiO2) and powdered activated carbon (PAC) were studied at varying adsorbent amount and MM concentration.
90 citations
01 Jan 1986
TL;DR: In this article, an equation for predicting heat transfer coefficients for nucleate boiling of mixtures is derived, which contains only one adjustable parameter and the liquid-phase mass transfer coefficient.
Abstract: An equation for predicting heat transfer coefficients for nucleate boiling of mixtures is derived. This expression contains only one adjustable parameter and the liquid-phase mass transfer coefficient. If the adjustable parameter is put equal to unity, comparison with the most recent data for the SF/sub 6/-CF/sub 2/-Cl/sub 2/ system gives a mass transfer coefficient of 2 X 10/sup -4/ m/s, which is of the same order of magnitude as the value obtained in physical and chemical absorption and in fallingfilm vaporization. The new equation corresponds particularly well with the experimental observation that the heat transfer coefficient is less dependent on the heat flux density and the pressure for nucleate boiling of mixtures than in the case of the pure components.
90 citations
TL;DR: In this article, the gas holdup e and the volumetric liquid-phase mass transfer coefficient kLa were studied experimentally in a bubble column with a draught tube and with gas dispersion into the tube.
Abstract: The gas holdup e and the volumetric liquid-phase mass transfer coefficient kLa were studied experimentally in a bubble column with a draught tube and with gas dispersion into the tube. From experimental observation e increases with increasing gas velocity and frothing ability of liquid, while the other properties of the liquid and the column dimensions have a minor effect on e. kLa increases with gas velocity, column diameter, frothing ability of liquid and diffusivity of the dissolved gas, and decreases with increase in (Di/Do). Other dimensions of the column have a minor effect on kLa. Based on these observations, empirical equations for e and kLa are proposed which are applicable to columns with diameters of 0.1-0.3 m. At the same gas velocity, kLa in this column is larger than that in the bubble column and smaller than that in the column with a draught tube and with gas dispersion into the annulus for a liquid with frothing ability.
90 citations