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, pendular rings are observed dissolving in an artificial porous medium consisting of a single layer of glass beads, given the simple geometry of the droplets, porescale mass transfer coefficients are calculated.
73 citations
01 Jan 1983
TL;DR: In a large number of relevant industrial processes, gases are generated by electrochemical reactions Processes linked to the evolution of gas exhibit some characteristics which are not typical of electrode processes in general Gas bubbles develop at bubble nuclei, grow in size, finally break off and rise in the liquid, thus providing a locally nonsteady state condition.
Abstract: In a large number of relevant industrial processes, gases are generated by electrochemical reactions Processes linked to the evolution of gas exhibit some characteristics which are not typical of electrode processes in general Gas bubbles develop at bubble nuclei, grow in size, finally break off, and rise in the liquid, thus providing a locally nonsteady-state condition A detailed knowledge of the events at gas-evolving electrodes is necessary for a quantitative treatment of mass transfer and, closely connected with it, of heat transfer On the other hand, charge transport within bubble-filled electrolytes is of considerable practical interest These three aspects form the main subject matter of this chapter
73 citations
TL;DR: In this article, two commercial asymmetric porous membranes are tested to model the vapour transport across the membrane, and both diffusion models underestimate the membrane permeability to water vapour.
73 citations
TL;DR: In this article, the effect of operating conditions such as feed temperature, feed circulation rate and feed inlet concentration on permeate flux in a direct contact membrane distillation (DCMD) have been simulated.
Abstract: Effect of operating conditions such as feed temperature, feed circulation rate and feed inlet concentration on permeate flux in a direct contact membrane distillation (DCMD) have been simulated. The effects of these parameters on both temperature and concentration polarizations have also been taken into account. A simultaneous heat and mass transfer model has been used in the DCMD system. The model has been solved numerically using MATLAB. Significances of the heat transfer due to mass flux, heat lost by conduction, as well as their contribution to the overall heat flux through the membrane have been determined. The variation of physical and flow properties with temperature and consequently heat transfer coefficients have been considered in this study. The influence of mass transfer on heat transfer coefficients and heat transfer rates has been considered in heat transfer equations. Finally, the simultaneously effects of the operating parameters on response variables have been studied.
73 citations
TL;DR: In this paper, the horizontal connection length and A d /A r were major parameters which strongly affected the performance of external-loop air-laboration reactors, and useful correlations were obtained for gas holdups, the volumetric mass transfer coefficient, the circulation liquid velocity, and the mixing time.
Abstract: The effects of the horizontal connection length (0.1≤L c ≤0.5 m), the cross-sectional area ratio of downcomer-to-riser (0.11≤A d /A r ≤0.53), and the superficial gas velocity on gas phase holdups in the riser and downcomer were studied. The circulation liquid velocity, the mixing performance and the volumetric mass transfer coefficient in the external-loop airlift reactors were also measured. The horizontal connection length and A d /A r were major parameters which strongly affected the performance of external-loop airlift reactors. Useful correlations in the external-loop airlift reactors were obtained for gas holdups, the volumetric mass transfer coefficient, the circulation liquid velocity, and the mixing time
72 citations